/*
 * Copyright (C) 2005-2007 Alfresco Software Limited.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */
package org.alfresco.repo.jscript;

import java.io.InputStream;
import java.io.Serializable;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;

import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.model.ApplicationModel;
import org.alfresco.model.ContentModel;
import org.alfresco.repo.action.executer.TransformActionExecuter;
import org.alfresco.repo.content.transform.magick.ImageTransformationOptions;
import org.alfresco.repo.search.QueryParameterDefImpl;
import org.alfresco.repo.version.VersionModel;
import org.alfresco.service.ServiceRegistry;
import org.alfresco.service.cmr.dictionary.DataTypeDefinition;
import org.alfresco.service.cmr.dictionary.DictionaryService;
import org.alfresco.service.cmr.lock.LockStatus;
import org.alfresco.service.cmr.model.FileExistsException;
import org.alfresco.service.cmr.model.FileInfo;
import org.alfresco.service.cmr.model.FileNotFoundException;
import org.alfresco.service.cmr.repository.AssociationRef;
import org.alfresco.service.cmr.repository.ChildAssociationRef;
import org.alfresco.service.cmr.repository.ContentData;
import org.alfresco.service.cmr.repository.ContentReader;
import org.alfresco.service.cmr.repository.ContentService;
import org.alfresco.service.cmr.repository.ContentWriter;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.cmr.repository.StoreRef;
import org.alfresco.service.cmr.repository.TemplateImageResolver;
import org.alfresco.service.cmr.search.QueryParameterDefinition;
import org.alfresco.service.cmr.security.AccessPermission;
import org.alfresco.service.cmr.security.AccessStatus;
import org.alfresco.service.cmr.security.PermissionService;
import org.alfresco.service.cmr.version.Version;
import org.alfresco.service.cmr.version.VersionType;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;
import org.alfresco.service.namespace.RegexQNamePattern;
import org.alfresco.util.Content;
import org.alfresco.util.GUID;
import org.alfresco.util.ParameterCheck;
import org.alfresco.util.URLEncoder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.UniqueTag;
import org.mozilla.javascript.Wrapper;

/**
 * Node class implementation, specific for use by ScriptService as part of the object model.
 * <p>
 * The class exposes Node properties, children and assocs as dynamically populated maps and lists. The various collection classes are mirrored as JavaScript properties. So can be
 * accessed using standard JavaScript property syntax, such as <code>node.children[0].properties.name</code>.
 * <p>
 * Various helper methods are provided to access common and useful node variables such as the content url and type information.
 * 
 * @author Kevin Roast
 */
public class ScriptNode implements Serializable, Scopeable
{
    private static final long serialVersionUID = -3378946227712939600L;
    
    private static Log logger = LogFactory.getLog(ScriptNode.class);
    
    private final static String NAMESPACE_BEGIN = "" + QName.NAMESPACE_BEGIN;
    
    private final static String CONTENT_DEFAULT_URL = "/d/d/{0}/{1}/{2}/{3}";
    private final static String CONTENT_DOWNLOAD_URL = "/d/a/{0}/{1}/{2}/{3}";
    private final static String CONTENT_PROP_URL = "/d/d/{0}/{1}/{2}/{3}?property={4}";
    private final static String CONTENT_DOWNLOAD_PROP_URL = "/d/a/{0}/{1}/{2}/{3}?property={4}";
    private final static String FOLDER_BROWSE_URL = "/n/browse/{0}/{1}/{2}";
    
    /** Root scope for this object */
    protected Scriptable scope;
    
    /** Node Value Converter */
    protected NodeValueConverter converter = null;
    
    /** Cached values */
    protected NodeRef nodeRef;
    private String name;
    private QName type;
    protected String id;
    
    /** The aspects applied to this node */
    protected Set<QName> aspects = null;
    
    /** The target associations from this node */
    private ScriptableQNameMap<String, Object> targetAssocs = null;
    
    /** The source assoications to this node */
    private ScriptableQNameMap<String, Object> sourceAssocs = null;
    
    /** The child associations for this node */
    private ScriptableQNameMap<String, Object> childAssocs = null;
    
    /** The children of this node */
    private Scriptable children = null;
    
    /** The properties of this node */
    private ScriptableQNameMap<String, Serializable> properties = null;
    
    protected ServiceRegistry services = null;
    private NodeService nodeService = null;
    private Boolean isDocument = null;
    private Boolean isContainer = null;
    private Boolean isLinkToDocument = null;
    private Boolean isLinkToContainer = null;
    private String displayPath = null;
    protected TemplateImageResolver imageResolver = null;
    protected ScriptNode parent = null;
    private ChildAssociationRef primaryParentAssoc = null;
    // NOTE: see the reset() method when adding new cached members!
    
    
    // ------------------------------------------------------------------------------
    // Construction
    
    /**
     * Constructor
     * 
     * @param nodeRef   The NodeRef this Node wrapper represents
     * @param services  The ServiceRegistry the Node can use to access services
     * @param resolver  Image resolver to use to retrieve icons
     */
    public ScriptNode(NodeRef nodeRef, ServiceRegistry services)
    {
        this(nodeRef, services, null);
    }
    
    /**
     * Constructor
     * 
     * @param nodeRef   The NodeRef this Node wrapper represents
     * @param services  The ServiceRegistry the Node can use to access services
     * @param resolver  Image resolver to use to retrieve icons
     * @param scope     Root scope for this Node
     */
    public ScriptNode(NodeRef nodeRef, ServiceRegistry services, Scriptable scope)
    {
        if (nodeRef == null)
        {
            throw new IllegalArgumentException("NodeRef must be supplied.");
        }
        
        if (services == null)
        {
            throw new IllegalArgumentException("The ServiceRegistry must be supplied.");
        }
        
        this.nodeRef = nodeRef;
        this.id = nodeRef.getId();
        this.services = services;
        this.nodeService = services.getNodeService();
        this.scope = scope;
    }
    
    @Override
    public int hashCode()
    {
        final int PRIME = 31;
        int result = 1;
        result = PRIME * result + ((nodeRef == null) ? 0 : nodeRef.hashCode());
        return result;
    }
    
    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) return true;
        if (obj == null) return false;
        if (getClass() != obj.getClass()) return false;
        if (!nodeRef.equals(((ScriptNode)obj).nodeRef)) return false;
        return true;
    }
    
    /**
     * Factory method
     */
    public ScriptNode newInstance(NodeRef nodeRef, ServiceRegistry services, Scriptable scope)
    {
        return new ScriptNode(nodeRef, services, scope);
    }
    
    /**
     * @see org.alfresco.repo.jscript.Scopeable#setScope(org.mozilla.javascript.Scriptable)
     */
    public void setScope(Scriptable scope)
    {
        this.scope = scope;
    }
    
    
    // ------------------------------------------------------------------------------
    // Node Wrapper API
    
    /**
     * @return The GUID for the node
     */
    public String getId()
    {
        return this.id;
    }
    
    /**
     * @return Returns the NodeRef this Node object represents
     */
    public NodeRef getNodeRef()
    {
        return this.nodeRef;
    }
    
    /**
     * @return Returns the QName type.
     */
    public QName getQNameType()
    {
        if (this.type == null)
        {
            this.type = this.nodeService.getType(this.nodeRef);
        }
        
        return type;
    }
    
    /**
     * @return Returns the type.
     */
    public String getType()
    {
        return getQNameType().toString();
    }
    
    /**
     * @return Helper to return the 'name' property for the node
     */
    public String getName()
    {
        if (this.name == null)
        {
            // try and get the name from the properties first
            this.name = (String) getProperties().get("cm:name");
            
            // if we didn't find it as a property get the name from the association name
            if (this.name == null)
            {
                ChildAssociationRef parentRef = this.nodeService.getPrimaryParent(this.nodeRef);
                if (parentRef != null && parentRef.getQName() != null)
                {
                    this.name = parentRef.getQName().getLocalName();
                }
                else
                {
                    this.name = "";
                }
            }
        }
        
        return this.name;
    }
    
    /**
     * Helper to set the 'name' property for the node.
     * 
     * @param name Name to set
     */
    public void setName(String name)
    {
        if (name != null)
        {
            QName typeQName = getQNameType();
            if ((services.getDictionaryService().isSubClass(typeQName, ContentModel.TYPE_FOLDER) &&
                 !services.getDictionaryService().isSubClass(typeQName, ContentModel.TYPE_SYSTEM_FOLDER)) ||
                 services.getDictionaryService().isSubClass(typeQName, ContentModel.TYPE_CONTENT))
            {
                try
                {
                   this.services.getFileFolderService().rename(this.nodeRef, name);
                }
                catch (FileExistsException e)
                {
                    throw new AlfrescoRuntimeException("Failed to rename node " + nodeRef + " to " + name, e);
                }
                catch (FileNotFoundException e)
                {
                    throw new AlfrescoRuntimeException("Failed to rename node " + nodeRef + " to " + name, e);
                }
            }
            this.getProperties().put(ContentModel.PROP_NAME.toString(), name.toString());
        }
    }
    
    /**
     * @return The children of this Node as JavaScript array of Node object wrappers
     */
    public Scriptable getChildren()
    {
        if (this.children == null)
        {
            List<ChildAssociationRef> childRefs = this.nodeService.getChildAssocs(this.nodeRef);
            Object[] children = new Object[childRefs.size()];
            for (int i = 0; i < childRefs.size(); i++)
            {
                // create our Node representation from the NodeRef
                children[i] = newInstance(childRefs.get(i).getChildRef(), this.services, this.scope);
            }
            this.children = Context.getCurrentContext().newArray(this.scope, children);
        }
        
        return this.children;
    }
    
    /**
     * @return Returns the Node at the specified 'cm:name' based Path walking the children of this Node.
     *         So a valid call might be:
     *         <code>mynode.childByNamePath("/QA/Testing/Docs");</code>
     */
    public ScriptNode childByNamePath(String path)
    {
        // convert the name based path to a valid XPath query
        StringBuilder xpath = new StringBuilder(path.length() << 1);
        StringTokenizer t = new StringTokenizer(path, "/");
        int count = 0;
        QueryParameterDefinition[] params = new QueryParameterDefinition[t.countTokens()];
        DataTypeDefinition ddText =
            this.services.getDictionaryService().getDataType(DataTypeDefinition.TEXT);
        NamespaceService ns = this.services.getNamespaceService();
        while (t.hasMoreTokens())
        {
            if (xpath.length() != 0)
            {
                xpath.append('/');
            }
            String strCount = Integer.toString(count);
            xpath.append("*[@cm:name=$cm:name")
                 .append(strCount)
                 .append(']');
            params[count++] = new QueryParameterDefImpl(
                    QName.createQName(NamespaceService.CONTENT_MODEL_PREFIX, "name" + strCount, ns),
                    ddText,
                    true,
                    t.nextToken());
        }
        
        Object[] nodes = getChildrenByXPath(xpath.toString(), params, true);
        
        return (nodes.length != 0) ? (ScriptNode)nodes[0] : null;
    }
    
    /**
     * @return Returns a JavaScript array of Nodes at the specified XPath starting at this Node.
     *         So a valid call might be <code>mynode.childrenByXPath("*[@cm:name='Testing']/*");</code>
     */
    public Scriptable childrenByXPath(String xpath)
    {
        return Context.getCurrentContext().newArray(this.scope, getChildrenByXPath(xpath, null, false));
    }
    
    /**
     * Return the target associations from this Node. As a Map of assoc name to a JavaScript array of Nodes.
     * The Map returned implements the Scriptable interface to allow access to the assoc arrays via JavaScript
     * associative array access. This means associations of this node can be access thus:
     * <code>node.assocs["translations"][0]</code>
     * 
     * @return target associations as a Map of assoc name to a JavaScript array of Nodes.
     */
    @SuppressWarnings("unchecked")
    public Map<String, Object> getAssocs()
    {
        if (this.targetAssocs == null)
        {
            // this Map implements the Scriptable interface for native JS syntax property access
            this.targetAssocs = new ScriptableQNameMap<String, Object>(this.services.getNamespaceService());

            // get the list of target nodes for each association type
            List<AssociationRef> refs = this.nodeService.getTargetAssocs(this.nodeRef, RegexQNamePattern.MATCH_ALL);
            for (AssociationRef ref : refs)
            {
                String qname = ref.getTypeQName().toString();
                List<ScriptNode> nodes = (List<ScriptNode>)this.targetAssocs.get(qname);
                if (nodes == null)
                {
                    // first access of the list for this qname
                    nodes = new ArrayList<ScriptNode>(4);
                    this.targetAssocs.put(ref.getTypeQName().toString(), nodes);
                }
                nodes.add(newInstance(ref.getTargetRef(), this.services, this.scope));
            }
            
            // convert each Node list into a JavaScript array object
            for (String qname : this.targetAssocs.keySet())
            {
                List<ScriptNode> nodes = (List<ScriptNode>)this.targetAssocs.get(qname);
                Object[] objs = nodes.toArray(new Object[nodes.size()]);
                this.targetAssocs.put(qname, Context.getCurrentContext().newArray(this.scope, objs));
            }
        }

        return this.targetAssocs;
    }
    
    public Map<String, Object> getAssociations()
    {
        return getAssocs();
    }
    
    /**
     * Return the source associations to this Node. As a Map of assoc name to a JavaScript array of Nodes.
     * The Map returned implements the Scriptable interface to allow access to the assoc arrays via JavaScript
     * associative array access. This means source associations to this node can be access thus:
     * <code>node.sourceAssocs["translations"][0]</code>
     * 
     * @return source associations as a Map of assoc name to a JavaScript array of Nodes.
     */
    @SuppressWarnings("unchecked")
    public Map<String, Object> getSourceAssocs()
    {
        if (this.sourceAssocs == null)
        {
            // this Map implements the Scriptable interface for native JS syntax property access
            this.sourceAssocs = new ScriptableQNameMap<String, Object>(this.services.getNamespaceService());

            // get the list of source nodes for each association type
            List<AssociationRef> refs = this.nodeService.getSourceAssocs(this.nodeRef, RegexQNamePattern.MATCH_ALL);
            for (AssociationRef ref : refs)
            {
                String qname = ref.getTypeQName().toString();
                List<ScriptNode> nodes = (List<ScriptNode>)this.sourceAssocs.get(qname);
                if (nodes == null)
                {
                    // first access of the list for this qname
                    nodes = new ArrayList<ScriptNode>(4);
                    this.sourceAssocs.put(ref.getTypeQName().toString(), nodes);
                }
                nodes.add(newInstance(ref.getSourceRef(), this.services, this.scope));
            }
            
            // convert each Node list into a JavaScript array object
            for (String qname : this.sourceAssocs.keySet())
            {
                List<ScriptNode> nodes = (List<ScriptNode>)this.sourceAssocs.get(qname);
                Object[] objs = nodes.toArray(new Object[nodes.size()]);
                this.sourceAssocs.put(qname, Context.getCurrentContext().newArray(this.scope, objs));
            }
        }
        
        return this.sourceAssocs;
    }
    
    public Map<String, Object> getSourceAssociations()
    {
        return getSourceAssocs();
    }
    
    /**
     * Return the child associations from this Node. As a Map of assoc name to a JavaScript array of Nodes.
     * The Map returned implements the Scriptable interface to allow access to the assoc arrays via JavaScript
     * associative array access. This means associations of this node can be access thus:
     * <code>node.childAssocs["contains"][0]</code>
     * 
     * @return child associations as a Map of assoc name to a JavaScript array of Nodes.
     */
    @SuppressWarnings("unchecked")
    public Map<String, Object> getChildAssocs()
    {
        if (this.childAssocs == null)
        {
            // this Map implements the Scriptable interface for native JS syntax property access
            this.childAssocs = new ScriptableQNameMap<String, Object>(this.services.getNamespaceService());
            
            // get the list of child assoc nodes for each association type
            List<ChildAssociationRef> refs = this.nodeService.getChildAssocs(nodeRef);
            for (ChildAssociationRef ref : refs)
            {
                String qname = ref.getTypeQName().toString();
                List<ScriptNode> nodes = (List<ScriptNode>)this.childAssocs.get(qname);
                if (nodes == null)
                {
                    // first access of the list for this qname
                    nodes = new ArrayList<ScriptNode>(4);
                    this.childAssocs.put(ref.getTypeQName().toString(), nodes);
                }
                nodes.add(newInstance(ref.getChildRef(), this.services, this.scope));
            }
            
            // convert each Node list into a JavaScript array object
            for (String qname : this.childAssocs.keySet())
            {
                List<ScriptNode> nodes = (List<ScriptNode>)this.childAssocs.get(qname);
                Object[] objs = nodes.toArray(new Object[nodes.size()]);
                this.childAssocs.put(qname, Context.getCurrentContext().newArray(this.scope, objs));
            }
        }
        
        return this.childAssocs;
    }
    
    public Map<String, Object> getChildAssociations()
    {
        return getChildAssocs();
    }
    
    /**
     * Return all the properties known about this node. The Map returned implements the Scriptable interface to
     * allow access to the properties via JavaScript associative array access. This means properties of a node can
     * be access thus: <code>node.properties["name"]</code>
     * 
     * @return Map of properties for this Node.
     */
    @SuppressWarnings("unchecked")
    public Map<String, Object> getProperties()
    {
        if (this.properties == null)
        {
            // this Map implements the Scriptable interface for native JS syntax property access
            // this impl of the QNameMap is capable of creating ScriptContentData on demand for 'cm:content'
            // properties that have not been initialised - see AR-1673.
            this.properties = new ContentAwareScriptableQNameMap<String, Serializable>(this, this.services);
            
            Map<QName, Serializable> props = this.nodeService.getProperties(this.nodeRef);
            for (QName qname : props.keySet())
            {
                Serializable propValue = props.get(qname);
                
                // perform the conversion to a script safe value and store
                this.properties.put(qname.toString(), getValueConverter().convertValueForScript(qname, propValue));
            }
        }
        
        return this.properties;
    }
    
    /**
     * @return true if this Node is a container (i.e. a folder)
     */
    public boolean getIsContainer()
    {
        if (isContainer == null)
        {
            DictionaryService dd = this.services.getDictionaryService();
            isContainer = Boolean.valueOf((dd.isSubClass(getQNameType(), ContentModel.TYPE_FOLDER) == true &&
                    dd.isSubClass(getQNameType(), ContentModel.TYPE_SYSTEM_FOLDER) == false));
        }
        
        return isContainer.booleanValue();
    }
    
    /**
     * @return true if this Node is a Document (i.e. with content)
     */
    public boolean getIsDocument()
    {
        if (isDocument == null)
        {
            DictionaryService dd = this.services.getDictionaryService();
            isDocument = Boolean.valueOf(dd.isSubClass(getQNameType(), ContentModel.TYPE_CONTENT));
        }
        
        return isDocument.booleanValue();
    }
    
    /**
     * @return true if this Node is a Link to a Container (i.e. a folderlink)
     */
    public boolean getIsLinkToContainer()
    {
        if (isLinkToContainer == null)
        {
            DictionaryService dd = this.services.getDictionaryService();
            isLinkToContainer = Boolean.valueOf(dd.isSubClass(getQNameType(), ApplicationModel.TYPE_FOLDERLINK));
        }
        
        return isLinkToContainer.booleanValue();
    }

    /**
     * @return true if this Node is a Link to a Document (i.e. a filelink)
     */
    public boolean getIsLinkToDocument()
    {
        if (isLinkToDocument == null)
        {
            DictionaryService dd = this.services.getDictionaryService();
            isLinkToDocument = Boolean.valueOf(dd.isSubClass(getQNameType(), ApplicationModel.TYPE_FILELINK));
        }
        
        return isLinkToDocument.booleanValue();
    }

    /**
     * @return true if the Node is a Category
     */
    public boolean getIsCategory()
    {
        // this valid is overriden by the CategoryNode sub-class
        return false;
    }
    
    /**
     * @return The list of aspects applied to this node
     */
    public Set<QName> getAspectsSet()
    {
        if (this.aspects == null)
        {
            this.aspects = this.nodeService.getAspects(this.nodeRef);
        }
        
        return this.aspects;
    }
    
    /**
     * @return The array of aspects applied to this node
     */
    public Scriptable getAspects()
    {
        Set<QName> aspects = getAspectsSet();
        String[] result = new String[aspects.size()];
        int count = 0;
        for (QName qname : aspects)
        {
            result[count++] = qname.toString();
        }
        return Context.getCurrentContext().newArray(this.scope, result);
    }
    
    /**
     * @param aspect  The aspect name to test for (full qualified or short-name form)
     * @return true if the node has the aspect false otherwise
     */
    public boolean hasAspect(String aspect)
    {
        return getAspectsSet().contains(createQName(aspect));
    }
    
    /**
     * @return QName path to this node. This can be used for Lucene PATH: style queries
     */
    public String getQnamePath()
    {
        return this.services.getNodeService().getPath(getNodeRef()).toPrefixString(this.services.getNamespaceService());
    }

    /**
     * @return Display path to this node
     */
    public String getDisplayPath()
    {
        if (displayPath == null)
        {
            displayPath = this.nodeService.getPath(this.nodeRef).toDisplayPath(
                    this.nodeService, this.services.getPermissionService());
        }
        
        return displayPath;
    }
    
    /**
     * @return the small icon image for this node
     */
    public String getIcon16()
    {
        return "/images/filetypes/_default.gif";
    }
    
    /**
     * @return the large icon image for this node
     */
    public String getIcon32()
    {
        return "/images/filetypes32/_default.gif";
    }
    
    /**
     * @return true if the node is currently locked
     */
    public boolean getIsLocked()
    {
        boolean locked = false;
        
        if (getAspectsSet().contains(ContentModel.ASPECT_LOCKABLE))
        {
            LockStatus lockStatus = this.services.getLockService().getLockStatus(this.nodeRef);
            if (lockStatus == LockStatus.LOCKED || lockStatus == LockStatus.LOCK_OWNER)
            {
                locked = true;
            }
        }
        
        return locked;
    }
    
    /**
     * @return the parent node
     */
    public ScriptNode getParent()
    {
        if (parent == null)
        {
            NodeRef parentRef = getPrimaryParentAssoc().getParentRef();
            // handle root node (no parent!)
            if (parentRef != null)
            {
                parent = newInstance(parentRef, this.services, this.scope);
            }
        }
        
        return parent;
    }
    
    /**
     * @return the primary parent association so we can get at the association QName and the association type QName.
     */
    public ChildAssociationRef getPrimaryParentAssoc()
    {
        if (primaryParentAssoc == null)
        {
            primaryParentAssoc = this.nodeService.getPrimaryParent(nodeRef);
        }
        return primaryParentAssoc;
    }
    
    
    // ------------------------------------------------------------------------------
    // Content API
    
    /**
     * @return the content String for this node from the default content property (@see ContentModel.PROP_CONTENT)
     */
    public String getContent()
    {
        String content = "";
        
        ScriptContentData contentData = (ScriptContentData)getProperties().get(ContentModel.PROP_CONTENT);
        if (contentData != null)
        {
            content = contentData.getContent();
        }
        
        return content;
    }
    
    /**
     * Set the content for this node
     * 
     * @param content    Content string to set
     */
    public void setContent(String content)
    {
        ScriptContentData contentData = (ScriptContentData)getProperties().get(ContentModel.PROP_CONTENT);
        if (contentData != null)
        {
            contentData.setContent(content);
        }
    }
    
    /**
     * @return For a content document, this method returns the URL to the content stream for the default content
     *         property (@see ContentModel.PROP_CONTENT)
     *         <p>
     *         For a container node, this method return the URL to browse to the folder in the web-client
     */
    public String getUrl()
    {
        if (getIsDocument() == true)
        {
            return MessageFormat.format(CONTENT_DEFAULT_URL, new Object[] { nodeRef.getStoreRef().getProtocol(),
                    nodeRef.getStoreRef().getIdentifier(), nodeRef.getId(),
                    URLEncoder.encode(getName())});
        }
        else
        {
            return MessageFormat.format(FOLDER_BROWSE_URL, new Object[] { nodeRef.getStoreRef().getProtocol(),
                    nodeRef.getStoreRef().getIdentifier(), nodeRef.getId() });
        }
    }
    
    /**
     * @return For a content document, this method returns the download URL to the content for
     *         the default content property (@see ContentModel.PROP_CONTENT)
     *         <p>
     *         For a container node, this method returns an empty string
     */
    public String getDownloadUrl()
    {
        if (getIsDocument() == true)
        {
           return MessageFormat.format(CONTENT_DOWNLOAD_URL, new Object[] {
                    nodeRef.getStoreRef().getProtocol(),
                    nodeRef.getStoreRef().getIdentifier(),
                    nodeRef.getId(),
                    URLEncoder.encode(getName()) });
        }
        else
        {
            return "";
        }
    }

    public String jsGet_downloadUrl()
    {
        return getDownloadUrl();
    }
    
    /**
     * @return The WebDav cm:name based path to the content for the default content property
     *         (@see ContentModel.PROP_CONTENT)
     */
    public String getWebdavUrl()
    {
        try
        {
            List<FileInfo> paths = this.services.getFileFolderService().getNamePath(null, getNodeRef());
            
            // build up the webdav url
            StringBuilder path = new StringBuilder(128);
            path.append("/webdav");
            
            // build up the path skipping the first path as it is the root folder
            for (int i=1; i<paths.size(); i++)
            {
                path.append("/")
                    .append(URLEncoder.encode(paths.get(i).getName()));
            }
            return path.toString();
        }
        catch (FileNotFoundException nodeErr)
        {
            // cannot build path if file no longer exists
            return "";
        }
    }

    /**
     * @return The mimetype encoding for content attached to the node from the default content property
     *         (@see ContentModel.PROP_CONTENT)
     */
    public String getMimetype()
    {
        String mimetype = null;
        ScriptContentData content = (ScriptContentData) this.getProperties().get(ContentModel.PROP_CONTENT);
        if (content != null)
        {
            mimetype = content.getMimetype();
        }
        
        return mimetype;
    }
    
    /**
     * Set the mimetype encoding for the content attached to the node from the default content property
     * (@see ContentModel.PROP_CONTENT)
     * 
     * @param mimetype   Mimetype to set
     */
    public void setMimetype(String mimetype)
    {
        ScriptContentData content = (ScriptContentData) this.getProperties().get(ContentModel.PROP_CONTENT);
        if (content != null)
        {
            content.setMimetype(mimetype);
        }
    }
    
    /**
     * @return The size in bytes of the content attached to the node from the default content property
     *         (@see ContentModel.PROP_CONTENT)
     */
    public long getSize()
    {
        long size = 0;
        ScriptContentData content = (ScriptContentData) this.getProperties().get(ContentModel.PROP_CONTENT);
        if (content != null)
        {
            size = content.getSize();
        }
        
        return size;
    }
    
    
    // ------------------------------------------------------------------------------
    // Security API
    
    /**
     * Return true if the user has the specified permission on the node.
     * <p>
     * The default permissions are found in <code>org.alfresco.service.cmr.security.PermissionService</code>.
     * Most commonly used are "Write", "Delete" and "AddChildren".
     * 
     * @param permission as found in <code>org.alfresco.service.cmr.security.PermissionService</code>
     * @return true if the user has the specified permission on the node.
     */
    public boolean hasPermission(String permission)
    {
        ParameterCheck.mandatory("Permission Name", permission);
        
        boolean allowed = false;
        
        if (permission != null && permission.length() != 0)
        {
            AccessStatus status = this.services.getPermissionService().hasPermission(this.nodeRef, permission);
            allowed = (AccessStatus.ALLOWED == status);
        }
        
        return allowed;
    }
    
    /**
     * @return Array of permissions applied to this Node.
     *         Strings returned are of the format [ALLOWED|DENIED];[USERNAME|GROUPNAME];PERMISSION for example
     *         ALLOWED;kevinr;Consumer so can be easily tokenized on the ';' character.
     */
    public Scriptable getPermissions()
    {
        String userName = this.services.getAuthenticationService().getCurrentUserName();
        Set<AccessPermission> acls = this.services.getPermissionService().getAllSetPermissions(getNodeRef());
        Object[] permissions = new Object[acls.size()];
        int count = 0;
        for (AccessPermission permission : acls)
        {
            StringBuilder buf = new StringBuilder(64);
            buf.append(permission.getAccessStatus())
                .append(';')
                .append(permission.getAuthority())
                .append(';')
                .append(permission.getPermission());
            permissions[count++] = buf.toString();
        }
        return Context.getCurrentContext().newArray(this.scope, permissions);
    }
    
    /**
     * @return true if the node inherits permissions from the parent node, false otherwise
     */
    public boolean inheritsPermissions()
    {
        return this.services.getPermissionService().getInheritParentPermissions(this.nodeRef);
    }
    
    /**
     * Set whether this node should inherit permissions from the parent node.
     * 
     * @param inherit True to inherit parent permissions, false otherwise.
     */
    public void setInheritsPermissions(boolean inherit)
    {
        this.services.getPermissionService().setInheritParentPermissions(this.nodeRef, inherit);
    }
    
    /**
     * Apply a permission for ALL users to the node.
     * 
     * @param permission Permission to apply
     * @see org.alfresco.service.cmr.security.PermissionService
     */
    public void setPermission(String permission)
    {
        ParameterCheck.mandatoryString("Permission Name", permission);
        this.services.getPermissionService().setPermission(
                this.nodeRef, PermissionService.ALL_AUTHORITIES, permission, true);
    }
    
    /**
     * Apply a permission for the specified authority (e.g. username or group) to the node.
     * 
     * @param permission Permission to apply @see org.alfresco.service.cmr.security.PermissionService
     * @param authority Authority (generally a username or group name) to apply the permission for
     */
    public void setPermission(String permission, String authority)
    {
        ParameterCheck.mandatoryString("Permission Name", permission);
        ParameterCheck.mandatoryString("Authority", authority);
        this.services.getPermissionService().setPermission(
                this.nodeRef, authority, permission, true);
    }
    
    /**
     * Remove a permission for ALL user from the node.
     * 
     * @param permission Permission to remove @see org.alfresco.service.cmr.security.PermissionService
     */
    public void removePermission(String permission)
    {
        ParameterCheck.mandatoryString("Permission Name", permission);
        this.services.getPermissionService().deletePermission(
                this.nodeRef, PermissionService.ALL_AUTHORITIES, permission);
    }
    
    /**
     * Remove a permission for the specified authority (e.g. username or group) from the node.
     * 
     * @param permission Permission to remove @see org.alfresco.service.cmr.security.PermissionService
     * @param authority  Authority (generally a username or group name) to apply the permission for
     */
    public void removePermission(String permission, String authority)
    {
        ParameterCheck.mandatoryString("Permission Name", permission);
        ParameterCheck.mandatoryString("Authority", authority);
        this.services.getPermissionService().deletePermission(
                this.nodeRef, authority, permission);
    }
    
    
    // ------------------------------------------------------------------------------
    // Ownership API
    
    /**
     * Set the owner of the node
     */
    public void setOwner(String userId)
    {
        this.services.getOwnableService().setOwner(this.nodeRef, userId);
    }
    
    /**
     * Take ownership of the node.
     */
    public void takeOwnership()
    {
        this.services.getOwnableService().takeOwnership(this.nodeRef);
    }
    
    /**
     * Get the owner of the node.
     * 
     * @return
     */
    public String getOwner()
    {
        return this.services.getOwnableService().getOwner(this.nodeRef);
    }
    
    
    // ------------------------------------------------------------------------------
    // Create and Modify API
    
    /**
     * Persist the modified properties of this Node.
     */
    public void save()
    {
        // persist properties back to the node in the DB
        Map<QName, Serializable> props = new HashMap<QName, Serializable>(getProperties().size());
        for (String key : this.properties.keySet())
        {
            Serializable value = (Serializable) this.properties.get(key);
            
            // perform the conversion from script wrapper object to repo serializable values
            value = getValueConverter().convertValueForRepo(value);
            
            props.put(createQName(key), value);
        }
        this.nodeService.setProperties(this.nodeRef, props);
    }
    
    /**
     * Re-sets the type of the node. Can be called in order specialise a node to a sub-type. This should be used
     * with caution since calling it changes the type of the node and thus* implies a different set of aspects,
     * properties and associations. It is the responsibility of the caller to ensure that the node is in a
     * approriate state after changing the type.
     * 
     * @param type Type to specialize the node
     * 
     * @return true if successful, false otherwise
     */
    public boolean specializeType(String type)
    {
        ParameterCheck.mandatoryString("Type", type);
        
        QName qnameType = createQName(type);
        
        // Ensure that we are performing a specialise
        if (getQNameType().equals(qnameType) == false &&
                this.services.getDictionaryService().isSubClass(qnameType, getQNameType()) == true)
        {
            // Specialise the type of the node
            this.nodeService.setType(this.nodeRef, qnameType);
            this.type = qnameType;
            
            return true;
        }
        return false;
    }
    
    /**
     * Create a new File (cm:content) node as a child of this node.
     * <p>
     * Once created the file should have content set using the <code>content</code> property.
     * 
     * @param name Name of the file to create
     * 
     * @return Newly created Node or null if failed to create.
     */
    public ScriptNode createFile(String name)
    {
        ParameterCheck.mandatoryString("Node Name", name);
        
        FileInfo fileInfo = this.services.getFileFolderService().create(
                this.nodeRef, name, ContentModel.TYPE_CONTENT);
        
        reset();
        
        ScriptNode file = newInstance(fileInfo.getNodeRef(), this.services, this.scope);
        file.setMimetype(this.services.getMimetypeService().guessMimetype(name));
        
        return file;
    }
    
    /**
     * Create a new folder (cm:folder) node as a child of this node.
     * 
     * @param name Name of the folder to create
     * 
     * @return Newly created Node or null if failed to create.
     */
    public ScriptNode createFolder(String name)
    {
        ParameterCheck.mandatoryString("Node Name", name);
        
        FileInfo fileInfo = this.services.getFileFolderService().create(
                this.nodeRef, name, ContentModel.TYPE_FOLDER);
        
        reset();
        
        return newInstance(fileInfo.getNodeRef(), this.services, this.scope);
    }
    
    /**
     * Create a new Node of the specified type as a child of this node.
     * 
     * @param name Name of the node to create (can be null for a node without a 'cm:name' property)
     * @param type QName type (fully qualified or short form such as 'cm:content')
     * 
     * @return Newly created Node or null if failed to create.
     */
    public ScriptNode createNode(String name, String type)
    {
        return createNode(name, type, null, ContentModel.ASSOC_CONTAINS.toString());
    }
    
    /**
     * Create a new Node of the specified type as a child of this node.
     * 
     * @param name Name of the node to create (can be null for a node without a 'cm:name' property)
     * @param type QName type (fully qualified or short form such as 'cm:content')
     * @param assocName QName of the child association (fully qualified or short form e.g. 'cm:contains')
     * 
     * @return Newly created Node or null if failed to create.
     */
    public ScriptNode createNode(String name, String type, String assocName)
    {
        return createNode(name, type, null, assocName);
    }
    
    /**
     * Create a new Node of the specified type as a child of this node.
     * 
     * @param name Name of the node to create (can be null for a node without a 'cm:name' property)
     * @param type QName type (fully qualified or short form such as 'cm:content')
     * @param properties Associative array of the default properties for the node.
     * 
     * @return Newly created Node or null if failed to create.
     */
    public ScriptNode createNode(String name, String type, Object properties)
    {
        return createNode(name, type, properties, ContentModel.ASSOC_CONTAINS.toString());
    }
    
    /**
     * Create a new Node of the specified type as a child of this node.
     * 
     * @param name Name of the node to create (can be null for a node without a 'cm:name' property)
     * @param type QName type (fully qualified or short form such as 'cm:content')
     * @param properties Associative array of the default properties for the node.
     * @param assocName QName of the child association (fully qualified or short form e.g. 'cm:contains')
     * 
     * @return Newly created Node or null if failed to create.
     */
    public ScriptNode createNode(String name, String type, Object properties, String assocName)
    {
        ParameterCheck.mandatoryString("Node Type", type);
        ParameterCheck.mandatoryString("Association Name", assocName);
        
        Map<QName, Serializable> props = null;
        
        if (properties instanceof ScriptableObject)
        {
            props = new HashMap<QName, Serializable>(4, 1.0f);
            extractScriptableProperties((ScriptableObject)properties, props);
        }
        
        if (name != null)
        {
            if (props == null) props = new HashMap<QName, Serializable>(1, 1.0f);
            props.put(ContentModel.PROP_NAME, name);
        }
        else
        {
            // set name for the assoc local name
            name = GUID.generate();
        }
        
        ChildAssociationRef childAssocRef = this.nodeService.createNode(
                this.nodeRef, createQName(assocName),
                QName.createQName(NamespaceService.CONTENT_MODEL_1_0_URI, QName.createValidLocalName(name)),
                createQName(type), props);
        
        reset();
        
        return newInstance(childAssocRef.getChildRef(), this.services, this.scope);
    }
    
    /**
     * Add an existing node as a child of this node.
     * 
     * @param node  node to add as a child of this node
     */
    public void addNode(ScriptNode node)
    {
        ParameterCheck.mandatory("node", node);
        nodeService.addChild(this.nodeRef, node.nodeRef, ContentModel.ASSOC_CONTAINS, ContentModel.ASSOC_CONTAINS);
        reset();
    }

    /**
     * Remove an existing child node of this node.
     *
     * Severs all parent-child relationships between two nodes.
     * <p>
     * The child node will be cascade deleted if one of the associations was the
     * primary association, i.e. the one with which the child node was created.
     * 
     * @param node  child node to remove
     */
    public void removeNode(ScriptNode node)
    {
        ParameterCheck.mandatory("node", node);
        nodeService.removeChild(this.nodeRef, node.nodeRef);
        reset();
    }

    /**
     * Create an association between this node and the specified target node.
     * 
     * @param target        Destination node for the association
     * @param assocType     Association type qname (short form or fully qualified)
     */
    public void createAssociation(ScriptNode target, String assocType)
    {
        ParameterCheck.mandatory("Target", target);
        ParameterCheck.mandatoryString("Association Type Name", assocType);
        
        this.nodeService.createAssociation(this.nodeRef, target.nodeRef, createQName(assocType));
        reset();
    }
    
    /**
     * Remove an association between this node and the specified target node.
     * 
     * @param target        Destination node on the end of the association
     * @param assocType     Association type qname (short form or fully qualified)
     */
    public void removeAssociation(ScriptNode target, String assocType)
    {
        ParameterCheck.mandatory("Target", target);
        ParameterCheck.mandatoryString("Association Type Name", assocType);
        
        this.nodeService.removeAssociation(this.nodeRef, target.nodeRef, createQName(assocType));
        reset();
    }
    
    /**
     * Remove this node. Any references to this Node or its NodeRef should be discarded!
     */
    public boolean remove()
    {
        boolean success = false;
        
        if (nodeService.exists(this.nodeRef))
        {
            this.nodeService.deleteNode(this.nodeRef);
            success = true;
        }
        
        reset();
        
        return success;
    }
    
    /**
     * Copy this Node to a new parent destination. Note that children of the source Node are not copied.
     * 
     * @param destination   Node
     * 
     * @return The newly copied Node instance or null if failed to copy.
     */
    public ScriptNode copy(ScriptNode destination)
    {
        return copy(destination, false);
    }
    
    /**
     * Copy this Node and potentially all child nodes to a new parent destination.
     * 
     * @param destination   Node
     * @param deepCopy      True for a deep copy, false otherwise.
     * 
     * @return The newly copied Node instance or null if failed to copy.
     */
    public ScriptNode copy(ScriptNode destination, boolean deepCopy)
    {
        ParameterCheck.mandatory("Destination Node", destination);
        
        ScriptNode copy = null;
        
        if (destination.getNodeRef().getStoreRef().getProtocol().equals(StoreRef.PROTOCOL_WORKSPACE))
        {
            NodeRef copyRef = this.services.getCopyService().copyAndRename(this.nodeRef, destination.getNodeRef(),
                    ContentModel.ASSOC_CONTAINS, getPrimaryParentAssoc().getQName(), deepCopy);
            copy = newInstance(copyRef, this.services, this.scope);
        }
        else
        {
            // NOTE: the deepCopy flag is not respected for this copy mechanism
            copy = getCrossRepositoryCopyHelper().copy(this, destination, getName());
        }
        
        return copy;
    }
    
    /**
     * Move this Node to a new parent destination.
     * 
     * @param destination   Node
     * 
     * @return true on successful move, false on failure to move.
     */
    public boolean move(ScriptNode destination)
    {
        ParameterCheck.mandatory("Destination Node", destination);
        
        this.primaryParentAssoc = this.nodeService.moveNode(this.nodeRef, destination.getNodeRef(),
                ContentModel.ASSOC_CONTAINS, getPrimaryParentAssoc().getQName());
        
        // reset cached values
        reset();
        
        return true;
    }
    
    /**
     * Add an aspect to the Node. As no properties are provided in this call, it can only be used to add aspects that do not require any mandatory properties.
     * 
     * @param type    Type name of the aspect to add
     * 
     * @return true if the aspect was added successfully, false if an error occured.
     */
    public boolean addAspect(String type)
    {
        return addAspect(type, null);
    }
    
    /**
     * Add an aspect to the Node.
     * 
     * @param type    Type name of the aspect to add
     * @param props   ScriptableObject (generally an assocative array) providing the named properties for the aspect
     *                - any mandatory properties for the aspect must be provided!
     *                
     * @return true if the aspect was added successfully, false if an error occured.
     */
    public boolean addAspect(String type, Object props)
    {
        ParameterCheck.mandatoryString("Aspect Type", type);
        
        Map<QName, Serializable> aspectProps = null;
        if (props instanceof ScriptableObject)
        {
            aspectProps = new HashMap<QName, Serializable>(4, 1.0f);
            extractScriptableProperties((ScriptableObject)props, aspectProps);
        }
        QName aspectQName = createQName(type);
        this.nodeService.addAspect(this.nodeRef, aspectQName, aspectProps);
        
        // reset the relevant cached node members
        reset();
        
        return true;
    }

    /**
     * Extract a map of properties from a scriptable object (generally an associative array)
     * 
     * @param scriptable    The scriptable object to extract name/value pairs from.
     * @param map           The map to add the converted name/value pairs to.
     */
    private void extractScriptableProperties(ScriptableObject scriptable, Map<QName, Serializable> map)
    {
        // we need to get all the keys to the properties provided
        // and convert them to a Map of QName to Serializable objects
        Object[] propIds = scriptable.getIds();
        for (int i = 0; i < propIds.length; i++)
        {
            // work on each key in turn
            Object propId = propIds[i];
            
            // we are only interested in keys that are formed of Strings i.e. QName.toString()
            if (propId instanceof String)
            {
                // get the value out for the specified key - it must be Serializable
                String key = (String)propId;
                Object value = scriptable.get(key, scriptable);
                if (value instanceof Serializable)
                {
                    value = getValueConverter().convertValueForRepo((Serializable)value);
                    map.put(createQName(key), (Serializable)value);
                }
            }
        }
    }
    
    /**
     * Remove aspect from the node.
     * 
     * @param type  the aspect type
     * 
     * @return      true if successful, false otherwise
     */
    public boolean removeAspect(String type)
    {
        ParameterCheck.mandatoryString("Aspect Type", type);
        
        QName aspectQName = createQName(type);
        this.nodeService.removeAspect(this.nodeRef, aspectQName);
        
        // reset the relevant cached node members
        reset();
        
        return true;
    }
    
    
    // ------------------------------------------------------------------------------
    // Checkout/Checkin Services
    
    /**
     * Perform a check-out of this document into the current parent space.
     * 
     * @return the working copy Node for the checked out document
     */
    public ScriptNode checkout()
    {
        NodeRef workingCopyRef = this.services.getCheckOutCheckInService().checkout(this.nodeRef);
        ScriptNode workingCopy = newInstance(workingCopyRef, this.services, this.scope);
        
        // reset the aspect and properties as checking out a document causes changes
        this.properties = null;
        this.aspects = null;
        
        return workingCopy;
    }
    
    /**
     * Perform a check-out of this document into the specified destination space.
     * 
     * @param destination
     *            Destination for the checked out document working copy Node.
     * @return the working copy Node for the checked out document
     */
    public ScriptNode checkout(ScriptNode destination)
    {
        ParameterCheck.mandatory("Destination Node", destination);
        
        ChildAssociationRef childAssocRef = this.nodeService.getPrimaryParent(destination.getNodeRef());
        NodeRef workingCopyRef = this.services.getCheckOutCheckInService().checkout(this.nodeRef,
                destination.getNodeRef(), ContentModel.ASSOC_CONTAINS, childAssocRef.getQName());
        ScriptNode workingCopy = newInstance(workingCopyRef, this.services, this.scope);
        
        // reset the aspect and properties as checking out a document causes changes
        this.properties = null;
        this.aspects = null;
        
        return workingCopy;
    }
    
    /**
     * Check-in a working copy document. The current state of the working copy is copied to the original node,
     * this will include any content updated in the working node. Note that this method can only be called on a
     * working copy Node.
     * 
     * @return the original Node that was checked out.
     */
    public ScriptNode checkin()
    {
        return checkin("", false);
    }
    
    /**
     * Check-in a working copy document. The current state of the working copy is copied to the original node,
     * this will include any content updated in the working node. Note that this method can only be called on a
     * working copy Node.
     * 
     * @param history    Version history note
     * 
     * @return the original Node that was checked out.
     */
    public ScriptNode checkin(String history)
    {
        return checkin(history, false);
    }
    
    /**
     * Check-in a working copy document. The current state of the working copy is copied to the original node,
     * this will include any content updated in the working node. Note that this method can only be called on a
     * working copy Node.
     * 
     * @param history       Version history note
     * @param majorVersion  True to save as a major version increment, false for minor version.
     * 
     * @return the original Node that was checked out.
     */
    public ScriptNode checkin(String history, boolean majorVersion)
    {
        Map<String, Serializable> props = new HashMap<String, Serializable>(2, 1.0f);
        props.put(Version.PROP_DESCRIPTION, history);
        props.put(VersionModel.PROP_VERSION_TYPE, majorVersion ? VersionType.MAJOR : VersionType.MINOR);
        NodeRef original = this.services.getCheckOutCheckInService().checkin(this.nodeRef, props);
        return newInstance(original, this.services, this.scope);
    }
    
    /**
     * Cancel the check-out of a working copy document. The working copy will be deleted and any changes made to it
     * are lost. Note that this method can only be called on a working copy Node. The reference to this working copy
     * Node should be discarded.
     * 
     * @return the original Node that was checked out.
     */
    public ScriptNode cancelCheckout()
    {
        NodeRef original = this.services.getCheckOutCheckInService().cancelCheckout(this.nodeRef);
        return newInstance(original, this.services, this.scope);
    }
    
    
    // ------------------------------------------------------------------------------
    // Transformation and Rendering API
    
    /**
     * Transform a document to a new document mimetype format. A copy of the document is made and the extension
     * changed to match the new mimetype, then the transformation isapplied.
     * 
     * @param mimetype   Mimetype destination for the transformation
     * 
     * @return Node representing the newly transformed document.
     */
    public ScriptNode transformDocument(String mimetype)
    {
        return transformDocument(mimetype, getPrimaryParentAssoc().getParentRef());
    }
    
    /**
     * Transform a document to a new document mimetype format. A copy of the document is made in the specified
     * destination folder and the extension changed to match the new mimetype, then then transformation is applied.
     * 
     * @param mimetype      Mimetype destination for the transformation
     * @param destination   Destination folder location
     * 
     * @return Node representing the newly transformed document.
     */
    public ScriptNode transformDocument(String mimetype, ScriptNode destination)
    {
        return transformDocument(mimetype, destination.getNodeRef());
    }
    
    private ScriptNode transformDocument(String mimetype, NodeRef destination)
    {
        ParameterCheck.mandatoryString("Mimetype", mimetype);
        ParameterCheck.mandatory("Destination Node", destination);
        
        // the delegate definition for transforming a document
        Transformer transformer = new Transformer()
        {
            public ScriptNode transform(ContentService contentService, NodeRef nodeRef, ContentReader reader,
                    ContentWriter writer)
            {
                ScriptNode transformedNode = null;
                if (contentService.isTransformable(reader, writer))
                {
                    contentService.transform(reader, writer);
                    transformedNode = newInstance(nodeRef, services, scope);
                }
                return transformedNode;
            }
        };
        
        return transformNode(transformer, mimetype, destination);
    }
    
    /**
     * Generic method to transform Node content from one mimetype to another.
     * 
     * @param transformer   The Transformer delegate supplying the transformation logic
     * @param mimetype      Mimetype of the destination content
     * @param destination   Destination folder location for the resulting document
     * 
     * @return Node representing the transformed content - or null if the transform failed
     */
    private ScriptNode transformNode(Transformer transformer, String mimetype, NodeRef destination)
    {
        ScriptNode transformedNode = null;
        
        // get the content reader
        ContentService contentService = this.services.getContentService();
        ContentReader reader = contentService.getReader(this.nodeRef, ContentModel.PROP_CONTENT);
        
        // only perform the transformation if some content is available
        if (reader != null)
        {
            // Copy the content node to a new node
            String copyName = TransformActionExecuter.transformName(this.services.getMimetypeService(), getName(),
                    mimetype, true);
            NodeRef copyNodeRef = this.services.getCopyService().copy(this.nodeRef, destination,
                    ContentModel.ASSOC_CONTAINS,
                    QName.createQName(ContentModel.PROP_CONTENT.getNamespaceURI(), QName.createValidLocalName(copyName)),
                    false);
            
            // modify the name of the copy to reflect the new mimetype
            this.nodeService.setProperty(copyNodeRef, ContentModel.PROP_NAME, copyName);
            
            // get the writer and set it up
            ContentWriter writer = contentService.getWriter(copyNodeRef, ContentModel.PROP_CONTENT, true);
            writer.setMimetype(mimetype); // new mimetype
            writer.setEncoding(reader.getEncoding()); // original encoding
            
            // Try and transform the content using the supplied delegate
            transformedNode = transformer.transform(contentService, copyNodeRef, reader, writer);
        }
        
        return transformedNode;
    }
    
    /**
     * Transform an image to a new image format. A copy of the image document is made and the extension changed to
     * match the new mimetype, then the transformation is applied.
     * 
     * @param mimetype   Mimetype destination for the transformation
     * 
     * @return Node representing the newly transformed image.
     */
    public ScriptNode transformImage(String mimetype)
    {
        return transformImage(mimetype, null, getPrimaryParentAssoc().getParentRef());
    }
    
    /**
     * Transform an image to a new image format. A copy of the image document is made and the extension changed to
     * match the new mimetype, then the transformation is applied.
     * 
     * @param mimetype   Mimetype destination for the transformation
     * @param options    Image convert command options
     * 
     * @return Node representing the newly transformed image.
     */
    public ScriptNode transformImage(String mimetype, String options)
    {
        return transformImage(mimetype, options, getPrimaryParentAssoc().getParentRef());
    }
    
    /**
     * Transform an image to a new image mimetype format. A copy of the image document is made in the specified
     * destination folder and the extension changed to match the newmimetype, then then transformation is applied.
     * 
     * @param mimetype      Mimetype destination for the transformation
     * @param destination   Destination folder location
     * 
     * @return Node representing the newly transformed image.
     */
    public ScriptNode transformImage(String mimetype, ScriptNode destination)
    {
        ParameterCheck.mandatory("Destination Node", destination);
        return transformImage(mimetype, null, destination.getNodeRef());
    }
    
    /**
     * Transform an image to a new image mimetype format. A copy of the image document is made in the specified
     * destination folder and the extension changed to match the new
     * mimetype, then then transformation is applied.
     * 
     * @param mimetype      Mimetype destination for the transformation
     * @param options       Image convert command options
     * @param destination   Destination folder location
     * 
     * @return Node representing the newly transformed image.
     */
    public ScriptNode transformImage(String mimetype, String options, ScriptNode destination)
    {
        ParameterCheck.mandatory("Destination Node", destination);
        return transformImage(mimetype, options, destination.getNodeRef());
    }
    
    private ScriptNode transformImage(String mimetype, final String options, NodeRef destination)
    {
        ParameterCheck.mandatoryString("Mimetype", mimetype);
        
        // the delegate definition for transforming an image
        Transformer transformer = new Transformer()
        {
            public ScriptNode transform(ContentService contentService, NodeRef nodeRef, ContentReader reader,
                    ContentWriter writer)
            {
                ImageTransformationOptions imageOptions = new ImageTransformationOptions();
                if (options != null)
                {
                    imageOptions.setCommandOptions(options);
                }
                contentService.getImageTransformer().transform(reader, writer, imageOptions);

                return newInstance(nodeRef, services, scope);
            }
        };
        
        return transformNode(transformer, mimetype, destination);
    }
    
    /**
     * Process a FreeMarker Template against the current node.
     * 
     * @param template      Node of the template to execute
     * 
     * @return output of the template execution
     */
    public String processTemplate(ScriptNode template)
    {
        ParameterCheck.mandatory("Template Node", template);
        return processTemplate(template.getContent(), null, null);
    }
    
    /**
     * Process a FreeMarker Template against the current node.
     * 
     * @param template   Node of the template to execute
     * @param args       Scriptable object (generally an associative array) containing the name/value pairs of
     *                   arguments to be passed to the template
     *                   
     * @return output of the template execution
     */
    public String processTemplate(ScriptNode template, Object args)
    {
        ParameterCheck.mandatory("Template Node", template);
        return processTemplate(template.getContent(), null, (ScriptableObject)args);
    }
    
    /**
     * Process a FreeMarker Template against the current node.
     * 
     * @param template   The template to execute
     * 
     * @return output of the template execution
     */
    public String processTemplate(String template)
    {
        ParameterCheck.mandatoryString("Template", template);
        return processTemplate(template, null, null);
    }
    
    /**
     * Process a FreeMarker Template against the current node.
     * 
     * @param template   The template to execute
     * @param args       Scriptable object (generally an associative array) containing the name/value pairs of
     *                   arguments to be passed to the template
     *                   
     * @return output of the template execution
     */
    public String processTemplate(String template, Object args)
    {
        ParameterCheck.mandatoryString("Template", template);
        return processTemplate(template, null, (ScriptableObject)args);
    }
    
    private String processTemplate(String template, NodeRef templateRef, ScriptableObject args)
    {
        Object person = (Object)scope.get("person", scope);
        Object companyhome = (Object)scope.get("companyhome", scope);
        Object userhome = (Object)scope.get("userhome", scope);
        
        // build default model for the template processing
        Map<String, Object> model = this.services.getTemplateService().buildDefaultModel(
            (person.equals(UniqueTag.NOT_FOUND)) ? null : ((ScriptNode)((Wrapper)person).unwrap()).getNodeRef(),
            (companyhome.equals(UniqueTag.NOT_FOUND)) ? null : ((ScriptNode)((Wrapper)companyhome).unwrap()).getNodeRef(),
            (userhome.equals(UniqueTag.NOT_FOUND)) ? null : ((ScriptNode)((Wrapper)userhome).unwrap()).getNodeRef(),
            templateRef,
            null);
        
        // add the current node as either the document/space as appropriate
        if (this.getIsDocument())
        {
            model.put("document", this.nodeRef);
            model.put("space", getPrimaryParentAssoc().getParentRef());
        }
        else
        {
            model.put("space", this.nodeRef);
        }
        
        // add the supplied args to the 'args' root object
        if (args != null)
        {
            // we need to get all the keys to the properties provided
            // and convert them to a Map of QName to Serializable objects
            Object[] propIds = args.getIds();
            Map<String, String> templateArgs = new HashMap<String, String>(propIds.length);
            for (int i = 0; i < propIds.length; i++)
            {
                // work on each key in turn
                Object propId = propIds[i];
                
                // we are only interested in keys that are formed of Strings i.e. QName.toString()
                if (propId instanceof String)
                {
                    // get the value out for the specified key - make sure it is Serializable
                    Object value = args.get((String) propId, args);
                    value = getValueConverter().convertValueForRepo((Serializable)value);
                    if (value != null)
                    {
                        templateArgs.put((String) propId, value.toString());
                    }
                }
            }
            // add the args to the model as the 'args' root object
            model.put("args", templateArgs);
        }
        
        // execute template!
        // TODO: check that script modified nodes are reflected...
        return this.services.getTemplateService().processTemplateString(null, template, model);
    }
    
    
    // ------------------------------------------------------------------------------
    // Helper methods
    
    /**
     * Override Object.toString() to provide useful debug output
     */
    public String toString()
    {
        if (this.nodeService.exists(nodeRef))
        {
            if (this.services.getPermissionService().hasPermission(nodeRef, PermissionService.READ_PROPERTIES) == AccessStatus.ALLOWED)
            {
                // TODO: DC: Allow debug output of property values - for now it's disabled as this could potentially
                // follow a large network of nodes. Unfortunately, JBPM issues unprotected debug statements
                // where node.toString is used - will request this is fixed in next release of JBPM.
                return "Node Type: " + getType() + ", Node Aspects: " + getAspectsSet().toString();
            }
            else
            {
                return "Access denied to node " + nodeRef;
            }

        }
        else
        {
            return "Node no longer exists: " + nodeRef;
        }
    }

    
    /**
     * Helper to create a QName from either a fully qualified or short-name QName string
     * 
     * @param s    Fully qualified or short-name QName string
     * 
     * @return QName
     */
    private QName createQName(String s)
    {
        QName qname;
        if (s.indexOf(NAMESPACE_BEGIN) != -1)
        {
            qname = QName.createQName(s);
        }
        else
        {
            qname = QName.createQName(s, this.services.getNamespaceService());
        }
        return qname;
    }
    
    /**
     * Reset the Node cached state
     */
    public void reset()
    {
        this.name = null;
        this.type = null;
        this.properties = null;
        this.aspects = null;
        this.targetAssocs = null;
        this.sourceAssocs = null;
        this.childAssocs = null;
        this.children = null;
        this.displayPath = null;
        this.isDocument = null;
        this.isContainer = null;
        this.parent = null;
        this.primaryParentAssoc = null;
    }
    
    /**
     * @return helper object to perform cross repository copy of JavaScript Node objects
     */
    protected CrossRepositoryCopy getCrossRepositoryCopyHelper()
    {
        return (CrossRepositoryCopy)this.services.getService(
                QName.createQName("", CrossRepositoryCopy.BEAN_NAME));
    }
    
    /**
     * Return a list or a single Node from executing an xpath against the parent Node.
     * 
     * @param xpath      XPath to execute
     * @param firstOnly  True to return the first result only
     * 
     * @return Object[] can be empty but never null
     */
    private Object[] getChildrenByXPath(String xpath, QueryParameterDefinition[] params, boolean firstOnly)
    {
        Object[] result = null;
        
        if (xpath.length() != 0)
        {
            if (logger.isDebugEnabled())
            {
               logger.debug("Executing xpath: " + xpath);
               if (params != null)
               {
                  for (int i=0; i<params.length; i++)
                  {
                     logger.debug(" [" + params[i].getQName() + "]=" + params[i].getDefault());
                  }
               }
            }
            
            List<NodeRef> nodes = this.services.getSearchService().selectNodes(this.nodeRef, xpath, params,
                    this.services.getNamespaceService(), false);
            
            // see if we only want the first result
            if (firstOnly == true)
            {
                if (nodes.size() != 0)
                {
                    result = new Object[1];
                    result[0] = newInstance(nodes.get(0), this.services, this.scope);
                }
            }
            // or all the results
            else
            {
                result = new Object[nodes.size()];
                for (int i = 0; i < nodes.size(); i++)
                {
                    NodeRef ref = nodes.get(i);
                    result[i] = newInstance(ref, this.services, this.scope);
                }
            }
        }
        
        return result != null ? result : new Object[0];
    }
    
    
    // ------------------------------------------------------------------------------
    // Value Conversion
    
    /**
     * Gets the node value converter
     * 
     * @return the node value converter
     */
    protected NodeValueConverter getValueConverter()
    {
        if (converter == null)
        {
            converter = createValueConverter();
        }
        return converter;
    }
    
    /**
     * Constructs the node value converter
     * 
     * @return the node value converter
     */
    protected NodeValueConverter createValueConverter()
    {
        return new NodeValueConverter();
    }
    
    // Set support
    
    /**
     * Value converter with knowledge of Node specific value types
     */
    public class NodeValueConverter extends ValueConverter
    {
        /**
         * Convert an object from any repository serialized value to a valid script object. This includes converting
         * Collection multi-value properties into JavaScript Array objects.
         * 
         * @param qname      QName of the property value for conversion
         * @param value      Property value
         * 
         * @return Value safe for scripting usage
         */
        public Serializable convertValueForScript(QName qname, Serializable value)
        {
            return convertValueForScript(services, scope, qname, value);
        }
        
        /*
         * (non-Javadoc)
         * 
         * @see org.alfresco.repo.jscript.ValueConverter#convertValueForScript(org.alfresco.service.ServiceRegistry,
         *      org.mozilla.javascript.Scriptable, org.alfresco.service.namespace.QName, java.io.Serializable)
         */
        @Override
        public Serializable convertValueForScript(ServiceRegistry services, Scriptable scope, QName qname,
                Serializable value)
        {
            if (value instanceof ContentData)
            {
                // ContentData object properties are converted to ScriptContentData objects
                // so the content and other properties of those objects can be accessed
                value = new ScriptContentData((ContentData) value, qname);
            }
            else
            {
                value = super.convertValueForScript(services, scope, qname, value);
            }
            return value;
        }
        
        /*
         * (non-Javadoc)
         * 
         * @see org.alfresco.repo.jscript.ValueConverter#convertValueForRepo(java.io.Serializable)
         */
        @Override
        public Serializable convertValueForRepo(Serializable value)
        {
            if (value instanceof ScriptContentData)
            {
                // convert back to ContentData
                value = ((ScriptContentData) value).contentData;
            }
            else
            {
                value = super.convertValueForRepo(value);
            }
            return value;
        }
    }
    
    
    // ------------------------------------------------------------------------------
    // Inner Classes
    
    
    /**
     * Inner class wrapping and providing access to a ContentData property
     */
    public class ScriptContentData implements Content, Serializable
    {
        private static final long serialVersionUID = -7819328543933312278L;
        
        /**
         * Constructor
         * 
         * @param contentData      The ContentData object this object wraps
         * @param property         The property the ContentData is attached too
         */
        public ScriptContentData(ContentData contentData, QName property)
        {
            this.contentData = contentData;
            this.property = property;
        }

        /* (non-Javadoc)
         * @see org.alfresco.repo.jscript.ScriptNode.ScriptContent#getContent()
         */
        public String getContent()
        {
            ContentService contentService = services.getContentService();
            ContentReader reader = contentService.getReader(nodeRef, property);
            
            return (reader != null && reader.exists()) ? reader.getContentString() : "";
        }
        
        public InputStream getInputStream()
        {
            ContentService contentService = services.getContentService();
            ContentReader reader = contentService.getReader(nodeRef, property);
            
            return (reader != null && reader.exists()) ? reader.getContentInputStream() : null;
        }
        
        /**
         * Set the content stream
         * 
         * @param content    Content string to set
         */
        public void setContent(String content)
        {
            ContentService contentService = services.getContentService();
            ContentWriter writer = contentService.getWriter(nodeRef, this.property, true);
            writer.setMimetype(getMimetype()); // use existing mimetype value
            writer.putContent(content);
            
            // update cached variables after putContent()
            this.contentData = (ContentData) services.getNodeService().getProperty(nodeRef, this.property);
        }
        
        /**
         * Set the content stream from another content object
         *  
         * @param content  ScriptContent to set
         */
        public void write(Content content)
        {
            ContentService contentService = services.getContentService();
            ContentWriter writer = contentService.getWriter(nodeRef, this.property, true);
            writer.setMimetype(content.getMimetype());
            writer.setEncoding(content.getEncoding());
            writer.putContent(content.getInputStream());

            // update cached variables after putContent()
            this.contentData = (ContentData) services.getNodeService().getProperty(nodeRef, this.property);
        }

        /**
         * @return download URL to the content
         */
        public String getUrl()
        {
            return MessageFormat.format(CONTENT_PROP_URL, new Object[] { nodeRef.getStoreRef().getProtocol(),
                    nodeRef.getStoreRef().getIdentifier(), nodeRef.getId(),
                    URLEncoder.encode(getName()),
                    URLEncoder.encode(property.toString()) });
        }
        
        /**
         * @return download URL to the content for a document item only
         */
        public String getDownloadUrl()
        {
            if (getIsDocument() == true)
            {
                return MessageFormat.format(CONTENT_DOWNLOAD_PROP_URL, new Object[] {
                        nodeRef.getStoreRef().getProtocol(),
                        nodeRef.getStoreRef().getIdentifier(),
                        nodeRef.getId(),
                        URLEncoder.encode(getName()),
                        URLEncoder.encode(property.toString()) });
            }
            else
            {
                return "";
            }
        }

        public long getSize()
        {
            return contentData.getSize();
        }
        
        public String getMimetype()
        {
            return contentData.getMimetype();
        }
        
        public String getEncoding()
        {
            return contentData.getEncoding();
        }
        
        public void setEncoding(String encoding)
        {
            this.contentData = ContentData.setEncoding(this.contentData, encoding);
            services.getNodeService().setProperty(nodeRef, this.property, this.contentData);
            
            // update cached variables after putContent()
            this.contentData = (ContentData) services.getNodeService().getProperty(nodeRef, this.property);
        }

        public void setMimetype(String mimetype)
        {
            this.contentData = ContentData.setMimetype(this.contentData, mimetype);
            services.getNodeService().setProperty(nodeRef, this.property, this.contentData);
            
            // update cached variables after putContent()
            this.contentData = (ContentData) services.getNodeService().getProperty(nodeRef, this.property);
        }
        
        private ContentData contentData;
        private QName property;
    }
    
    /**
     * Interface contract for simple anonymous classes that implement document transformations
     */
    private interface Transformer
    {
        /**
         * Transform the reader to the specified writer
         * 
         * @param contentService   ContentService
         * @param noderef          NodeRef of the destination for the transform
         * @param reader           Source reader
         * @param writer           Destination writer
         * 
         * @return Node representing the transformed entity
         */
        ScriptNode transform(ContentService contentService, NodeRef noderef, ContentReader reader, ContentWriter writer);
    }
}