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SAIL-244: Added an XSLT Template Processor (hooked into the template service) along with an XSLT rendering engine that makes use of it.

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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@19153 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Brian Remmington
2010-03-09 14:02:55 +00:00
parent 7073ab6f88
commit 91ba631a3b
16 changed files with 2838 additions and 171 deletions
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200
source/java/org/alfresco/repo/template/XSLTProcessorMethodInvoker.java Normal file
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/*
* Copyright (C) 2005-2010 Alfresco Software Limited.
*
* This file is part of Alfresco
*
* Alfresco is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Alfresco 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
*/
package org.alfresco.repo.template;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xml.dtm.ref.DTMNodeProxy;
import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.NodeFilter;
import org.w3c.dom.traversal.NodeIterator;
/**
* @author Brian
*
*/
public class XSLTProcessorMethodInvoker
{
private final static Log log = LogFactory.getLog(XSLTProcessorMethodInvoker.class);
private final static Map<String, TemplateProcessorMethod> PROCESSOR_METHODS = new TreeMap<String, TemplateProcessorMethod>();
public XSLTProcessorMethodInvoker()
{
}
public static void addMethod(String name, TemplateProcessorMethod method)
{
PROCESSOR_METHODS.put(name, method);
}
public static void removeMethods(Collection<String> methodNames)
{
for (String methodName : methodNames)
{
PROCESSOR_METHODS.remove(methodName);
}
}
private Object[] convertArguments(final Object[] arguments)
{
final List<Object> result = new LinkedList<Object>();
for (int i = 0; i < arguments.length; i++)
{
log.debug("args[" + i + "] = " + arguments[i] + "("
+ (arguments[i] != null ? arguments[i].getClass().getName() : "null") + ")");
if (arguments[i] == null || arguments[i] instanceof String || arguments[i] instanceof Number)
{
result.add(arguments[i]);
}
else if (arguments[i] instanceof DTMNodeProxy)
{
result.add(((DTMNodeProxy) arguments[i]).getStringValue());
}
else if (arguments[i] instanceof Node)
{
log.debug("node type is " + ((Node) arguments[i]).getNodeType() + " content "
+ ((Node) arguments[i]).getTextContent());
result.add(((Node) arguments[i]).getNodeValue());
}
else if (arguments[i] instanceof NodeIterator)
{
Node n = ((NodeIterator) arguments[i]).nextNode();
while (n != null)
{
log.debug("iterated to node " + n + " type " + n.getNodeType() + " value " + n.getNodeValue()
+ " tc " + n.getTextContent() + " nn " + n.getNodeName() + " sv "
+ ((org.apache.xml.dtm.ref.DTMNodeProxy) n).getStringValue());
if (n instanceof DTMNodeProxy)
{
result.add(((DTMNodeProxy) n).getStringValue());
}
else
{
result.add(n);
}
n = ((NodeIterator) arguments[i]).nextNode();
}
}
else
{
throw new IllegalArgumentException("unable to convert argument " + arguments[i]);
}
}
return result.toArray(new Object[result.size()]);
}
public Object invokeMethod(final String id, Object[] arguments) throws Exception
{
if (!PROCESSOR_METHODS.containsKey(id))
{
throw new NullPointerException("unable to find method " + id);
}
final TemplateProcessorMethod method = PROCESSOR_METHODS.get(id);
arguments = this.convertArguments(arguments);
log.debug("invoking " + id + " with " + arguments.length);
Object result = method.exec(arguments);
log.debug(id + " returned a " + result);
if (result == null)
{
return null;
}
else if (result.getClass().isArray() && Node.class.isAssignableFrom(result.getClass().getComponentType()))
{
log.debug("converting " + result + " to a node iterator");
final Node[] array = (Node[]) result;
return new NodeIterator()
{
private int index = 0;
private boolean detached = false;
public void detach()
{
if (log.isDebugEnabled())
log.debug("detaching NodeIterator");
this.detached = true;
}
public boolean getExpandEntityReferences()
{
return true;
}
public int getWhatToShow()
{
return NodeFilter.SHOW_ALL;
}
public Node getRoot()
{
return (array.length == 0 ? null : array[0].getOwnerDocument().getDocumentElement());
}
public NodeFilter getFilter()
{
return new NodeFilter()
{
public short acceptNode(final Node n)
{
return NodeFilter.FILTER_ACCEPT;
}
};
}
public Node nextNode() throws DOMException
{
if (log.isDebugEnabled())
log.debug("NodeIterator.nextNode(" + index + ")");
if (this.detached)
throw new DOMException(DOMException.INVALID_STATE_ERR, null);
return index == array.length ? null : array[index++];
}
public Node previousNode() throws DOMException
{
if (log.isDebugEnabled())
log.debug("NodeIterator.previousNode(" + index + ")");
if (this.detached)
throw new DOMException(DOMException.INVALID_STATE_ERR, null);
return index == -1 ? null : array[index--];
}
};
}
else if (result instanceof String || result instanceof Number || result instanceof Node)
{
log.debug("returning " + result + " as is");
return result;
}
else
{
throw new IllegalArgumentException("unable to convert " + result.getClass().getName());
}
}
}