. Checkpoint for the Rhino JavaScript engine integration:

- Additions to the Alfresco JavaScript data-model
. JUnit test for each entry point into Rhino and the ScriptService
  - tests for various API calls on the Scriptable Node object
. More javadoc clean-up in templating and script services

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2726 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Kevin Roast
2006-04-28 10:56:48 +00:00
parent fff0a5d49c
commit 2b251c922b
8 changed files with 422 additions and 76 deletions

View File

@@ -23,6 +23,7 @@ import java.text.MessageFormat;
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.ContentModel;
@@ -37,6 +38,7 @@ import org.alfresco.service.cmr.repository.ContentReader;
import org.alfresco.service.cmr.repository.ContentService;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.TemplateImageResolver;
import org.alfresco.service.cmr.repository.TemplateNode;
import org.alfresco.service.namespace.QName;
import org.alfresco.service.namespace.RegexQNamePattern;
import org.apache.commons.logging.Log;
@@ -44,11 +46,12 @@ import org.apache.commons.logging.LogFactory;
import org.springframework.util.StringUtils;
/**
* Node class specific for use by Template pages that support Bean objects as part of the model.
* The default template engine FreeMarker can use these objects and they are provided to support it.
* A single method is completely freemarker specific - getXmlNodeModel()
* Node class implementation specific for use by ScriptService as part of the object model.
* <p>
* The class exposes Node properties, children as dynamically populated maps and lists.
* <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 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.
@@ -113,8 +116,6 @@ public final class Node implements Serializable
this.id = nodeRef.getId();
this.services = services;
this.imageResolver = resolver;
this.properties = new ScriptableQNameMap<String, Object>(this.services.getNamespaceService());
}
/**
@@ -125,6 +126,11 @@ public final class Node implements Serializable
return this.id;
}
public String jsGet_id()
{
return getId();
}
/**
* @return Returns the NodeRef this Node object represents
*/
@@ -133,6 +139,11 @@ public final class Node implements Serializable
return this.nodeRef;
}
public NodeRef jsGet_nodeRef()
{
return getNodeRef();
}
/**
* @return Returns the type.
*/
@@ -146,6 +157,11 @@ public final class Node implements Serializable
return type;
}
public QName jsGet_type()
{
return getType();
}
/**
* @return The display name for the node
*/
@@ -174,6 +190,16 @@ public final class Node implements Serializable
return this.name;
}
public String jsGet_name()
{
return getName();
}
public void jsSet_name(String name)
{
this.getProperties().put(ContentModel.PROP_NAME.toString(), name);
}
/**
* @return The children of this Node as Node wrappers
*/
@@ -194,21 +220,54 @@ public final class Node implements Serializable
return this.children;
}
public Node[] jsGet_children()
{
return getChildren();
}
/**
* @return A map capable of returning the Node at the specified Path as a child of this node.
* @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 Map getChildByNamePath()
public Node childByNamePath(String path)
{
// convert the name based path to a valid XPath query
StringBuilder xpath = new StringBuilder(path.length() << 1);
for (StringTokenizer t = new StringTokenizer(path, "/"); t.hasMoreTokens(); /**/)
{
if (xpath.length() != 0)
{
xpath.append('/');
}
xpath.append("*[@cm:name='")
.append(t.nextToken()) // TODO: use QueryParameterDefinition see FileFolderService.search()
.append("']");
}
Node[] nodes = getChildrenByXPath(xpath.toString(), true);
return (nodes.length != 0) ? nodes[0] : null;
}
// TODO: find out why this doesn't work - the function defs do not seem to get found
//public Node jsFunction_childByNamePath(String path)
//{
// return new NamePathResultsMap(this, this.services);
// return getChildByNamePath(path);
//}
/**
* @return A map capable of returning a List of Node objects from an XPath query
* as children of this node.
* @return Returns the Nodes at the specified XPath walking the children of this Node.
* So a valid call might be <code>mynode.childrenByXPath("/*[@cm:name='Testing']/*");</code>
*/
//public Map getChildrenByXPath()
public Node[] childrenByXPath(String xpath)
{
return getChildrenByXPath(xpath, false);
}
// TODO: find out why this doesn't work - the function defs do not seem to get found
//public Node[] jsFunction_childrenByXPath(String xpath)
//{
// return new XPathResultsMap(this, this.services);
// return childrenByXPath(xpath);
//}
/**
@@ -242,8 +301,10 @@ public final class Node implements Serializable
{
if (this.assocs == null)
{
List<AssociationRef> refs = this.services.getNodeService().getTargetAssocs(this.nodeRef, RegexQNamePattern.MATCH_ALL);
// this Map implements the Scriptable interface for native JS syntax property access
this.assocs = new ScriptableQNameMap<String, Node[]>(this.services.getNamespaceService());
List<AssociationRef> refs = this.services.getNodeService().getTargetAssocs(this.nodeRef, RegexQNamePattern.MATCH_ALL);
for (AssociationRef ref : refs)
{
String qname = ref.getTypeQName().toString();
@@ -268,6 +329,11 @@ public final class Node implements Serializable
return this.assocs;
}
public Map<String, Node[]> jsGet_assocs()
{
return getAssocs();
}
/**
* Return all the properties known about this node.
*
@@ -281,8 +347,10 @@ public final class Node implements Serializable
{
if (this.propsRetrieved == false)
{
Map<QName, Serializable> props = this.services.getNodeService().getProperties(this.nodeRef);
// this Map implements the Scriptable interface for native JS syntax property access
this.properties = new ScriptableQNameMap<String, Object>(this.services.getNamespaceService());
Map<QName, Serializable> props = this.services.getNodeService().getProperties(this.nodeRef);
for (QName qname : props.keySet())
{
Serializable propValue = props.get(qname);
@@ -307,6 +375,11 @@ public final class Node implements Serializable
return this.properties;
}
public Map<String, Object> jsGet_properties()
{
return getProperties();
}
/**
* @return true if this Node is a container (i.e. a folder)
*/
@@ -322,6 +395,11 @@ public final class Node implements Serializable
return isContainer.booleanValue();
}
public boolean jsGet_isContainer()
{
return isContainer();
}
/**
* @return true if this Node is a Document (i.e. with content)
*/
@@ -336,6 +414,11 @@ public final class Node implements Serializable
return isDocument.booleanValue();
}
public boolean jsGet_isDocument()
{
return isDocument();
}
/**
* @return The list of aspects applied to this node
*/
@@ -349,6 +432,11 @@ public final class Node implements Serializable
return this.aspects;
}
public QName[] jsGet_aspects()
{
return getAspects().toArray(new QName[getAspects().size()]);
}
/**
* @param aspect The aspect name to test for
*
@@ -400,6 +488,11 @@ public final class Node implements Serializable
return displayPath;
}
public String jsGet_displayPath()
{
return getDisplayPath();
}
/**
* @return the small icon image for this node
*/
@@ -422,6 +515,11 @@ public final class Node implements Serializable
}
}
public String jsGet_icon16()
{
return getIcon16();
}
/**
* @return the large icon image for this node
*/
@@ -452,6 +550,11 @@ public final class Node implements Serializable
}
}
public String jsGet_icon32()
{
return getIcon32();
}
/**
* @return true if the node is currently locked
*/
@@ -471,6 +574,11 @@ public final class Node implements Serializable
return locked;
}
public boolean jsGet_isLocked()
{
return isLocked();
}
/**
* @return the parent node
*/
@@ -489,6 +597,11 @@ public final class Node implements Serializable
return parent;
}
public Node jsGet_parent()
{
return getParent();
}
/**
*
* @return the primary parent association so we can get at the association QName and the association type QName.
@@ -502,6 +615,11 @@ public final class Node implements Serializable
return primaryParentAssoc;
}
public ChildAssociationRef jsGet_primaryParentAssoc()
{
return getPrimaryParentAssoc();
}
/**
* @return the content String for this node from the default content property
* (@see ContentModel.PROP_CONTENT)
@@ -513,6 +631,11 @@ public final class Node implements Serializable
return (reader != null && reader.exists()) ? reader.getContentString() : "";
}
public String jsGet_content()
{
return getContent();
}
/**
* @return For a content document, this method returns the URL to the content stream for
* the default content property (@see ContentModel.PROP_CONTENT)
@@ -545,6 +668,11 @@ public final class Node implements Serializable
}
}
public String jsGet_url()
{
return getUrl();
}
/**
* @return The mimetype encoding for content attached to the node from the default content property
* (@see ContentModel.PROP_CONTENT)
@@ -563,6 +691,11 @@ public final class Node implements Serializable
return mimetype;
}
public String jsGet_mimetype()
{
return getMimetype();
}
/**
* @return The size in bytes of the content attached to the node from the default content property
* (@see ContentModel.PROP_CONTENT)
@@ -581,6 +714,11 @@ public final class Node implements Serializable
return size != null ? size.longValue() : 0L;
}
public long jsGet_size()
{
return getSize();
}
/**
* @return the image resolver instance used by this node
*/
@@ -606,6 +744,63 @@ public final class Node implements Serializable
}
}
/**
* 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 Node[] can be empty but never null
*/
private Node[] getChildrenByXPath(String xpath, boolean firstOnly)
{
Node[] result = null;
if (xpath.length() != 0)
{
if (logger.isDebugEnabled())
logger.debug("Executing xpath: " + xpath);
NodeRef contextRef;
if (getParent() != null)
{
contextRef = getParent().getNodeRef();
}
else
{
contextRef = this.services.getNodeService().getRootNode(nodeRef.getStoreRef());
}
List<NodeRef> nodes = this.services.getSearchService().selectNodes(
contextRef,
xpath,
null,
this.services.getNamespaceService(),
false);
// see if we only want the first result
if (firstOnly == true)
{
if (nodes.size() != 0)
{
result = new Node[1];
result[0] = new Node(nodes.get(0), this.services, this.imageResolver);
}
}
// or all the results
else
{
result = new Node[nodes.size()];
for (int i=0; i<nodes.size(); i++)
{
NodeRef ref = nodes.get(i);
result[i] = new Node(ref, this.services, this.imageResolver);
}
}
}
return result != null ? result : new Node[0];
}
/**
* Inner class wrapping and providing access to a ContentData property

View File

@@ -31,6 +31,7 @@ import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.cmr.repository.ScriptException;
import org.alfresco.service.cmr.repository.ScriptService;
import org.alfresco.service.namespace.QName;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
@@ -71,7 +72,8 @@ public class RhinoScriptService implements ScriptService
/**
* @see org.alfresco.service.cmr.repository.ScriptService#executeScript(java.lang.String, java.util.Map)
*/
public Object executeScript(String scriptClasspath, Map<String, Object> model) throws ScriptException
public Object executeScript(String scriptClasspath, Map<String, Object> model)
throws ScriptException
{
if (scriptClasspath == null)
{
@@ -104,9 +106,10 @@ public class RhinoScriptService implements ScriptService
}
/**
* @see org.alfresco.service.cmr.repository.ScriptService#executeScript(org.alfresco.service.cmr.repository.NodeRef, java.util.Map)
* @see org.alfresco.service.cmr.repository.ScriptService#executeScript(org.alfresco.service.cmr.repository.NodeRef, org.alfresco.service.namespace.QName, java.util.Map)
*/
public Object executeScript(NodeRef scriptRef, Map<String, Object> model) throws ScriptException
public Object executeScript(NodeRef scriptRef, QName contentProp, Map<String, Object> model)
throws ScriptException
{
if (scriptRef == null)
{
@@ -120,7 +123,12 @@ public class RhinoScriptService implements ScriptService
{
throw new AlfrescoRuntimeException("Script Node does not exist: " + scriptRef);
}
ContentReader cr = this.contentService.getReader(scriptRef, ContentModel.PROP_CONTENT);
if (contentProp == null)
{
contentProp = ContentModel.PROP_CONTENT;
}
ContentReader cr = this.contentService.getReader(scriptRef, contentProp);
if (cr == null || cr.exists() == false)
{
throw new AlfrescoRuntimeException("Script Node content not found: " + scriptRef);
@@ -145,7 +153,8 @@ public class RhinoScriptService implements ScriptService
/**
* @see org.alfresco.service.cmr.repository.ScriptService#executeScriptString(java.lang.String, java.util.Map)
*/
public Object executeScriptString(String script, Map<String, Object> model) throws ScriptException
public Object executeScriptString(String script, Map<String, Object> model)
throws ScriptException
{
if (script == null || script.length() == 0)
{
@@ -193,7 +202,8 @@ public class RhinoScriptService implements ScriptService
{
for (String key : model.keySet())
{
ScriptableObject.putProperty(scope, key, model.get(key));
Object jsObject = Context.javaToJS(model.get(key), scope);
ScriptableObject.putProperty(scope, key, jsObject);
}
}

View File

@@ -17,10 +17,14 @@
package org.alfresco.repo.jscript;
import java.io.InputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import junit.framework.TestCase;
import org.alfresco.repo.content.MimetypeMap;
import org.alfresco.repo.dictionary.DictionaryComponent;
import org.alfresco.repo.dictionary.DictionaryDAO;
import org.alfresco.repo.dictionary.M2Model;
@@ -29,11 +33,14 @@ import org.alfresco.repo.security.authentication.AuthenticationComponent;
import org.alfresco.repo.transaction.TransactionUtil;
import org.alfresco.service.ServiceRegistry;
import org.alfresco.service.cmr.repository.ChildAssociationRef;
import org.alfresco.service.cmr.repository.ContentData;
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.ScriptService;
import org.alfresco.service.cmr.repository.StoreRef;
import org.alfresco.service.cmr.repository.TemplateService;
import org.alfresco.service.namespace.QName;
import org.alfresco.service.transaction.TransactionService;
import org.alfresco.util.ApplicationContextHelper;
import org.mozilla.javascript.Context;
@@ -49,11 +56,11 @@ public class RhinoScriptTest extends TestCase
private static final ApplicationContext ctx = ApplicationContextHelper.getApplicationContext();
private ContentService contentService;
private TemplateService templateService;
private NodeService nodeService;
private TransactionService transactionService;
private ServiceRegistry serviceRegistry;
private AuthenticationComponent authenticationComponent;
private ScriptService scriptService;
/*
* @see junit.framework.TestCase#setUp()
@@ -65,7 +72,7 @@ public class RhinoScriptTest extends TestCase
transactionService = (TransactionService)this.ctx.getBean("transactionComponent");
contentService = (ContentService)this.ctx.getBean("contentService");
nodeService = (NodeService)this.ctx.getBean("nodeService");
templateService = (TemplateService)this.ctx.getBean("templateService");
scriptService = (ScriptService)this.ctx.getBean("scriptService");
serviceRegistry = (ServiceRegistry)this.ctx.getBean("ServiceRegistry");
this.authenticationComponent = (AuthenticationComponent)ctx.getBean("authenticationComponent");
@@ -98,7 +105,55 @@ public class RhinoScriptTest extends TestCase
super.tearDown();
}
public void testRhino()
public void testRhinoIntegration()
{
TransactionUtil.executeInUserTransaction(
transactionService,
new TransactionUtil.TransactionWork<Object>()
{
public Object doWork() throws Exception
{
// check that rhino script engine is available
Context cx = Context.enter();
try
{
// The easiest way to embed Rhino is just to create a new scope this way whenever
// you need one. However, initStandardObjects is an expensive method to call and it
// allocates a fair amount of memory.
Scriptable scope = cx.initStandardObjects();
// Now we can evaluate a script. Let's create a new associative array object
// using the object literal notation to create the members
Object result = cx.evaluateString(scope, "obj = {a:1, b:['x','y']}", "TestJS1", 1, null);
Scriptable obj = (Scriptable)scope.get("obj", scope);
// Should resolve a non-null value
assertNotNull(obj.get("a", obj));
// should resolve "obj.a == 1" - JavaScript objects come back as Number
assertEquals(new Double(1.0), obj.get("a", obj));
// try another script eval - this time a function call returning a result
result = cx.evaluateString(scope, "function f(x) {return x+1} f(7)", "TestJS2", 1, null);
assertEquals(8.0, cx.toNumber(result));
}
catch (Throwable err)
{
err.printStackTrace();
fail(err.getMessage());
}
finally
{
cx.exit();
}
return null;
}
});
}
public void testJSObjectWrapping()
{
TransactionUtil.executeInUserTransaction(
transactionService,
@@ -110,44 +165,27 @@ public class RhinoScriptTest extends TestCase
NodeRef root = nodeService.getRootNode(store);
BaseNodeServiceTest.buildNodeGraph(nodeService, root);
// check that rhino script engine is available
Context cx = Context.enter();
try
{
// The easiest way to embed Rhino is just to create a new scope this way whenever
// you need one. However, initStandardObjects is an expensive method to call and it
// allocates a fair amount of memory.
Scriptable scope = cx.initStandardObjects();
// wrap System.out so we can perform println() from within scripts
Object wrappedOut = Context.javaToJS(System.out, scope);
ScriptableObject.putProperty(scope, "out", wrappedOut);
// Now we can evaluate a script. Let's create a new associative array object
// using the object literal notation to create the members
Object result = cx.evaluateString(scope, "obj = {a:1, b:['x','y']}", "TestJS1", 1, null);
Scriptable obj = (Scriptable)scope.get("obj", scope);
// Should resolve a non-null value
assertNotNull(obj.get("a", obj));
// should resolve "obj.a == 1" - JavaScript objects come back as Number
assertEquals(new Double(1.0), obj.get("a", obj));
// try another script eval
result = cx.evaluateString(scope, "function f(x) {return x+1} f(7)", "TestJS2", 1, null);
assertEquals(8.0, cx.toNumber(result));
// wrap a simple Alfresco NodeRef object
// wrap a simple NodeRef Java object
// we can use Java style method calls within the script to access it's properties
List<ChildAssociationRef> childAssocs = nodeService.getChildAssocs(root);
NodeRef ref1 = childAssocs.get(0).getChildRef();
Object wrappedNodeRef = Context.javaToJS(ref1, scope);
ScriptableObject.putProperty(scope, "rootref", wrappedNodeRef);
// evaluate script that touches the wrapped NodeRef
result = cx.evaluateString(scope, "obj = rootref.getId()", "TestJS3", 1, null);
Object result = cx.evaluateString(scope, "obj = rootref.getId()", "TestJS3", 1, null);
assertEquals(ref1.getId(), cx.toString(result));
// wrap a script Alfresco Node object - the Node object is a wrapper like TemplateNode
// wrap a scriptable Alfresco Node object - the Node object is a wrapper like TemplateNode
Node node1 = new Node(root, serviceRegistry, null);
Object wrappedNode = Context.javaToJS(node1, scope);
ScriptableObject.putProperty(scope, "root", wrappedNode);
@@ -170,15 +208,79 @@ public class RhinoScriptTest extends TestCase
});
}
//private static final String TEMPLATE_1 = "org/alfresco/repo/template/test_template1.ftl";
public void testScriptService()
{
TransactionUtil.executeInUserTransaction(
transactionService,
new TransactionUtil.TransactionWork<Object>()
{
public Object doWork() throws Exception
{
StoreRef store = nodeService.createStore(StoreRef.PROTOCOL_WORKSPACE, "rhino_" + System.currentTimeMillis());
NodeRef root = nodeService.getRootNode(store);
BaseNodeServiceTest.buildNodeGraph(nodeService, root);
try
{
Map<String, Object> model = new HashMap<String, Object>();
model.put("out", System.out);
// create an Alfresco scriptable Node object
// the Node object is a wrapper similar to the TemplateNode concept
Node rootNode = new Node(root, serviceRegistry, null);
model.put("root", rootNode);
// execute test scripts using the various entry points of the ScriptService
// test executing a script file via classpath lookup
Object result = scriptService.executeScript(TESTSCRIPT_CLASSPATH1, model);
System.out.println("Result from TESTSCRIPT_CLASSPATH1: " + result.toString());
assertTrue((Boolean)result); // we know the result is a boolean
// test executing a script embedded inside Node content
ChildAssociationRef childRef = nodeService.createNode(
root,
BaseNodeServiceTest.ASSOC_TYPE_QNAME_TEST_CHILDREN,
QName.createQName(BaseNodeServiceTest.NAMESPACE, "script_content"),
BaseNodeServiceTest.TYPE_QNAME_TEST_CONTENT,
null);
NodeRef contentNodeRef = childRef.getChildRef();
ContentWriter writer = contentService.getWriter(
contentNodeRef,
BaseNodeServiceTest.PROP_QNAME_TEST_CONTENT,
true);
writer.setMimetype("application/x-javascript");
writer.putContent(TESTSCRIPT1);
scriptService.executeScript(contentNodeRef, BaseNodeServiceTest.PROP_QNAME_TEST_CONTENT, model);
// test executing a script directly as a String
scriptService.executeScriptString(TESTSCRIPT1, model);
}
catch (Throwable err)
{
err.printStackTrace();
fail(err.getMessage());
}
return null;
}
});
}
private static final String TESTSCRIPT_CLASSPATH1 = "org/alfresco/repo/jscript/test_script1.js";
private static final String TESTSCRIPT1 =
"var id = root.getId();\r\n" +
"var id = root.id;\r\n" +
"out.println(id);\r\n" +
"var name = root.getName();\r\n" +
"var name = root.name;\r\n" +
"out.println(name);\r\n" +
"var type = root.getType();\r\n" +
"var type = root.type;\r\n" +
"out.println(type);\r\n" +
"var childList = root.getChildren();\r\n" +
"out.println(\"zero index node: \" + childList[0].getName());\r\n" +
"out.println(\"properties: \" + childList[0].getProperties()[\"name\"] );";
"var childList = root.children;\r\n" +
"out.println(\"zero index node name: \" + childList[0].name);\r\n" +
"out.println(\"name property access: \" + childList[0].properties.name );\r\n" +
"var childByNameNode = root.childByNamePath(\"/\" + childList[0].name);\r\n" +
"out.println(\"child by name path: \" + childByNameNode.name);\r\n" +
"var xpathResults = root.childrenByXPath(\"/*\");\r\n" +
"out.println(\"children of root from xpath: \" + xpathResults.length);\r\n";
}

View File

@@ -40,14 +40,21 @@ public class ScriptableQNameMap<K,V> extends QNameMap<K,V> implements Scriptable
{
return "ScriptableQNameMap";
}
/**
* @see org.mozilla.javascript.Scriptable#get(java.lang.String, org.mozilla.javascript.Scriptable)
*/
public Object get(String name, Scriptable start)
{
// get the property from the underlying QName map
return get(name);
if ("length".equals(name))
{
return this.size();
}
else
{
return get(name);
}
}
/**

View File

@@ -0,0 +1,25 @@
var id = root.id;
var name = root.name;
out.println("Name: " + name);
var type = root.type;
out.println("ID: " + id + " of type: " + type);
var noderef = root.nodeRef;
out.println("NodeRef: " + noderef);
var childList = root.children;
out.println("Has " + childList.length + " child nodes");
var properties = root.properties;
out.println("Property Count: " + properties.length);
var assocs = root.assocs;
out.println("Assoc Count: " + assocs.length);
// test various access mechanisms
var childname1 = childList[0].name;
var childname2 = childList[0].properties.name
var childname3 = childList[0].properties["name"];
var childname4 = childList[0].properties["cm:name"];
function result()
{
return (childname1 == childname2 && childname2 == childname3 && childname3 == childname4);
}
result();