[144023] JS classpath improvements.
diff --git a/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/ComponentCore.java b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/ComponentCore.java
index 243e84b..ba2b4b4 100644
--- a/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/ComponentCore.java
+++ b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/ComponentCore.java
@@ -22,11 +22,11 @@
 import org.eclipse.wst.common.componentcore.internal.StructureEdit;
 import org.eclipse.wst.common.componentcore.internal.impl.ResourceTreeNode;
 import org.eclipse.wst.common.componentcore.internal.resources.VirtualArchiveComponent;
-import org.eclipse.wst.common.componentcore.internal.resources.VirtualComponent;
 import org.eclipse.wst.common.componentcore.internal.resources.VirtualFile;
 import org.eclipse.wst.common.componentcore.internal.resources.VirtualFolder;
 import org.eclipse.wst.common.componentcore.internal.resources.VirtualReference;
 import org.eclipse.wst.common.componentcore.internal.resources.VirtualResource;
+import org.eclipse.wst.common.componentcore.internal.util.ComponentImplRegistryReader;
 import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
 import org.eclipse.wst.common.componentcore.resources.IVirtualContainer;
 import org.eclipse.wst.common.componentcore.resources.IVirtualFile;
@@ -64,7 +64,7 @@
 	public static IVirtualComponent createComponent(IProject aProject) {
 		if (!ModuleCoreNature.isFlexibleProject(aProject))
 			return null;
-		return new VirtualComponent(aProject, new Path("/")); //$NON-NLS-1$
+		return ComponentImplRegistryReader.instance().createComponent(aProject);
 	}
 
 	/**
diff --git a/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/resources/VirtualComponent.java b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/resources/VirtualComponent.java
index 9d29fcf..3226de1 100644
--- a/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/resources/VirtualComponent.java
+++ b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/resources/VirtualComponent.java
@@ -46,6 +46,9 @@
 	private int flag = 0;
 	
 
+	protected VirtualComponent(){
+	}
+	
 	public VirtualComponent(IProject aProject, IPath aRuntimePath) {
 		componentProject = aProject;
 		runtimePath = aRuntimePath;
diff --git a/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/util/ComponentImplRegistryReader.java b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/util/ComponentImplRegistryReader.java
new file mode 100644
index 0000000..09d0c87
--- /dev/null
+++ b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/util/ComponentImplRegistryReader.java
@@ -0,0 +1,181 @@
+/*******************************************************************************
+ * Copyright (c) 2003, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.wst.common.componentcore.internal.util;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.ISafeRunnable;
+import org.eclipse.core.runtime.Path;
+import org.eclipse.core.runtime.SafeRunner;
+import org.eclipse.jem.util.RegistryReader;
+import org.eclipse.wst.common.componentcore.internal.ModulecorePlugin;
+import org.eclipse.wst.common.componentcore.internal.resources.VirtualComponent;
+import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
+import org.eclipse.wst.common.project.facet.core.IFacetedProject;
+import org.eclipse.wst.common.project.facet.core.IProjectFacet;
+import org.eclipse.wst.common.project.facet.core.ProjectFacetsManager;
+
+public class ComponentImplRegistryReader extends RegistryReader {
+
+	private static final String COMPONENT_IMPL_EXTENSION_POINT = "componentimpl"; //$NON-NLS-1$
+	private static final String COMPONENT_IMPL = "componentimpl"; //$NON-NLS-1$
+	private static final String TYPE = "typeID"; //$NON-NLS-1$
+	private static final String CLASS = "class"; //$NON-NLS-1$
+
+	private static final ComponentImplRegistryReader instance = new ComponentImplRegistryReader();
+
+	private final Map/* <String, ComponentImplDescriptor> */descriptors = new HashMap();
+
+	private final Map/* <ArtifactEditDescriptor, IComponentImplFactory> */instances = new HashMap();
+
+	/**
+	 * @return Returns the instance.
+	 */
+	public static ComponentImplRegistryReader instance() {
+		/* already initialized and registry read by the time the class initializes */
+		return instance;
+	}
+
+	public ComponentImplRegistryReader() {
+		super(ModulecorePlugin.PLUGIN_ID, COMPONENT_IMPL_EXTENSION_POINT);
+		SafeRunner.run(new ISafeRunnable() {
+
+			public void handleException(Throwable exception) {
+				ModulecorePlugin.logError(0, exception.getMessage(), exception);
+			}
+
+			public void run() throws Exception {
+				readRegistry();
+			}
+
+		});
+	}
+
+	/**
+	 * @see org.eclipse.wst.common.frameworks.internal.RegistryReader#readElement(org.eclipse.core.runtime.IConfigurationElement)
+	 */
+	public boolean readElement(IConfigurationElement element) {
+		if (COMPONENT_IMPL.equals(element.getName())) {
+
+			/*
+			 * Because the only instance of this type is created from a static singleton field, and
+			 * the registry is initialized in the constructor of this type, other threads cannot
+			 * compete with readElement() for access to <i>descriptors</i>
+			 */
+			String type = element.getAttribute(TYPE);
+			if (type != null)
+				descriptors.put(element.getAttribute(TYPE), new ComponentImplDescriptor(element));
+			else
+				ModulecorePlugin.logError(0, "No type attribute is specified for " + //$NON-NLS-1$
+							ModulecorePlugin.PLUGIN_ID + "." + COMPONENT_IMPL_EXTENSION_POINT + //$NON-NLS-1$ 
+							" extension in " + element.getDeclaringExtension().getNamespaceIdentifier(), null); //$NON-NLS-1$
+			return true;
+		}
+		return false;
+	}
+
+	private synchronized IComponentImplFactory getComponentImplFactory(String typeID) {
+
+		ComponentImplDescriptor descriptor = (ComponentImplDescriptor) descriptors.get(typeID);
+		IComponentImplFactory factory = null;
+
+		if (descriptor != null) {
+
+			factory = (IComponentImplFactory) instances.get(descriptor);
+
+			if (factory == null) {
+
+				if ((factory = descriptor.createFactory()) != null) {
+					instances.put(descriptor, factory);
+				} else {
+					descriptors.remove(descriptor);
+				}
+			}
+		}
+		return factory;
+	}
+
+	// TODO Don't like this because it's going to cycle every project facet for each project
+	public IVirtualComponent createComponent(IProject project) {
+		try {
+			IFacetedProject facetedProject = ProjectFacetsManager.create(project);
+			Iterator keys = descriptors.keySet().iterator();
+			while (keys.hasNext()) {
+				String typeID = (String) keys.next();
+				try {
+					IProjectFacet projectFacet = ProjectFacetsManager.getProjectFacet(typeID);
+					if (projectFacet != null && facetedProject.hasProjectFacet(projectFacet)){
+						IComponentImplFactory factory = getComponentImplFactory(typeID);
+						if(null != factory){
+							return factory.createComponent(project);
+						}
+					}
+				} catch (Exception e) {
+					continue;
+				}
+			}
+		} catch (Exception e) {
+			// Just return a default component
+		}
+		return new VirtualComponent(project, new Path("/")); //$NON-NLS-1$
+	}
+
+	private class ComponentImplDescriptor {
+
+		private final IConfigurationElement element;
+		private final String type;
+
+		public ComponentImplDescriptor(IConfigurationElement configElement) {
+			element = configElement;
+			type = element.getAttribute(TYPE);
+		}
+
+		/**
+		 * Create and return an {@link IArtifactEditFactory} for the given descriptor or <b>null</b>
+		 * if there are problems instantiating the extension.
+		 * 
+		 * @return An {@link IArtifactEditFactory} for the given descriptor or <b>null</b> if there
+		 *         are problems instantiating the extension.
+		 */
+		public IComponentImplFactory createFactory() {
+
+			final IComponentImplFactory[] factory = new IComponentImplFactory[1];
+
+			SafeRunner.run(new ISafeRunnable() {
+
+				public void handleException(Throwable exception) {
+					ModulecorePlugin.logError(0, exception.getMessage(), exception);
+				}
+
+				public void run() throws Exception {
+					factory[0] = (IComponentImplFactory) element.createExecutableExtension(CLASS);
+				}
+
+			});
+
+			return factory[0];
+		}
+
+		/**
+		 * 
+		 * @return The type id of this ArtifactEdit definition
+		 */
+		public String getType() {
+			return type;
+		}
+
+	}
+
+}
diff --git a/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/util/IComponentImplFactory.java b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/util/IComponentImplFactory.java
new file mode 100644
index 0000000..381f4d4
--- /dev/null
+++ b/plugins/org.eclipse.wst.common.modulecore/modulecore-src/org/eclipse/wst/common/componentcore/internal/util/IComponentImplFactory.java
@@ -0,0 +1,20 @@
+/*******************************************************************************
+ * Copyright (c) 2003, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.wst.common.componentcore.internal.util;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
+
+public interface IComponentImplFactory {
+
+	public IVirtualComponent createComponent(IProject project);
+
+}
diff --git a/plugins/org.eclipse.wst.common.modulecore/plugin.xml b/plugins/org.eclipse.wst.common.modulecore/plugin.xml
index dcd1dd0..80cfe70 100644
--- a/plugins/org.eclipse.wst.common.modulecore/plugin.xml
+++ b/plugins/org.eclipse.wst.common.modulecore/plugin.xml
@@ -50,6 +50,7 @@
 	</extension>
 	<extension-point id="ComponentProjectMigrator" name="ComponentProjectMigrator" schema="schema/ComponentProjectMigrator.exsd"/>
 	<extension-point id="artifactedit" name="Component Artifact Edit" schema="schema/artifactedit.exsd"/>
+    <extension-point id="componentimpl" name="componentimpl" schema="schema/componentimpl.exsd"/>
 	
 	<!-- Contribute a URIResolverExtension for flexible projects -->
 	<extension point="org.eclipse.wst.common.uriresolver.resolverExtensions">
diff --git a/plugins/org.eclipse.wst.common.modulecore/schema/componentimpl.exsd b/plugins/org.eclipse.wst.common.modulecore/schema/componentimpl.exsd
new file mode 100644
index 0000000..2ec75cf
--- /dev/null
+++ b/plugins/org.eclipse.wst.common.modulecore/schema/componentimpl.exsd
@@ -0,0 +1,114 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Schema file written by PDE -->
+<schema targetNamespace="org.eclipse.wst.common.modulecore">
+<annotation>
+      <appInfo>
+         <meta.schema plugin="org.eclipse.wst.common.modulecore" id="componentimpl" name="componentimpl"/>
+      </appInfo>
+      <documentation>
+         [Enter description of this extension point.]
+      </documentation>
+   </annotation>
+
+   <element name="extension">
+      <complexType>
+         <sequence>
+         </sequence>
+         <attribute name="point" type="string" use="required">
+            <annotation>
+               <documentation>
+                  
+               </documentation>
+            </annotation>
+         </attribute>
+         <attribute name="id" type="string">
+            <annotation>
+               <documentation>
+                  
+               </documentation>
+            </annotation>
+         </attribute>
+         <attribute name="name" type="string">
+            <annotation>
+               <documentation>
+                  
+               </documentation>
+               <appInfo>
+                  <meta.attribute translatable="true"/>
+               </appInfo>
+            </annotation>
+         </attribute>
+      </complexType>
+   </element>
+
+   <element name="componentimpl">
+      <complexType>
+         <attribute name="typeID" type="string" use="required">
+            <annotation>
+               <documentation>
+                  
+               </documentation>
+            </annotation>
+         </attribute>
+         <attribute name="class" use="required">
+            <annotation>
+               <documentation>
+                  
+               </documentation>
+            </annotation>
+            <simpleType>
+               <restriction base="string">
+                  <enumeration value="instanceof IVirtualComponent">
+                  </enumeration>
+               </restriction>
+            </simpleType>
+         </attribute>
+      </complexType>
+   </element>
+
+   <annotation>
+      <appInfo>
+         <meta.section type="since"/>
+      </appInfo>
+      <documentation>
+         [Enter the first release in which this extension point appears.]
+      </documentation>
+   </annotation>
+
+   <annotation>
+      <appInfo>
+         <meta.section type="examples"/>
+      </appInfo>
+      <documentation>
+         [Enter extension point usage example here.]
+      </documentation>
+   </annotation>
+
+   <annotation>
+      <appInfo>
+         <meta.section type="apiInfo"/>
+      </appInfo>
+      <documentation>
+         [Enter API information here.]
+      </documentation>
+   </annotation>
+
+   <annotation>
+      <appInfo>
+         <meta.section type="implementation"/>
+      </appInfo>
+      <documentation>
+         [Enter information about supplied implementation of this extension point.]
+      </documentation>
+   </annotation>
+
+   <annotation>
+      <appInfo>
+         <meta.section type="copyright"/>
+      </appInfo>
+      <documentation>
+         
+      </documentation>
+   </annotation>
+
+</schema>