/*******************************************************************************
* Copyright (c) 2008, 2010 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
*
* Provisional API: This class/interface is part of an interim API that is still under development and expected to
* change significantly before reaching stability. It is being made available at this early stage to solicit feedback
* from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
* (repeatedly) as the API evolves.
*
*
*******************************************************************************/
package org.eclipse.wst.jsdt.web.core.javascript;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.wst.jsdt.core.IJavaScriptProject;
import org.eclipse.wst.jsdt.core.JavaScriptCore;
import org.eclipse.wst.jsdt.web.core.internal.Logger;
import org.eclipse.wst.sse.core.internal.provisional.INodeAdapter;
import org.eclipse.wst.sse.core.internal.provisional.INodeNotifier;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
/**
*
* Provisional API: This class/interface is part of an interim API that is still under development and expected to
* change significantly before reaching stability. It is being made available at this early stage to solicit feedback
* from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
* (repeatedly) as the API evolves.
* <br><br> this adapter loads translation information from extension points. this is to allow more complicated html/js translations through extensions.
* @author pavery
*/
public class JsTranslationAdapter implements INodeAdapter, IResourceChangeListener {
private static final boolean DEBUG = "true".equalsIgnoreCase(Platform.getDebugOption("org.eclipse.wst.jsdt.web.core/debug/jstranslation")); //$NON-NLS-1$ //$NON-NLS-2$
private IStructuredDocument fHtmlDocument = null;
private IJsTranslation fJSTranslation = null;
private NullProgressMonitor fTranslationMonitor = null;
private String baseLocation;
private boolean listenForChanges=false;
private static final String PRIORITY_ATTRIB = "priority";
private IJsTranslation fTranslationAsFactory;
public JsTranslationAdapter(IDOMModel xmlModel) {
fHtmlDocument = xmlModel.getStructuredDocument();
baseLocation = xmlModel.getBaseLocation();
initializeJavaPlugins();
}
public void shouldListenForChanges(boolean listenForProjectChanges) {
if(listenForProjectChanges) {
ResourcesPlugin.getWorkspace().addResourceChangeListener(this, IResourceChangeEvent.POST_CHANGE);
}
}
public IJavaScriptProject getJavaProject() {
IJavaScriptProject javaProject = null;
IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
IPath filePath = new Path(baseLocation);
IProject project = null;
if (filePath.segmentCount() > 0) {
project = root.getProject(filePath.segment(0));
}
if (project != null) {
javaProject = JavaScriptCore.create(project);
}
return javaProject;
}
/**
* Returns the IJsTranslation for this adapter.
*
* @return a IJsTranslation
*/
public IJsTranslation getJsTranslation(boolean listenForChanges) {
/*
* If no translation exists or switching from not listening to
* listening
*/
if (fJSTranslation == null || (!this.listenForChanges && listenForChanges)) {
if (fJSTranslation != null)
fJSTranslation.release();
if (fTranslationAsFactory == null) {
/* load the translation factory from the extension point */
try {
IExtensionRegistry registry = Platform.getExtensionRegistry();
IExtensionPoint extensionPoint = registry.getExtensionPoint("org.eclipse.wst.jsdt.web.core.javascriptPreProcessor");
IConfigurationElement points[] = extensionPoint.getConfigurationElements();
int highestPriorityValue = -1;
int highestPriorityIndex = -1;
for (int i = 0; i < points.length; i++) {
String priority = points[i].getAttribute(PRIORITY_ATTRIB);
int value = Integer.parseInt(priority);
if (value > highestPriorityValue) {
highestPriorityIndex = i;
highestPriorityValue = value;
}
}
fTranslationAsFactory = (IJsTranslation) points[highestPriorityIndex].createExecutableExtension("class");
}
catch (Exception e) {
Logger.logException(e);
}
}
if (fTranslationAsFactory != null) {
fJSTranslation = fTranslationAsFactory.getInstance(fHtmlDocument, getJavaProject(), listenForChanges);
}
else {
fJSTranslation = new JsTranslation(fHtmlDocument, getJavaProject(), listenForChanges);
}
this.listenForChanges = listenForChanges;
}
shouldListenForChanges(listenForChanges);
return fJSTranslation;
}
private void initializeJavaPlugins() {
JavaScriptCore.getPlugin();
}
public boolean isAdapterForType(Object type) {
return type.equals(IJsTranslation.class);
}
public void notifyChanged(INodeNotifier notifier, int eventType, Object changedFeature, Object oldValue, Object newValue, int pos) {}
public void release() {
if (fTranslationMonitor != null) {
fTranslationMonitor.setCanceled(true);
}
ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
if (fJSTranslation != null) {
if (JsTranslationAdapter.DEBUG) {
System.out.println("JSTranslationAdapter releasing:" + fJSTranslation); //$NON-NLS-1$
}
fJSTranslation.release();
}
}
/* (non-Javadoc)
* @see org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org.eclipse.core.resources.IResourceChangeEvent)
*/
public void resourceChanged(IResourceChangeEvent event) {
IProject changedProject = (event==null || event.getResource()==null)?null:event.getResource().getProject();
if(changedProject!=null && getJavaProject().getProject().equals(changedProject) && fJSTranslation!=null){
fJSTranslation.classpathChange();
}
}
}