bundles/org.eclipse.wst.jsdt.web.core/src/org/eclipse/wst/jsdt/web/core/internal/contentproperties/JSPFContentPropertiesManager.java - sourceediting/webtools.sourceediting - Git at Google

 /*******************************************************************************
  * Copyright (c) 2006 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.jsdt.web.core.internal.contentproperties;

 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;

 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResourceChangeEvent;
 import org.eclipse.core.resources.IResourceChangeListener;
 import org.eclipse.core.resources.IResourceDelta;
 import org.eclipse.core.resources.IResourceStatus;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.MultiStatus;
 import org.eclipse.core.runtime.NullProgressMonitor;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.wst.jsdt.web.core.internal.JSPCoreMessages;
 import org.eclipse.wst.jsdt.web.core.internal.Logger;
 import org.osgi.framework.Bundle;
 import org.osgi.service.prefs.BackingStoreException;
 import org.osgi.service.prefs.Preferences;

 public class JSPFContentPropertiesManager {
 	/**
 	 * This job implementation is used to allow the resource change listener to
 	 * schedule operations that need to modify the workspace.
 	 */
 	private class ContentPropertiesManagerJob extends Job {
 		private static final int PROPERTIES_UPDATE_DELAY = 500;
 		private List			 asyncChanges			= new ArrayList();

 		public ContentPropertiesManagerJob() {
 			super(JSPCoreMessages.JSPFContentPropertiesManager_Updating);
 			setSystem(true);
 			setPriority(Job.INTERACTIVE);
 		}

 		public void addChanges(Set newChanges) {
 			if (newChanges.isEmpty()) {
 				return;
 			}
 			synchronized (asyncChanges) {
 				asyncChanges.addAll(newChanges);
 				asyncChanges.notify();
 			}
 			schedule(ContentPropertiesManagerJob.PROPERTIES_UPDATE_DELAY);
 		}

 		public IProject getNextChange() {
 			synchronized (asyncChanges) {
 				return asyncChanges.isEmpty() ? null : (IProject) asyncChanges.remove(asyncChanges.size() - 1);
 			}
 		}

 		@Override
 		protected IStatus run(IProgressMonitor monitor) {
 			MultiStatus result = new MultiStatus(JSPFContentProperties.JSPCORE_ID, IResourceStatus.FAILED_SETTING_CHARSET, JSPCoreMessages.JSPFContentPropertiesManager_Updating, null);
 			monitor = monitor == null ? new NullProgressMonitor() : monitor;
 			try {
 				monitor.beginTask(JSPCoreMessages.JSPFContentPropertiesManager_Updating, asyncChanges.size());
 				try {
 					IProject next;
 					while ((next = getNextChange()) != null) {
 						// just exit if the system is shutting down or has
 						// been shut down
 						// it is too late to change the workspace at this
 						// point anyway
 						if (Platform.getBundle("org.eclipse.osgi").getState() != Bundle.ACTIVE) {
 							return Status.OK_STATUS;
 						}
 						try {
 							// save the preferences nodes
 							if (next.isAccessible()) {
 								// save content type preferences
 								Preferences projectPrefs = JSPFContentProperties.getPreferences(next, JSPFContentProperties.JSPCONTENTTYPE, false);
 								if (projectPrefs != null) {
 									projectPrefs.flush();
 								}
 								// save language preferences
 								projectPrefs = JSPFContentProperties.getPreferences(next, JSPFContentProperties.JSPLANGUAGE, false);
 								if (projectPrefs != null) {
 									projectPrefs.flush();
 								}

 							}
 						} catch (BackingStoreException e) {
 							// we got an error saving
 							String detailMessage = NLS.bind(JSPCoreMessages.JSPFContentPropertiesManager_Problems_Updating, next.getFullPath());
 							result.add(new Status(1 << (IResourceStatus.FAILED_SETTING_CHARSET % 100 / 33), ResourcesPlugin.PI_RESOURCES, IResourceStatus.FAILED_SETTING_CHARSET, detailMessage, e));
 						}
 					}
 					monitor.worked(1);
 				} catch (OperationCanceledException e) {
 					throw e;
 				}
 			} finally {
 				monitor.done();
 			}
 			return result;
 		}

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see org.eclipse.core.runtime.jobs.Job#shouldRun()
 		 */
 		@Override
 		public boolean shouldRun() {
 			synchronized (asyncChanges) {
 				return !asyncChanges.isEmpty();
 			}
 		}
 	}

 	class ResourceChangeListener implements IResourceChangeListener {
 		private void processEntryChanges(IResourceDelta projectDelta, Set projectsToSave) {
 			// check each resource with jsp fragment setting to see if it has
 			// been moved/deleted
 			boolean resourceChanges = false;
 			boolean resourceChanges2 = false;

 			// project affected
 			IProject currentProject = (IProject) projectDelta.getResource();

 			resourceChanges = processPreferences(currentProject, JSPFContentProperties.JSPCONTENTTYPE, projectDelta, projectsToSave);
 			resourceChanges2 = processPreferences(currentProject, JSPFContentProperties.JSPLANGUAGE, projectDelta, projectsToSave);

 			// if there was a preference key change, need to save preferences
 			if (resourceChanges || resourceChanges2) {
 				projectsToSave.add(currentProject);
 			}
 		}

 		/**
 		 * Goes through all the resource-dependent preferences associated with
 		 * currentProject & key and updates the preference keys if needed based
 		 * on projectDelta
 		 *
 		 * @param currentProject
 		 *            current project of the preferences to be looked at
 		 * @param key
 		 *            current key/subcategory of the preferences to be looked at
 		 * @param projectDelta
 		 *            the changes to process the preference keys against
 		 * @param projectsToSave
 		 *            the projects that need to be updated/saved
 		 * @return true if currentProject's preferences were modified
 		 */
 		private boolean processPreferences(IProject currentProject, String key, IResourceDelta projectDelta, Set projectsToSave) {
 			boolean resourceChanges = false;

 			// get the project-key preference node
 			Preferences projectPrefs = JSPFContentProperties.getPreferences(currentProject, key, false);
 			if (projectPrefs == null) {
 				// no preferences for this project-key, just bail
 				return false;
 			}
 			String[] affectedResources;
 			try {
 				affectedResources = projectPrefs.keys();
 			} catch (BackingStoreException e) {
 				// problems with the project scope... we gonna miss the
 				// changes (but will log)
 				Logger.log(Logger.WARNING_DEBUG, "Problem retreiving JSP Fragment preferences", e); //$NON-NLS-1$
 				return false;
 			}

 			// go through each preference key (which is really a file name)
 			for (int i = 0; i < affectedResources.length; i++) {
 				// see if preference key/file name was file that was changed
 				IResourceDelta memberDelta = projectDelta.findMember(new Path(affectedResources[i]));
 				// no changes for the given resource
 				if (memberDelta == null) {
 					continue;
 				}
 				if (memberDelta.getKind() == IResourceDelta.REMOVED) {
 					resourceChanges = true;
 					// remove the setting for the original location
 					String currentValue = projectPrefs.get(affectedResources[i], null);
 					projectPrefs.remove(affectedResources[i]);
 					if ((memberDelta.getFlags() & IResourceDelta.MOVED_TO) != 0) {
 						// if moving, copy the setting for the new location
 						IProject targetProject = ResourcesPlugin.getWorkspace().getRoot().getProject(memberDelta.getMovedToPath().segment(0));
 						Preferences targetPrefs = JSPFContentProperties.getPreferences(targetProject, key, true);
 						targetPrefs.put(JSPFContentProperties.getKeyFor(memberDelta.getMovedToPath()), currentValue);
 						if (targetProject != currentProject) {
 							projectsToSave.add(targetProject);
 						}
 					}
 				}
 			}
 			return resourceChanges;
 		}

 		/**
 		 * For any change to the encoding file or any resource with encoding
 		 * set, just discard the cache for the corresponding project.
 		 */
 		public void resourceChanged(IResourceChangeEvent event) {
 			IResourceDelta delta = event.getDelta();
 			if (delta == null) {
 				return;
 			}
 			IResourceDelta[] projectDeltas = delta.getAffectedChildren();
 			// process each project in the delta
 			Set projectsToSave = new HashSet();
 			for (int i = 0; i < projectDeltas.length; i++) {
 				// nothing to do if a project has been added/removed/moved
 				if (projectDeltas[i].getKind() == IResourceDelta.CHANGED && (projectDeltas[i].getFlags() & IResourceDelta.OPEN) == 0) {
 					processEntryChanges(projectDeltas[i], projectsToSave);
 				}
 			}
 			fJob.addChanges(projectsToSave);
 		}
 	}

 	private static JSPFContentPropertiesManager _instance = null;

 	public synchronized static void shutdown() {
 		ResourcesPlugin.getWorkspace().removeResourceChangeListener(JSPFContentPropertiesManager._instance.fResourceChangeListener);
 		JSPFContentPropertiesManager._instance = null;
 	}

 	public synchronized static void startup() {
 		JSPFContentPropertiesManager._instance = new JSPFContentPropertiesManager();
 		ResourcesPlugin.getWorkspace().addResourceChangeListener(JSPFContentPropertiesManager._instance.fResourceChangeListener, IResourceChangeEvent.POST_CHANGE);
 	}

 	ContentPropertiesManagerJob	 fJob;

 	private IResourceChangeListener fResourceChangeListener;

 	public JSPFContentPropertiesManager() {
 		super();
 		fResourceChangeListener = new ResourceChangeListener();
 		fJob = new ContentPropertiesManagerJob();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2006 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.jsdt.web.core.internal.contentproperties;

	import java.util.ArrayList;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Set;

	import org.eclipse.core.resources.IProject;
	import org.eclipse.core.resources.IResourceChangeEvent;
	import org.eclipse.core.resources.IResourceChangeListener;
	import org.eclipse.core.resources.IResourceDelta;
	import org.eclipse.core.resources.IResourceStatus;
	import org.eclipse.core.resources.ResourcesPlugin;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.MultiStatus;
	import org.eclipse.core.runtime.NullProgressMonitor;
	import org.eclipse.core.runtime.OperationCanceledException;
	import org.eclipse.core.runtime.Path;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.core.runtime.jobs.Job;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.wst.jsdt.web.core.internal.JSPCoreMessages;
	import org.eclipse.wst.jsdt.web.core.internal.Logger;
	import org.osgi.framework.Bundle;
	import org.osgi.service.prefs.BackingStoreException;
	import org.osgi.service.prefs.Preferences;

	public class JSPFContentPropertiesManager {
	/**
	* This job implementation is used to allow the resource change listener to
	* schedule operations that need to modify the workspace.
	*/
	private class ContentPropertiesManagerJob extends Job {
	private static final int PROPERTIES_UPDATE_DELAY = 500;
	private List asyncChanges = new ArrayList();

	public ContentPropertiesManagerJob() {
	super(JSPCoreMessages.JSPFContentPropertiesManager_Updating);
	setSystem(true);
	setPriority(Job.INTERACTIVE);
	}

	public void addChanges(Set newChanges) {
	if (newChanges.isEmpty()) {
	return;
	}
	synchronized (asyncChanges) {
	asyncChanges.addAll(newChanges);
	asyncChanges.notify();
	}
	schedule(ContentPropertiesManagerJob.PROPERTIES_UPDATE_DELAY);
	}

	public IProject getNextChange() {
	synchronized (asyncChanges) {
	return asyncChanges.isEmpty() ? null : (IProject) asyncChanges.remove(asyncChanges.size() - 1);
	}
	}

	@Override
	protected IStatus run(IProgressMonitor monitor) {
	MultiStatus result = new MultiStatus(JSPFContentProperties.JSPCORE_ID, IResourceStatus.FAILED_SETTING_CHARSET, JSPCoreMessages.JSPFContentPropertiesManager_Updating, null);
	monitor = monitor == null ? new NullProgressMonitor() : monitor;
	try {
	monitor.beginTask(JSPCoreMessages.JSPFContentPropertiesManager_Updating, asyncChanges.size());
	try {
	IProject next;
	while ((next = getNextChange()) != null) {
	// just exit if the system is shutting down or has
	// been shut down
	// it is too late to change the workspace at this
	// point anyway
	if (Platform.getBundle("org.eclipse.osgi").getState() != Bundle.ACTIVE) {
	return Status.OK_STATUS;
	}
	try {
	// save the preferences nodes
	if (next.isAccessible()) {
	// save content type preferences
	Preferences projectPrefs = JSPFContentProperties.getPreferences(next, JSPFContentProperties.JSPCONTENTTYPE, false);
	if (projectPrefs != null) {
	projectPrefs.flush();
	}
	// save language preferences
	projectPrefs = JSPFContentProperties.getPreferences(next, JSPFContentProperties.JSPLANGUAGE, false);
	if (projectPrefs != null) {
	projectPrefs.flush();
	}

	}
	} catch (BackingStoreException e) {
	// we got an error saving
	String detailMessage = NLS.bind(JSPCoreMessages.JSPFContentPropertiesManager_Problems_Updating, next.getFullPath());
	result.add(new Status(1 << (IResourceStatus.FAILED_SETTING_CHARSET % 100 / 33), ResourcesPlugin.PI_RESOURCES, IResourceStatus.FAILED_SETTING_CHARSET, detailMessage, e));
	}
	}
	monitor.worked(1);
	} catch (OperationCanceledException e) {
	throw e;
	}
	} finally {
	monitor.done();
	}
	return result;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.core.runtime.jobs.Job#shouldRun()
	*/
	@Override
	public boolean shouldRun() {
	synchronized (asyncChanges) {
	return !asyncChanges.isEmpty();
	}
	}
	}

	class ResourceChangeListener implements IResourceChangeListener {
	private void processEntryChanges(IResourceDelta projectDelta, Set projectsToSave) {
	// check each resource with jsp fragment setting to see if it has
	// been moved/deleted
	boolean resourceChanges = false;
	boolean resourceChanges2 = false;

	// project affected
	IProject currentProject = (IProject) projectDelta.getResource();

	resourceChanges = processPreferences(currentProject, JSPFContentProperties.JSPCONTENTTYPE, projectDelta, projectsToSave);
	resourceChanges2 = processPreferences(currentProject, JSPFContentProperties.JSPLANGUAGE, projectDelta, projectsToSave);

	// if there was a preference key change, need to save preferences
	if (resourceChanges \|\| resourceChanges2) {
	projectsToSave.add(currentProject);
	}
	}

	/**
	* Goes through all the resource-dependent preferences associated with
	* currentProject & key and updates the preference keys if needed based
	* on projectDelta
	*
	* @param currentProject
	* current project of the preferences to be looked at
	* @param key
	* current key/subcategory of the preferences to be looked at
	* @param projectDelta
	* the changes to process the preference keys against
	* @param projectsToSave
	* the projects that need to be updated/saved
	* @return true if currentProject's preferences were modified
	*/
	private boolean processPreferences(IProject currentProject, String key, IResourceDelta projectDelta, Set projectsToSave) {
	boolean resourceChanges = false;

	// get the project-key preference node
	Preferences projectPrefs = JSPFContentProperties.getPreferences(currentProject, key, false);
	if (projectPrefs == null) {
	// no preferences for this project-key, just bail
	return false;
	}
	String[] affectedResources;
	try {
	affectedResources = projectPrefs.keys();
	} catch (BackingStoreException e) {
	// problems with the project scope... we gonna miss the
	// changes (but will log)
	Logger.log(Logger.WARNING_DEBUG, "Problem retreiving JSP Fragment preferences", e); //$NON-NLS-1$
	return false;
	}

	// go through each preference key (which is really a file name)
	for (int i = 0; i < affectedResources.length; i++) {
	// see if preference key/file name was file that was changed
	IResourceDelta memberDelta = projectDelta.findMember(new Path(affectedResources[i]));
	// no changes for the given resource
	if (memberDelta == null) {
	continue;
	}
	if (memberDelta.getKind() == IResourceDelta.REMOVED) {
	resourceChanges = true;
	// remove the setting for the original location
	String currentValue = projectPrefs.get(affectedResources[i], null);
	projectPrefs.remove(affectedResources[i]);
	if ((memberDelta.getFlags() & IResourceDelta.MOVED_TO) != 0) {
	// if moving, copy the setting for the new location
	IProject targetProject = ResourcesPlugin.getWorkspace().getRoot().getProject(memberDelta.getMovedToPath().segment(0));
	Preferences targetPrefs = JSPFContentProperties.getPreferences(targetProject, key, true);
	targetPrefs.put(JSPFContentProperties.getKeyFor(memberDelta.getMovedToPath()), currentValue);
	if (targetProject != currentProject) {
	projectsToSave.add(targetProject);
	}
	}
	}
	}
	return resourceChanges;
	}

	/**
	* For any change to the encoding file or any resource with encoding
	* set, just discard the cache for the corresponding project.
	*/
	public void resourceChanged(IResourceChangeEvent event) {
	IResourceDelta delta = event.getDelta();
	if (delta == null) {
	return;
	}
	IResourceDelta[] projectDeltas = delta.getAffectedChildren();
	// process each project in the delta
	Set projectsToSave = new HashSet();
	for (int i = 0; i < projectDeltas.length; i++) {
	// nothing to do if a project has been added/removed/moved
	if (projectDeltas[i].getKind() == IResourceDelta.CHANGED && (projectDeltas[i].getFlags() & IResourceDelta.OPEN) == 0) {
	processEntryChanges(projectDeltas[i], projectsToSave);
	}
	}
	fJob.addChanges(projectsToSave);
	}
	}

	private static JSPFContentPropertiesManager _instance = null;

	public synchronized static void shutdown() {
	ResourcesPlugin.getWorkspace().removeResourceChangeListener(JSPFContentPropertiesManager._instance.fResourceChangeListener);
	JSPFContentPropertiesManager._instance = null;
	}

	public synchronized static void startup() {
	JSPFContentPropertiesManager._instance = new JSPFContentPropertiesManager();
	ResourcesPlugin.getWorkspace().addResourceChangeListener(JSPFContentPropertiesManager._instance.fResourceChangeListener, IResourceChangeEvent.POST_CHANGE);
	}

	ContentPropertiesManagerJob fJob;

	private IResourceChangeListener fResourceChangeListener;

	public JSPFContentPropertiesManager() {
	super();
	fResourceChangeListener = new ResourceChangeListener();
	fJob = new ContentPropertiesManagerJob();
	}
	}