| /******************************************************************************* |
| * Copyright (c) 2003, 2008 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.ui.internal.ide; |
| |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.eclipse.core.resources.IProject; |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.resources.IResourceChangeEvent; |
| import org.eclipse.core.resources.IResourceChangeListener; |
| import org.eclipse.core.resources.IResourceDelta; |
| import org.eclipse.core.resources.ResourcesPlugin; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.IRegistryChangeEvent; |
| import org.eclipse.core.runtime.IRegistryChangeListener; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.ui.IPluginContribution; |
| import org.eclipse.ui.PlatformUI; |
| import org.eclipse.ui.activities.ITriggerPoint; |
| import org.eclipse.ui.activities.IWorkbenchActivitySupport; |
| import org.eclipse.ui.activities.WorkbenchActivityHelper; |
| import org.eclipse.ui.progress.WorkbenchJob; |
| |
| /** |
| * Utility class that manages promotion of activites in response to workspace changes. |
| * |
| * @since 3.0 |
| */ |
| public class IDEWorkbenchActivityHelper { |
| |
| private static final String NATURE_POINT = "org.eclipse.ui.ide.natures"; //$NON-NLS-1$ |
| |
| /** |
| * Resource listener that reacts to new projects (and associated natures) |
| * coming into the workspace. |
| */ |
| private IResourceChangeListener listener; |
| |
| /** |
| * Mapping from composite nature ID to IPluginContribution. Used for proper |
| * activity mapping of natures. |
| */ |
| private Map natureMap; |
| |
| /** |
| * Lock for the list of nature ids to be processed. |
| */ |
| private final IDEWorkbenchActivityHelper lock; |
| |
| /** |
| * The update job. |
| */ |
| private WorkbenchJob fUpdateJob; |
| |
| /** |
| * The collection of natures to process. |
| */ |
| private HashSet fPendingNatureUpdates= new HashSet(); |
| |
| /** |
| * Singleton instance. |
| */ |
| private static IDEWorkbenchActivityHelper singleton; |
| |
| /** |
| * Get the singleton instance of this class. |
| * @return the singleton instance of this class. |
| * @since 3.0 |
| */ |
| public static IDEWorkbenchActivityHelper getInstance() { |
| if (singleton == null) { |
| singleton = new IDEWorkbenchActivityHelper(); |
| } |
| return singleton; |
| } |
| |
| /** |
| * Create a new <code>IDEWorkbenchActivityHelper</code> which will listen |
| * for workspace changes and promote activities accordingly. |
| */ |
| private IDEWorkbenchActivityHelper() { |
| lock = this; |
| natureMap = new HashMap(); |
| // for dynamic UI |
| Platform.getExtensionRegistry().addRegistryChangeListener( |
| new IRegistryChangeListener() { |
| @Override |
| public void registryChanged(IRegistryChangeEvent event) { |
| if (event.getExtensionDeltas( |
| "org.eclipse.core.resources", "natures").length > 0) { //$NON-NLS-1$ //$NON-NLS-2$ |
| loadNatures(); |
| } |
| } |
| }, "org.eclipse.core.resources"); //$NON-NLS-1$ |
| loadNatures(); |
| listener = getChangeListener(); |
| ResourcesPlugin.getWorkspace().addResourceChangeListener(listener); |
| // crawl the initial projects to set up nature bindings |
| IProject[] projects = ResourcesPlugin.getWorkspace().getRoot() |
| .getProjects(); |
| processProjects(new HashSet(Arrays.asList(projects))); |
| } |
| |
| /** |
| * For dynamic UI. Clears the cache of known natures and recreates it. |
| */ |
| public void loadNatures() { |
| natureMap.clear(); |
| IExtensionPoint point = Platform.getExtensionRegistry() |
| .getExtensionPoint("org.eclipse.core.resources.natures"); //$NON-NLS-1$ |
| IExtension[] extensions = point.getExtensions(); |
| for (int i = 0; i < extensions.length; i++) { |
| IExtension extension = extensions[i]; |
| final String localId = extension.getSimpleIdentifier(); |
| final String pluginId = extension.getNamespaceIdentifier(); |
| String natureId = extension.getUniqueIdentifier(); |
| natureMap.put(natureId, new IPluginContribution() { |
| @Override |
| public String getLocalId() { |
| return localId; |
| } |
| |
| @Override |
| public String getPluginId() { |
| return pluginId; |
| } |
| }); |
| } |
| } |
| |
| /** |
| * Get a change listener for listening to resource changes. |
| * |
| * @return the resource change listeners |
| */ |
| private IResourceChangeListener getChangeListener() { |
| return new IResourceChangeListener() { |
| @Override |
| public void resourceChanged(IResourceChangeEvent event) { |
| if (!WorkbenchActivityHelper.isFiltering()) { |
| return; |
| } |
| IResourceDelta mainDelta = event.getDelta(); |
| |
| if (mainDelta == null) { |
| return; |
| } |
| //Has the root changed? |
| if (mainDelta.getKind() == IResourceDelta.CHANGED |
| && mainDelta.getResource().getType() == IResource.ROOT) { |
| |
| IResourceDelta[] children = mainDelta.getAffectedChildren(); |
| Set projectsToUpdate = new HashSet(); |
| for (int i = 0; i < children.length; i++) { |
| IResourceDelta delta = children[i]; |
| if (delta.getResource().getType() == IResource.PROJECT) { |
| IProject project = (IProject) delta.getResource(); |
| |
| if (project.isOpen()) { |
| projectsToUpdate.add(project); |
| } |
| } |
| } |
| |
| processProjects(projectsToUpdate); |
| } |
| } |
| }; |
| } |
| |
| |
| /** |
| * Drain the queue and consult the helper. |
| */ |
| protected void runPendingUpdates() { |
| String[] ids = null; |
| synchronized (lock) { |
| ids = (String[]) fPendingNatureUpdates |
| .toArray(new String[fPendingNatureUpdates.size()]); |
| fPendingNatureUpdates.clear(); |
| } |
| IWorkbenchActivitySupport workbenchActivitySupport = PlatformUI |
| .getWorkbench().getActivitySupport(); |
| for (int j = 0; j < ids.length; j++) { |
| final IPluginContribution contribution = (IPluginContribution) natureMap |
| .get(ids[j]); |
| if (contribution == null) { |
| continue; // bad nature ID. |
| } |
| |
| final ITriggerPoint triggerPoint = workbenchActivitySupport |
| .getTriggerPointManager().getTriggerPoint(NATURE_POINT); |
| // consult the advisor - if the activities need enabling, they will |
| // be |
| WorkbenchActivityHelper.allowUseOf(triggerPoint, contribution); |
| } |
| |
| } |
| |
| /** |
| * Unhooks the <code>IResourceChangeListener</code>. |
| */ |
| public void shutdown() { |
| if (listener != null) { |
| ResourcesPlugin.getWorkspace().removeResourceChangeListener( |
| listener); |
| } |
| } |
| |
| /** |
| * @param projectsToUpdate |
| */ |
| private void processProjects(Set projectsToUpdate) { |
| boolean needsUpdate = false; |
| for (Iterator i = projectsToUpdate.iterator(); i.hasNext();) { |
| try { |
| IProject project = (IProject) i.next(); |
| String[] ids = project.getDescription().getNatureIds(); |
| if (ids.length == 0) { |
| continue; |
| } |
| |
| synchronized (lock) { |
| needsUpdate = fPendingNatureUpdates.addAll(Arrays |
| .asList(ids)) | needsUpdate; |
| } |
| |
| } catch (CoreException e) { |
| // Do nothing if there is a CoreException |
| } |
| } |
| if (needsUpdate) { |
| if (fUpdateJob == null) { |
| fUpdateJob = new WorkbenchJob(IDEWorkbenchMessages.IDEWorkbenchActivityHelper_jobName) { |
| @Override |
| public IStatus runInUIThread( |
| IProgressMonitor monitor) { |
| runPendingUpdates(); |
| return Status.OK_STATUS; |
| } |
| }; |
| fUpdateJob.setSystem(true); |
| } |
| fUpdateJob.schedule(); |
| } |
| } |
| } |