Java tutorial
/******************************************************************************* * Copyright (c) 2000, 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 *******************************************************************************/ package com.siteview.mde.internal.core; import java.io.*; import java.util.*; import org.eclipse.core.resources.*; import org.eclipse.core.runtime.*; import org.eclipse.jdt.core.*; import org.eclipse.jdt.launching.JavaRuntime; import org.eclipse.osgi.util.NLS; import com.siteview.mde.core.monitor.*; import com.siteview.mde.internal.core.util.CoreUtility; /** * This class manages the ability of external plug-ins in the model manager to * take part in the Java search. It manages a proxy Java projects and for each * external plug-in added to Java search, it adds its Java libraries as external * JARs to the proxy project. This makes the libraries visible to the Java * model, and they can take part in various Java searches. */ public class SearchablePluginsManager implements IFileAdapterFactory, IMonitorModelListener, ISaveParticipant { private static final String PROXY_FILE_NAME = ".searchable"; //$NON-NLS-1$ public static final String PROXY_PROJECT_NAME = "External Plug-in Libraries"; //$NON-NLS-1$ private static final String KEY = "searchablePlugins"; //$NON-NLS-1$ private Listener fElementListener; private Set fPluginIdSet; private ArrayList fListeners; class Listener implements IElementChangedListener { public void elementChanged(ElementChangedEvent e) { if (e.getType() == ElementChangedEvent.POST_CHANGE) { handleDelta(e.getDelta()); } } private boolean handleDelta(IJavaElementDelta delta) { Object element = delta.getElement(); if (element instanceof IJavaModel) { IJavaElementDelta[] projectDeltas = delta.getAffectedChildren(); for (int i = 0; i < projectDeltas.length; i++) { if (handleDelta(projectDeltas[i])) break; } return true; } if (delta.getElement() instanceof IJavaProject) { IJavaProject project = (IJavaProject) delta.getElement(); if (project.getElementName().equals(PROXY_PROJECT_NAME)) { if (delta.getKind() == IJavaElementDelta.REMOVED) { fPluginIdSet.clear(); } else if (delta.getKind() == IJavaElementDelta.ADDED) { // We may be getting a queued delta from when the manager was initialized, ignore unless we don't already have data if (fPluginIdSet == null || fPluginIdSet.size() == 0) { // Something other than the manager created the project, check if it has a .searchable file to load from initializeStates(); } } } return true; } return false; } } public SearchablePluginsManager() { initializeStates(); fElementListener = new Listener(); JavaCore.addElementChangedListener(fElementListener); MDECore.getDefault().getModelManager().addPluginModelListener(this); } private void initializeStates() { fPluginIdSet = new TreeSet(); IWorkspaceRoot root = MDECore.getWorkspace().getRoot(); IProject project = root.getProject(PROXY_PROJECT_NAME); try { if (project.exists() && project.isOpen()) { IFile proxyFile = project.getFile(PROXY_FILE_NAME); if (proxyFile.exists()) { Properties properties = new Properties(); InputStream stream = proxyFile.getContents(true); properties.load(stream); stream.close(); String value = properties.getProperty(KEY); if (value != null) { StringTokenizer stok = new StringTokenizer(value, ","); //$NON-NLS-1$ while (stok.hasMoreTokens()) fPluginIdSet.add(stok.nextToken()); } } } } catch (IOException e) { } catch (CoreException e) { } } public IJavaProject getProxyProject() { IWorkspaceRoot root = MDECore.getWorkspace().getRoot(); IProject project = root.getProject(PROXY_PROJECT_NAME); try { if (project.exists() && project.isOpen() && project.hasNature(JavaCore.NATURE_ID)) { return JavaCore.create(project); } } catch (CoreException e) { } return null; } public void shutdown() { // remove listener JavaCore.removeElementChangedListener(fElementListener); MDECore.getDefault().getModelManager().removePluginModelListener(this); if (fListeners != null) fListeners.clear(); } public IClasspathEntry[] computeContainerClasspathEntries() throws CoreException { ArrayList result = new ArrayList(); IMonitorModelBase[] wModels = MonitorRegistry.getWorkspaceModels(); for (int i = 0; i < wModels.length; i++) { IProject project = wModels[i].getUnderlyingResource().getProject(); if (project.hasNature(JavaCore.NATURE_ID)) { result.add(JavaCore.newProjectEntry(project.getFullPath())); } } Iterator iter = fPluginIdSet.iterator(); while (iter.hasNext()) { ModelEntry entry = MonitorRegistry.findEntry(iter.next().toString()); if (entry != null) { boolean addModel = true; wModels = entry.getWorkspaceModels(); for (int i = 0; i < wModels.length; i++) { IProject project = wModels[i].getUnderlyingResource().getProject(); if (project.hasNature(JavaCore.NATURE_ID)) addModel = false; } if (!addModel) continue; IMonitorModelBase[] models = entry.getExternalModels(); for (int i = 0; i < models.length; i++) { if (models[i].isEnabled()) ClasspathUtilCore.addLibraries(models[i], result); } } } if (result.size() > 1) { // sort Map map = new TreeMap(); for (int i = 0; i < result.size(); i++) { IClasspathEntry entry = (IClasspathEntry) result.get(i); String key = entry.getPath().lastSegment().toString(); if (map.containsKey(key)) { key += System.currentTimeMillis(); } map.put(key, entry); } return (IClasspathEntry[]) map.values().toArray(new IClasspathEntry[map.size()]); } return (IClasspathEntry[]) result.toArray(new IClasspathEntry[result.size()]); } public Object createAdapterChild(FileAdapter parent, File file) { if (!file.isDirectory()) { String name = file.getName().toLowerCase(Locale.ENGLISH); if (name.endsWith(".jar")) { //$NON-NLS-1$ IPackageFragmentRoot root = findPackageFragmentRoot(new Path(file.getAbsolutePath())); if (root != null) return root; } } return new FileAdapter(parent, file, this); } private IPackageFragmentRoot findPackageFragmentRoot(IPath jarPath) { IJavaProject jProject = getProxyProject(); if (jProject != null) { try { IPackageFragmentRoot[] roots = jProject.getAllPackageFragmentRoots(); for (int i = 0; i < roots.length; i++) { IPackageFragmentRoot root = roots[i]; IPath path = root.getPath(); if (path.equals(jarPath)) return root; } } catch (JavaModelException e) { } } // Find in other plug-in (and fragments) projects dependencies IMonitorModelBase[] pluginModels = MonitorRegistry.getWorkspaceModels(); for (int i = 0; i < pluginModels.length; i++) { IProject project = pluginModels[i].getUnderlyingResource().getProject(); IJavaProject javaProject = JavaCore.create(project); try { IPackageFragmentRoot[] roots = javaProject.getAllPackageFragmentRoots(); for (int j = 0; j < roots.length; j++) { IPackageFragmentRoot root = roots[j]; IPath path = root.getPath(); if (path.equals(jarPath)) return root; } } catch (JavaModelException e) { } } return null; } private void checkForProxyProject() { IWorkspaceRoot root = MDECore.getWorkspace().getRoot(); try { IProject project = root.getProject(SearchablePluginsManager.PROXY_PROJECT_NAME); if (!project.exists()) createProxyProject(new NullProgressMonitor()); } catch (CoreException e) { } } public void addToJavaSearch(IMonitorModelBase[] models) { checkForProxyProject(); MonitorModelDelta delta = new MonitorModelDelta(); int size = fPluginIdSet.size(); for (int i = 0; i < models.length; i++) { String id = models[i].getMonitorBase().getId(); if (fPluginIdSet.add(id)) { ModelEntry entry = MonitorRegistry.findEntry(id); if (entry != null) delta.addEntry(entry, MonitorModelDelta.CHANGED); } } if (fPluginIdSet.size() > size) { resetContainer(); fireDelta(delta); } } public void removeFromJavaSearch(IMonitorModelBase[] models) { MonitorModelDelta delta = new MonitorModelDelta(); int size = fPluginIdSet.size(); for (int i = 0; i < models.length; i++) { String id = models[i].getMonitorBase().getId(); if (fPluginIdSet.remove(id)) { ModelEntry entry = MonitorRegistry.findEntry(id); if (entry != null) { delta.addEntry(entry, MonitorModelDelta.CHANGED); } } } if (fPluginIdSet.size() < size) { resetContainer(); fireDelta(delta); } } public void removeAllFromJavaSearch() { if (fPluginIdSet.size() > 0) { MonitorModelDelta delta = new MonitorModelDelta(); for (Iterator iterator = fPluginIdSet.iterator(); iterator.hasNext();) { String id = (String) iterator.next(); ModelEntry entry = MonitorRegistry.findEntry(id); if (entry != null) { delta.addEntry(entry, MonitorModelDelta.CHANGED); } } fPluginIdSet.clear(); resetContainer(); fireDelta(delta); } } public boolean isInJavaSearch(String symbolicName) { return fPluginIdSet.contains(symbolicName); } private void resetContainer() { IJavaProject jProject = getProxyProject(); try { if (jProject != null) { JavaCore.setClasspathContainer(MDECore.JAVA_SEARCH_CONTAINER_PATH, new IJavaProject[] { jProject }, new IClasspathContainer[] { new ExternalJavaSearchClasspathContainer() }, null); } } catch (JavaModelException e) { } } public void modelsChanged(MonitorModelDelta delta) { ModelEntry[] entries = delta.getRemovedEntries(); for (int i = 0; i < entries.length; i++) { if (fPluginIdSet.contains(entries[i].getId())) { fPluginIdSet.remove(entries[i].getId()); } } resetContainer(); } private void fireDelta(MonitorModelDelta delta) { if (fListeners != null) { for (int i = 0; i < fListeners.size(); i++) { ((IMonitorModelListener) fListeners.get(i)).modelsChanged(delta); } } } public void addPluginModelListener(IMonitorModelListener listener) { if (fListeners == null) fListeners = new ArrayList(); if (!fListeners.contains(listener)) fListeners.add(listener); } public void removePluginModelListener(IMonitorModelListener listener) { if (fListeners != null) fListeners.remove(listener); } public void doneSaving(ISaveContext context) { // nothing is required here } public void prepareToSave(ISaveContext context) { // no need for preparation } public void rollback(ISaveContext context) { // do nothing. not the end of the world. } public void saving(ISaveContext context) throws CoreException { if (context.getKind() != ISaveContext.FULL_SAVE) return; // persist state IWorkspaceRoot root = MDECore.getWorkspace().getRoot(); IProject project = root.getProject(PROXY_PROJECT_NAME); if (project.exists() && project.isOpen()) { IFile file = project.getFile(PROXY_FILE_NAME); Properties properties = new Properties(); StringBuffer buffer = new StringBuffer(); Iterator iter = fPluginIdSet.iterator(); while (iter.hasNext()) { if (buffer.length() > 0) buffer.append(","); //$NON-NLS-1$ buffer.append(iter.next().toString()); } properties.setProperty(KEY, buffer.toString()); try { ByteArrayOutputStream outStream = new ByteArrayOutputStream(); properties.store(outStream, ""); //$NON-NLS-1$ outStream.flush(); outStream.close(); ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray()); if (file.exists()) file.setContents(inStream, true, false, new NullProgressMonitor()); else file.create(inStream, true, new NullProgressMonitor()); inStream.close(); } catch (IOException e) { MDECore.log(e); } } } public IProject createProxyProject(IProgressMonitor monitor) throws CoreException { IWorkspaceRoot root = MDECore.getWorkspace().getRoot(); IProject project = root.getProject(SearchablePluginsManager.PROXY_PROJECT_NAME); if (project.exists()) { if (!project.isOpen()) { project.open(monitor); } return project; } monitor.beginTask(NLS.bind(MDECoreMessages.SearchablePluginsManager_createProjectTaskName, SearchablePluginsManager.PROXY_PROJECT_NAME), 5); project.create(new SubProgressMonitor(monitor, 1)); project.open(new SubProgressMonitor(monitor, 1)); CoreUtility.addNatureToProject(project, JavaCore.NATURE_ID, new SubProgressMonitor(monitor, 1)); IJavaProject jProject = JavaCore.create(project); jProject.setOutputLocation(project.getFullPath(), new SubProgressMonitor(monitor, 1)); computeClasspath(jProject, new SubProgressMonitor(monitor, 1)); return project; } private void computeClasspath(IJavaProject project, IProgressMonitor monitor) { IClasspathEntry[] classpath = new IClasspathEntry[2]; classpath[0] = JavaCore.newContainerEntry(JavaRuntime.newDefaultJREContainerPath()); classpath[1] = JavaCore.newContainerEntry(MDECore.JAVA_SEARCH_CONTAINER_PATH); try { project.setRawClasspath(classpath, monitor); } catch (JavaModelException e) { } } }