| /******************************************************************************* |
| * Copyright (c) 2004, 2009 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.core.internal.content; |
| |
| import java.io.InputStream; |
| import java.io.Reader; |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.core.runtime.content.*; |
| import org.eclipse.core.runtime.preferences.*; |
| |
| public class ContentTypeManager extends ContentTypeMatcher implements IContentTypeManager, IRegistryChangeListener { |
| private static ContentTypeManager instance; |
| |
| public static final int BLOCK_SIZE = 0x400; |
| public static final String CONTENT_TYPE_PREF_NODE = IContentConstants.RUNTIME_NAME + IPath.SEPARATOR + "content-types"; //$NON-NLS-1$ |
| private static final String OPTION_DEBUG_CONTENT_TYPES = "org.eclipse.core.contenttype/debug"; //$NON-NLS-1$; |
| static final boolean DEBUGGING = Activator.getDefault().getBooleanDebugOption(OPTION_DEBUG_CONTENT_TYPES, false); |
| private ContentTypeCatalog catalog; |
| private int catalogGeneration; |
| |
| /** |
| * List of registered listeners (element type: |
| * <code>IContentTypeChangeListener</code>). |
| * These listeners are to be informed when |
| * something in a content type changes. |
| */ |
| protected final ListenerList contentTypeListeners = new ListenerList(); |
| |
| /** |
| * Creates and initializes the platform's content type manager. A reference to the |
| * content type manager can later be obtained by calling <code>getInstance()</code>. |
| */ |
| // TODO we can remove this sometime, it is no longer needed |
| public static void startup() { |
| getInstance(); |
| } |
| |
| public static void addRegistryChangeListener(IExtensionRegistry registry) { |
| if (registry == null) |
| return; |
| registry.addRegistryChangeListener(getInstance(), IContentConstants.RUNTIME_NAME); |
| registry.addRegistryChangeListener(getInstance(), IContentConstants.CONTENT_NAME); |
| } |
| |
| /** |
| * Shuts down the platform's content type manager. After this call returns, |
| * the content type manager will be closed for business. |
| */ |
| public static void shutdown() { |
| // there really is nothing left to do except null the instance. |
| instance = null; |
| } |
| |
| public static void removeRegistryChangeListener(IExtensionRegistry registry) { |
| if (registry == null) |
| return; |
| getInstance().invalidate(); |
| registry.removeRegistryChangeListener(getInstance()); |
| } |
| |
| /** |
| * Obtains this platform's content type manager. |
| * |
| * @return the content type manager |
| */ |
| public static ContentTypeManager getInstance() { |
| if (instance == null) |
| instance = new ContentTypeManager(); |
| return instance; |
| } |
| |
| /* |
| * Returns the extension for a file name (omitting the leading '.'). |
| */ |
| static String getFileExtension(String fileName) { |
| int dotPosition = fileName.lastIndexOf('.'); |
| return (dotPosition == -1 || dotPosition == fileName.length() - 1) ? "" : fileName.substring(dotPosition + 1); //$NON-NLS-1$ |
| } |
| |
| protected static ILazySource readBuffer(InputStream contents) { |
| return new LazyInputStream(contents, BLOCK_SIZE); |
| } |
| |
| protected static ILazySource readBuffer(Reader contents) { |
| return new LazyReader(contents, BLOCK_SIZE); |
| } |
| |
| public ContentTypeManager() { |
| super(null, new InstanceScope()); |
| } |
| |
| protected ContentTypeBuilder createBuilder(ContentTypeCatalog newCatalog) { |
| return new ContentTypeBuilder(newCatalog); |
| } |
| |
| public IContentType[] getAllContentTypes() { |
| ContentTypeCatalog currentCatalog = getCatalog(); |
| IContentType[] types = currentCatalog.getAllContentTypes(); |
| IContentType[] result = new IContentType[types.length]; |
| int generation = currentCatalog.getGeneration(); |
| for (int i = 0; i < result.length; i++) |
| result[i] = new ContentTypeHandler((ContentType) types[i], generation); |
| return result; |
| } |
| |
| protected synchronized ContentTypeCatalog getCatalog() { |
| if (catalog != null) |
| // already has one |
| return catalog; |
| // create new catalog |
| ContentTypeCatalog newCatalog = new ContentTypeCatalog(this, catalogGeneration++); |
| // build catalog by parsing the extension registry |
| ContentTypeBuilder builder = createBuilder(newCatalog); |
| try { |
| builder.buildCatalog(); |
| // only remember catalog if building it was successful |
| catalog = newCatalog; |
| } catch (InvalidRegistryObjectException e) { |
| // the registry has stale objects... just don't remember the returned (incomplete) catalog |
| } |
| newCatalog.organize(); |
| return newCatalog; |
| } |
| |
| public IContentType getContentType(String contentTypeIdentifier) { |
| ContentTypeCatalog currentCatalog = getCatalog(); |
| ContentType type = currentCatalog.getContentType(contentTypeIdentifier); |
| return type == null ? null : new ContentTypeHandler(type, currentCatalog.getGeneration()); |
| } |
| |
| public IContentTypeMatcher getMatcher(final ISelectionPolicy customPolicy, final IScopeContext context) { |
| return new ContentTypeMatcher(customPolicy, context == null ? getContext() : context); |
| } |
| |
| IEclipsePreferences getPreferences() { |
| return getPreferences(getContext()); |
| } |
| |
| IEclipsePreferences getPreferences(IScopeContext context) { |
| return context.getNode(CONTENT_TYPE_PREF_NODE); |
| } |
| |
| public void registryChanged(IRegistryChangeEvent event) { |
| // no changes related to the content type registry |
| if (event.getExtensionDeltas(IContentConstants.RUNTIME_NAME, ContentTypeBuilder.PT_CONTENTTYPES).length == 0 && |
| event.getExtensionDeltas(IContentConstants.CONTENT_NAME, ContentTypeBuilder.PT_CONTENTTYPES).length == 0) |
| return; |
| invalidate(); |
| } |
| |
| /** |
| * Causes a new catalog to be built afresh next time an API call is made. |
| */ |
| synchronized void invalidate() { |
| if (ContentTypeManager.DEBUGGING && catalog != null) |
| ContentMessages.message("Registry discarded"); //$NON-NLS-1$ |
| catalog = null; |
| } |
| |
| /* (non-Javadoc) |
| * @see IContentTypeManager#addContentTypeChangeListener(IContentTypeChangeListener) |
| */ |
| public void addContentTypeChangeListener(IContentTypeChangeListener listener) { |
| contentTypeListeners.add(listener); |
| } |
| |
| /* (non-Javadoc) |
| * @see IContentTypeManager#removeContentTypeChangeListener(IContentTypeChangeListener) |
| */ |
| public void removeContentTypeChangeListener(IContentTypeChangeListener listener) { |
| contentTypeListeners.remove(listener); |
| } |
| |
| public void fireContentTypeChangeEvent(ContentType type) { |
| Object[] listeners = this.contentTypeListeners.getListeners(); |
| IContentType eventObject = new ContentTypeHandler(type, type.getCatalog().getGeneration()); |
| for (int i = 0; i < listeners.length; i++) { |
| final ContentTypeChangeEvent event = new ContentTypeChangeEvent(eventObject); |
| final IContentTypeChangeListener listener = (IContentTypeChangeListener) listeners[i]; |
| ISafeRunnable job = new ISafeRunnable() { |
| public void handleException(Throwable exception) { |
| // already logged in SafeRunner#run() |
| } |
| |
| public void run() throws Exception { |
| listener.contentTypeChanged(event); |
| } |
| }; |
| SafeRunner.run(job); |
| } |
| } |
| |
| public IContentDescription getSpecificDescription(BasicDescription description) { |
| // this is the platform content type manager, no specificities |
| return description; |
| } |
| } |