| //------------------------------------------------------------------------------ |
| // Copyright (c) 2005, 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 implementation |
| //------------------------------------------------------------------------------ |
| package org.eclipse.epf.library.edit.util; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.epf.library.edit.LibraryEditPlugin; |
| import org.eclipse.epf.library.edit.command.INestedCommandProvider; |
| import org.eclipse.epf.library.edit.command.IUserInteractionHandler; |
| import org.osgi.framework.Bundle; |
| |
| /** |
| * Helper class with methods to retrieve extensions |
| * |
| * @author Phong Nguyen Le - Jun 27, 2006 |
| * @since 1.0 |
| */ |
| public final class ExtensionManager { |
| private static Map IDToExtensionMap = new HashMap(); |
| private static List<INestedCommandProvider> nestedCommandProviders; |
| private static List oppositeFeatureLoaders; |
| |
| public static List getExtensions(String namespace, String extensionPointName, Class type) { |
| List list = new ArrayList(); |
| try { |
| IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry(); |
| IExtensionPoint extensionPoint = extensionRegistry.getExtensionPoint(namespace, extensionPointName); |
| if (extensionPoint != null) { |
| IExtension[] extensions = extensionPoint.getExtensions(); |
| for (int i = 0; i < extensions.length; i++) { |
| IExtension extension = extensions[i]; |
| String pluginId = extension.getNamespaceIdentifier(); |
| Bundle bundle = Platform.getBundle(pluginId); |
| IConfigurationElement[] configElements = extension |
| .getConfigurationElements(); |
| for (int j = 0; j < configElements.length; j++) { |
| IConfigurationElement configElement = configElements[j]; |
| try { |
| String className = configElement.getAttribute("class"); //$NON-NLS-1$ |
| if(className != null) { |
| Object ext = bundle.loadClass(className).newInstance(); |
| if(type.isInstance(ext)) { |
| list.add(ext); |
| } |
| } |
| } catch (Exception e) { |
| LibraryEditPlugin.INSTANCE.log(e); |
| } |
| } |
| } |
| } |
| } |
| catch(Exception e) { |
| LibraryEditPlugin.getDefault().getLogger().logError(e); |
| } |
| if(list.isEmpty()) { |
| return Collections.EMPTY_LIST; |
| } |
| return list; |
| } |
| |
| public static Object createExtension(String namespace, String extensionPointName) { |
| // Process the contributors. |
| // |
| IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry(); |
| IExtensionPoint extensionPoint = extensionRegistry.getExtensionPoint(namespace, extensionPointName); |
| if (extensionPoint != null) { |
| IExtension[] extensions = extensionPoint.getExtensions(); |
| Object ext = null; |
| ext_walk: |
| for (int i = 0; i < extensions.length; i++) { |
| IExtension extension = extensions[i]; |
| String pluginId = extension.getNamespaceIdentifier(); |
| Bundle bundle = Platform.getBundle(pluginId); |
| IConfigurationElement[] configElements = extension |
| .getConfigurationElements(); |
| for (int j = 0; j < configElements.length; j++) { |
| IConfigurationElement configElement = configElements[j]; |
| try { |
| String className = configElement.getAttribute("class"); //$NON-NLS-1$ |
| if(className != null) { |
| ext = bundle.loadClass(className).newInstance(); |
| break ext_walk; |
| } |
| } catch (Exception e) { |
| LibraryEditPlugin.INSTANCE.log(e); |
| } |
| } |
| } |
| return ext; |
| } |
| return null; |
| } |
| |
| public static Object getExtension(String namespace, String extensionPointName) { |
| String ID = namespace + '.' + extensionPointName; |
| Object ext = IDToExtensionMap.get(ID); |
| if(ext == null) { |
| synchronized (IDToExtensionMap) { |
| ext = IDToExtensionMap.get(ID); |
| if(ext == null) { |
| ext = createExtension(namespace, extensionPointName); |
| if(ext != null) { |
| IDToExtensionMap.put(ID, ext); |
| } |
| } |
| } |
| |
| } |
| return ext; |
| } |
| |
| public static ITextReferenceReplacer getTextReferenceReplacer() { |
| return (ITextReferenceReplacer) getExtension(LibraryEditPlugin.getDefault().getId(), "textReferenceReplacer"); //$NON-NLS-1$ |
| } |
| |
| public static List<INestedCommandProvider> getNestedCommandProviders() { |
| if(nestedCommandProviders == null) { |
| nestedCommandProviders = getExtensions(LibraryEditPlugin.getDefault().getId(), |
| "nestedCommandProviders", INestedCommandProvider.class); //$NON-NLS-1$ |
| } |
| return nestedCommandProviders; |
| } |
| |
| public static IDiagramManager getDiagramManager() { |
| return (IDiagramManager) getExtension(LibraryEditPlugin.getDefault().getId(), "diagramManager"); //$NON-NLS-1$ |
| } |
| |
| public static List getOppositeFeatureLoaders() { |
| if(oppositeFeatureLoaders == null) { |
| oppositeFeatureLoaders = getExtensions(LibraryEditPlugin.getDefault().getId(), |
| "oppositeFeatureLoaders", INestedCommandProvider.class); //$NON-NLS-1$ |
| } |
| return oppositeFeatureLoaders; |
| } |
| |
| public static IUserInteractionHandler getDefaultUserInteractionHandler() { |
| return (IUserInteractionHandler) getExtension(LibraryEditPlugin.getDefault().getId(), "userInteractionHandler"); //$NON-NLS-1$ |
| } |
| } |