| //------------------------------------------------------------------------------ |
| // Copyright (c) 2005, 2007 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; |
| |
| import java.util.HashMap; |
| import java.util.Iterator; |
| 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.internal.LibraryManagerElement; |
| import org.eclipse.epf.services.Services; |
| import org.osgi.framework.Bundle; |
| |
| /** |
| * Manages the creation of Library Manager instances. |
| * |
| * @author Kelvin Low |
| * @since 1.0 |
| */ |
| public class LibraryManagerFactory { |
| |
| /** |
| * The extension point namespace. |
| */ |
| public static final String EXTENSION_POINT_NAMESPACE = "org.eclipse.epf.library"; //$NON-NLS-1$ |
| |
| /** |
| * The extension point name. |
| */ |
| public static final String EXTENSION_POINT_NAME = "libraryManagers"; //$NON-NLS-1$ |
| |
| /** |
| * The "class" attribute name. |
| */ |
| public static final String CLASS_ATTRIB_NAME = "class"; //$NON-NLS-1$ |
| |
| /** |
| * The "type" attribute name. |
| */ |
| public static final String TYPE_ATTRIB_NAME = "type"; //$NON-NLS-1$ |
| |
| /** |
| * The "typeName" attribute name. |
| */ |
| public static final String TYPE_NAME_ATTRIB_NAME = "typeName"; //$NON-NLS-1$ |
| |
| private static final String VERSION_ATTRIB_NAME = "version"; //$NON-NLS-1$ |
| |
| // The shared instance. |
| private static LibraryManagerFactory instance = null; |
| |
| // A map of library manager configuration elements. |
| private Map<String, LibraryManagerElement> libraryManagerElements = new HashMap<String, LibraryManagerElement>(); |
| |
| /** |
| * Returns the shared instance. |
| */ |
| public static LibraryManagerFactory getInstance() { |
| if (instance == null) { |
| synchronized (LibraryManagerFactory.class) { |
| if (instance == null) { |
| instance = new LibraryManagerFactory(); |
| } |
| } |
| } |
| return instance; |
| } |
| |
| /** |
| * Creates a new instance. |
| */ |
| private LibraryManagerFactory() { |
| init(); |
| } |
| |
| /** |
| * Performs the necessary initialization. |
| */ |
| protected void init() { |
| // Process the "org.eclipse.epf.library.libraryManagers" extension point |
| // contributors. |
| IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry(); |
| IExtensionPoint extensionPoint = extensionRegistry.getExtensionPoint( |
| EXTENSION_POINT_NAMESPACE, EXTENSION_POINT_NAME); |
| 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_ATTRIB_NAME); |
| String typeId = configElement |
| .getAttribute(TYPE_ATTRIB_NAME); |
| String typeName = configElement |
| .getAttribute(TYPE_NAME_ATTRIB_NAME); |
| if (className != null && className.trim().length() > 0 |
| && typeId != null && typeId.trim().length() > 0 |
| && typeName != null |
| && typeName.trim().length() > 0) { |
| int version = Services.parseVersion(configElement.getAttribute(VERSION_ATTRIB_NAME)); |
| LibraryManagerElement provider = libraryManagerElements.get(typeId); |
| if(provider == null || provider.getVersion() < version) { |
| provider = new LibraryManagerElement( |
| bundle, className, typeId, typeName, version); |
| libraryManagerElements.put(typeId, provider); |
| } |
| } |
| } catch (Exception e) { |
| LibraryPlugin.getDefault().getLogger().logError(e); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Creates a new library manager instance. |
| * |
| * @param type |
| * the method library type |
| * @return a library manager |
| * @throw <code>CreateLibraryManagerException</code> if an error occurs |
| * while performing the operation |
| */ |
| public ILibraryManager createLibraryManager(String type) |
| throws CreateLibraryManagerException { |
| LibraryManagerElement provider = (LibraryManagerElement) libraryManagerElements |
| .get(type); |
| if (provider == null) { |
| throw new CreateLibraryManagerException(); |
| } |
| try { |
| Class clazz = provider.getBundle().loadClass( |
| provider.getClassName()); |
| return (ILibraryManager) clazz.newInstance(); |
| } catch (Exception e) { |
| LibraryPlugin.getDefault().getLogger().logError(e); |
| throw new CreateLibraryManagerException(e); |
| } |
| } |
| |
| /** |
| * Returns all the library types registered via the |
| * "org.eclipse.epf.library.libraryManagers" extension point. |
| * |
| * @return a map of library types |
| */ |
| public Map getLibraryTypes() { |
| Map<String, String> types = new HashMap<String, String>(); |
| for (Iterator it = libraryManagerElements.keySet().iterator(); it |
| .hasNext();) { |
| String typeId = (String) it.next(); |
| String typeName = ((LibraryManagerElement) libraryManagerElements |
| .get(typeId)).getTypeName(); |
| types.put(typeId, typeName); |
| } |
| return types; |
| } |
| |
| } |