| /******************************************************************************* |
| * Copyright (c) 2000, 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 API and implementation |
| *******************************************************************************/ |
| package org.eclipse.update.internal.core; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.osgi.util.NLS; |
| import org.eclipse.update.core.*; |
| |
| /** |
| * Manages FeatureFactory extension point |
| */ |
| public final class FeatureTypeFactory { |
| |
| private static FeatureTypeFactory inst; |
| private Map factories; |
| |
| private static final String SIMPLE_EXTENSION_ID = "featureTypes"; //$NON-NLS-1$ |
| |
| /* |
| * hide constructor |
| */ |
| private FeatureTypeFactory() { |
| } |
| |
| /* |
| * Singleton pattern |
| */ |
| public static FeatureTypeFactory getInstance() { |
| if (inst == null) |
| inst = new FeatureTypeFactory(); |
| return inst; |
| } |
| |
| /* |
| * return the factory for the associated type |
| */ |
| public IFeatureFactory getFactory(String type) throws CoreException { |
| // |
| Object instance = getFactories().get(type); |
| if (instance == null) { |
| instance = createFactoryFor(type); |
| getFactories().put(type, instance); |
| } |
| return (IFeatureFactory) instance; |
| } |
| |
| /* |
| * creates a factory for the associated type and cache it |
| */ |
| private IFeatureFactory createFactoryFor(String type) throws CoreException { |
| IFeatureFactory result = null; |
| |
| String pluginID = |
| UpdateCore.getPlugin().getBundle().getSymbolicName(); |
| IExtensionRegistry registry = Platform.getExtensionRegistry(); |
| IConfigurationElement[] elements = |
| registry.getConfigurationElementsFor(pluginID, SIMPLE_EXTENSION_ID, type); |
| |
| if (elements == null || elements.length == 0) { |
| throw Utilities.newCoreException( |
| NLS.bind(Messages.FeatureTypeFactory_UnableToFindFeatureFactory, (new String[] { type })), |
| null); |
| } |
| |
| IConfigurationElement element = elements[0]; |
| result = (IFeatureFactory) element.createExecutableExtension("class"); //$NON-NLS-1$ |
| return result; |
| } |
| |
| /* |
| * |
| */ |
| private Map getFactories() { |
| if (factories == null) |
| factories = new HashMap(); |
| return factories; |
| } |
| } |