| /******************************************************************************* |
| * Copyright (c) 2006, 2007 Oracle. 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: Oracle. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jpt.ui.internal; |
| |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import org.eclipse.core.runtime.CoreException; |
| 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.jpt.utility.internal.CollectionTools; |
| import org.eclipse.jpt.utility.internal.iterators.CompositeIterator; |
| import org.eclipse.jpt.utility.internal.iterators.TransformationIterator; |
| |
| public class PlatformRegistry |
| { |
| public static final PlatformRegistry INSTANCE = new PlatformRegistry(); |
| |
| private static final String EXTENSION_ID = |
| "jpaPlatform"; //$NON-NLS-1$ |
| |
| private static final String EL_PLATFORM = |
| "jpaPlatform"; //$NON-NLS-1$ |
| |
| private static final String AT_ID = |
| "id"; //$NON-NLS-1$ |
| |
| private static final String AT_CLASS = |
| "class"; //$NON-NLS-1$ |
| |
| // key: String jpaPlatform id value: IConfigurationElement class descriptor |
| private Map<String, IConfigurationElement> jpaPlatforms; |
| |
| |
| /* (non Java doc) |
| * restrict access |
| */ |
| private PlatformRegistry() { |
| buildJpaPlatforms(); |
| } |
| |
| |
| private void buildJpaPlatforms() { |
| this.jpaPlatforms = new HashMap<String, IConfigurationElement>(); |
| |
| for (Iterator stream = allConfigElements(); stream.hasNext(); ) { |
| buildJpaPlatform((IConfigurationElement) stream.next()); |
| } |
| } |
| |
| private void buildJpaPlatform(IConfigurationElement configElement) { |
| if (! configElement.getName().equals(EL_PLATFORM)) { |
| return; |
| } |
| |
| String platformId = configElement.getAttribute(AT_ID); |
| String platformClass = configElement.getAttribute(AT_CLASS); |
| |
| if ((platformId == null) || (platformClass == null)) { |
| if (platformId == null) { |
| reportMissingAttribute(configElement, AT_ID); |
| } |
| if (platformClass == null) { |
| reportMissingAttribute(configElement, AT_CLASS); |
| } |
| return; |
| } |
| |
| if (jpaPlatforms.containsKey(platformId)) { |
| IConfigurationElement otherConfigElement = jpaPlatforms.get(platformId); |
| reportDuplicatePlatform(configElement, otherConfigElement); |
| } |
| |
| jpaPlatforms.put(platformId, configElement); |
| } |
| |
| public IJpaPlatformUi getJpaPlatform(String vendorId) { |
| IConfigurationElement registeredConfigElement = this.jpaPlatforms.get(vendorId); |
| |
| if (registeredConfigElement == null) { |
| return null; |
| } |
| |
| try { |
| return (IJpaPlatformUi) registeredConfigElement.createExecutableExtension(AT_CLASS); |
| } |
| catch (CoreException ce) { |
| reportFailedInstantiation(registeredConfigElement); |
| return null; |
| } |
| } |
| |
| private Iterator allConfigElements() { |
| IExtensionRegistry registry = Platform.getExtensionRegistry(); |
| IExtensionPoint extensionPoint = |
| registry.getExtensionPoint(JptUiPlugin.PLUGIN_ID, EXTENSION_ID); |
| IExtension[] extensions = extensionPoint.getExtensions(); |
| |
| return new CompositeIterator( |
| new TransformationIterator(CollectionTools.iterator(extensions)) { |
| @Override |
| protected Object transform(Object next) { |
| return CollectionTools.iterator(((IExtension) next).getConfigurationElements()); |
| } |
| } |
| ); |
| } |
| |
| // TODO externalize strings |
| private void reportMissingAttribute(IConfigurationElement configElement, String attributeName) { |
| String message = |
| "An extension element \"" |
| + configElement.getName() |
| + "\" in plugin \"" |
| + configElement.getContributor().getName() |
| + "\" is missing a required attribute \"" |
| + attributeName |
| + "\"."; |
| JptUiPlugin.log(message); |
| } |
| |
| // TODO externalize strings |
| private void reportDuplicatePlatform( |
| IConfigurationElement oneConfigElement, IConfigurationElement otherConfigElement) { |
| String message = |
| "The plugins \"" |
| + oneConfigElement.getContributor().getName() |
| + "\" and \"" |
| + otherConfigElement.getContributor().getName() |
| + "\" have registered a duplicate attribute \"id\" " |
| + "for the extension element \"jpaVendor\"."; |
| JptUiPlugin.log(message); |
| } |
| |
| // TODO externalize strings |
| private void reportFailedInstantiation(IConfigurationElement configElement) { |
| String message = |
| "Could not instantiate the class \"" |
| + configElement.getAttribute(AT_CLASS) |
| + "\" for the extension element \"" |
| + configElement.getName() |
| + "\" in the plugin \"" |
| + configElement.getContributor().getName() |
| + "\"."; |
| JptUiPlugin.log(message); |
| } |
| } |