| /******************************************************************************* |
| * Copyright (c) 2008 Oracle Corporation. |
| * 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: |
| * Cameron Bateman - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jst.jsf.designtime.internal.view.mapping.viewmapping; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| 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.jst.jsf.core.internal.JSFCorePlugin; |
| import org.eclipse.jst.jsf.designtime.internal.view.mapping.ICustomViewMapper; |
| |
| /** |
| * @author cbateman |
| * |
| */ |
| public class CustomViewMapperExtensionLoader |
| { |
| private final static String EXTENSION_ID = "customViewMapper"; |
| private final static String ELEMENT_NAME = "customViewMapper"; |
| |
| private static Map<String, ICustomViewMapper> _extensions; |
| |
| /** |
| * @param id |
| * @return the list of handlers. The list is not modifiable and will throw |
| * exceptions if it is attempted. |
| */ |
| public static synchronized ICustomViewMapper getCustomViewMapper( |
| final String id) |
| { |
| if (_extensions == null) |
| { |
| _extensions = Collections.unmodifiableMap(readAllHandlers()); |
| } |
| return _extensions.get(id); |
| } |
| |
| private static Map<String, ICustomViewMapper> readAllHandlers() |
| { |
| final Map<String, ICustomViewMapper> handlers = new HashMap<String, ICustomViewMapper>(); |
| final IExtensionPoint extensionPoint = JSFCorePlugin.getDefault() |
| .getExtension(EXTENSION_ID); |
| final IExtension[] extensions = extensionPoint.getExtensions(); |
| |
| for (final IExtension ext : extensions) |
| { |
| final IConfigurationElement[] configElements = ext |
| .getConfigurationElements(); |
| |
| for (final IConfigurationElement element : configElements) |
| { |
| if (ELEMENT_NAME.equals(element.getName())) |
| { |
| try |
| { |
| final String pluginId = element.getContributor() |
| .getName(); |
| final String name = element.getAttribute("id"); |
| final Object customHandler = element |
| .createExecutableExtension("class"); |
| if (customHandler instanceof ICustomViewMapper |
| && name != null) |
| { |
| handlers.put(pluginId + "." + name, |
| (ICustomViewMapper) customHandler); |
| } |
| else |
| { |
| JSFCorePlugin.log( |
| "Error loading tag registry extension: " |
| + element.getContributor().getName() |
| + "." + element.getAttribute("id") |
| , new Throwable("No exception: stack trace only")); |
| } |
| } |
| catch (final CoreException e) |
| { |
| JSFCorePlugin.log(e, |
| "Error loading tag registry extension: " |
| + element.getContributor().getName() |
| + "." + element.getAttribute("id")); |
| } |
| } |
| } |
| } |
| return handlers; |
| } |
| } |