| /******************************************************************************* |
| * Copyright (c) 2001, 2008 Oracle 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: |
| * Oracle Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jst.jsf.core.internal; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| |
| /** |
| * Loads and caches extension for the tagRegistry extension point. |
| * |
| * @author cbateman |
| * |
| */ |
| /* package */class TagLibraryRegistryLoader |
| { |
| private final static String EXTENSION_ID = "tagregistry"; //$NON-NLS-1$ |
| private final static String ELEMENT_NAME = "tagRegistry"; //$NON-NLS-1$ |
| |
| private static Set<TagRegistryFactoryInfo> _extensions; |
| |
| /** |
| * @return the list of handlers. The list is not modifiable and will throw |
| * exceptions if it is attempted. |
| */ |
| public static synchronized Set<TagRegistryFactoryInfo> getAllHandlers() |
| { |
| if (_extensions == null) |
| { |
| _extensions = readAllHandlers(); |
| } |
| return Collections.unmodifiableSet(_extensions); |
| |
| } |
| |
| private static Set<TagRegistryFactoryInfo> readAllHandlers() |
| { |
| Set<TagRegistryFactoryInfo> result = new HashSet<TagRegistryFactoryInfo>(); |
| IExtensionPoint extensionPoint = JSFCorePlugin.getDefault() |
| .getExtension(EXTENSION_ID); |
| IExtension[] extensions = extensionPoint.getExtensions(); |
| |
| for (int i = 0; i < extensions.length; i++) |
| { |
| IExtension ext = extensions[i]; |
| IConfigurationElement[] configElements = ext |
| .getConfigurationElements(); |
| |
| for (int j = 0; j < configElements.length; j++) |
| { |
| final IConfigurationElement element = configElements[j]; |
| if (ELEMENT_NAME.equals(element.getName())) |
| { |
| try |
| { |
| final TagRegistryFactoryInfo extension = new TagRegistryFactoryInfo( |
| element); |
| result.add(extension); |
| } |
| catch (CoreException e) |
| { |
| JSFCorePlugin.log(e, |
| "Error loading tag registry extension: " //$NON-NLS-1$ |
| + element.getContributor().getName() |
| + "." + element.getAttribute("id")); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| } |
| } |
| } |
| return result; |
| } |
| } |