| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.myfaces.view; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| import javax.faces.context.FacesContext; |
| import javax.faces.view.ViewDeclarationLanguage; |
| import javax.faces.view.ViewDeclarationLanguageFactory; |
| |
| import org.apache.myfaces.config.MyfacesConfig; |
| import org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguageStrategy; |
| import org.apache.myfaces.view.jsp.JspViewDeclarationLanguageStrategy; |
| |
| /** |
| * This is the default VDL factory used as of JSF 2.0, it tries to use Facelet VDL whenever possible, |
| * but fallback on JSP if required. |
| * |
| * @author Simon Lessard (latest modification by $Author$) |
| * @version $Revision$ $Date$ |
| * |
| * @since 2.0 |
| */ |
| public class ViewDeclarationLanguageFactoryImpl extends ViewDeclarationLanguageFactory |
| { |
| private static final String FACELETS_1_VIEW_HANDLER = "com.sun.facelets.FaceletViewHandler"; |
| |
| private static final Logger LOGGER = Logger.getLogger(ViewDeclarationLanguageFactoryImpl.class.getName()); |
| |
| private volatile boolean _initialized; |
| private volatile ViewDeclarationLanguageStrategy[] _supportedLanguages; |
| |
| private volatile List<ViewDeclarationLanguage> _supportedVDLs = null; |
| |
| public ViewDeclarationLanguageFactoryImpl() |
| { |
| _initialized = false; |
| } |
| |
| @Override |
| public ViewDeclarationLanguage getViewDeclarationLanguage(String viewId) |
| { |
| if (!_initialized) |
| { |
| initialize(); |
| } |
| |
| for (ViewDeclarationLanguageStrategy strategy : _supportedLanguages) |
| { |
| if (strategy.handles(viewId)) |
| { |
| return strategy.getViewDeclarationLanguage(); |
| } |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public List<ViewDeclarationLanguage> getAllViewDeclarationLanguages() |
| { |
| if (!_initialized) |
| { |
| initialize(); |
| } |
| |
| if (_supportedVDLs == null) |
| { |
| List<ViewDeclarationLanguage> list = new ArrayList<>(_supportedLanguages.length); |
| for (ViewDeclarationLanguageStrategy strategy : _supportedLanguages) |
| { |
| list.add(strategy.getViewDeclarationLanguage()); |
| } |
| _supportedVDLs = Collections.unmodifiableList(list); |
| } |
| return _supportedVDLs; |
| } |
| |
| /** |
| * Initialize the supported view declaration languages. |
| */ |
| private synchronized void initialize() |
| { |
| if (!_initialized) |
| { |
| FacesContext context = FacesContext.getCurrentInstance(); |
| |
| logWarningIfLegacyFaceletViewHandlerIsPresent(context); |
| |
| if (MyfacesConfig.getCurrentInstance(context).isSupportJSP()) |
| { |
| _supportedLanguages = new ViewDeclarationLanguageStrategy[2]; |
| _supportedLanguages[0] = new FaceletViewDeclarationLanguageStrategy(); |
| _supportedLanguages[1] = new JspViewDeclarationLanguageStrategy(); |
| } |
| else |
| { |
| _supportedLanguages = new ViewDeclarationLanguageStrategy[1]; |
| _supportedLanguages[0] = new FaceletViewDeclarationLanguageStrategy(); |
| } |
| |
| _initialized = true; |
| } |
| } |
| |
| /** |
| * If the Facelets-1 ViewHandler com.sun.facelets.FaceletViewHandler is present, log a error. |
| * |
| * @param context the <code>FacesContext</code> |
| */ |
| private void logWarningIfLegacyFaceletViewHandlerIsPresent(FacesContext context) |
| { |
| boolean facelets1ViewHandlerPresent |
| = context.getApplication().getViewHandler().getClass().getName().equals(FACELETS_1_VIEW_HANDLER); |
| |
| if (facelets1ViewHandlerPresent) |
| { |
| if (LOGGER.isLoggable(Level.WARNING)) |
| { |
| LOGGER.log(Level.WARNING, "Your faces-config.xml contains the " + FACELETS_1_VIEW_HANDLER + " class." |
| + "\nYou need to remove it since it's not supported anymore since JSF 2.0"); |
| } |
| } |
| } |
| } |