/*
    * 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.facelets.pool.impl;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import javax.faces.component.UIViewRoot;
  import javax.faces.context.FacesContext;
  import org.apache.myfaces.config.RuntimeConfig;
  import org.apache.myfaces.config.element.ViewPoolMapping;
  import org.apache.myfaces.config.element.ViewPoolParameter;
  import org.apache.myfaces.shared.util.ViewProtectionUtils;
  import org.apache.myfaces.view.facelets.ViewPoolProcessor;
  import org.apache.myfaces.view.facelets.pool.ViewPool;
  import org.apache.myfaces.view.facelets.pool.ViewPoolFactory;
  
  /**
   *
   */
  public class ViewPoolFactoryImpl extends ViewPoolFactory
  {
      private List<String> urlPatterns;
      private List<ViewPool> viewPoolList;
      private ViewPool defaultViewPool;
      
      public ViewPoolFactoryImpl(FacesContext context)
      {
          RuntimeConfig runtimeConfig = RuntimeConfig.getCurrentInstance(context.getExternalContext());
          // If no view pool mappings set, apply to all views.
          if (runtimeConfig.getViewPoolMappings().isEmpty())
          {
              defaultViewPool = new ViewPoolImpl(context, new HashMap<String, String>());
          }
          urlPatterns = new ArrayList<String>();
          viewPoolList = new ArrayList<ViewPool>();
          for (ViewPoolMapping vpm : runtimeConfig.getViewPoolMappings())
          {
              urlPatterns.add(vpm.getUrlPattern());
              Map<String,String> parameters = new HashMap<String, String>();
              for (ViewPoolParameter param : vpm.getParameterList())
              {
                  parameters.put(param.getName(), param.getValue());
              }
              viewPoolList.add(new ViewPoolImpl(context, parameters));
          }
      }
      
      @Override
      public ViewPool getViewPool(FacesContext context, UIViewRoot root)
      {
          for (int i = 0; i < urlPatterns.size(); i++)
          {
              String urlPattern = urlPatterns.get(i);
              if (ViewProtectionUtils.matchPattern(root.getViewId(), urlPattern))
              {
                  return viewPoolList.get(i);
              }
          }
          if (defaultViewPool != null)
          {
              // The default view pool applies to all views that does not have any view pool mapping,
              // but only when oamEnableViewPool is set, so we need a check here when it is not to avoid
              // use view pool on all views when only alwaysRecompile is set to true.
              Boolean enableViewPool = (Boolean) root.getAttributes().get(ViewPoolProcessor.ENABLE_VIEW_POOL);
              if (enableViewPool == null)
              {
                  return null;
              }
              return defaultViewPool;
          }
          return null;
      }
  }