/*
    * 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.spi.impl;
  
  import javax.faces.context.ExternalContext;
  import org.apache.myfaces.shared.util.ClassUtils;
  import org.apache.myfaces.spi.ViewScopeProvider;
  import org.apache.myfaces.spi.ViewScopeProviderFactory;
  import org.apache.myfaces.util.ExternalSpecifications;
  import org.apache.myfaces.view.impl.DefaultViewScopeHandler;
  
  /**
   *
   * @author Leonardo Uribe
   */
  public class DefaultViewScopeProviderFactory extends ViewScopeProviderFactory
  {
      
      public static final String VIEW_SCOPE_HANDLER = ViewScopeProvider.class.getName();
      public static final String VIEW_SCOPE_HANDLER_INSTANCE_KEY = VIEW_SCOPE_HANDLER + ".INSTANCE";
  
      @Override
      public ViewScopeProvider getViewScopeHandler(ExternalContext externalContext)
      {
          // check for cached instance
          ViewScopeProvider returnValue = (ViewScopeProvider)
                  externalContext.getApplicationMap().get(VIEW_SCOPE_HANDLER_INSTANCE_KEY);
  
          if (returnValue == null)
          {
              if (ExternalSpecifications.isCDIAvailable(externalContext))
              {
                  returnValue = (ViewScopeProvider) ClassUtils.newInstance(
                      "org.apache.myfaces.cdi.impl.CDIManagedBeanHandlerImpl");
                      //CDIManagedBeanHandler.getInstance(externalContext);
              }
              else
              {
                  returnValue = new DefaultViewScopeHandler();
              }
              // cache the result on the ApplicationMap
              externalContext.getApplicationMap().put(VIEW_SCOPE_HANDLER_INSTANCE_KEY, returnValue);
          }
  
          return returnValue;
      }
  
      @Override
      public void setViewScopeHandler(ExternalContext externalContext, ViewScopeProvider viewScopeHandler)
      {
          externalContext.getApplicationMap().put(VIEW_SCOPE_HANDLER_INSTANCE_KEY, viewScopeHandler);
      }
  }