/*

  * 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.lifecycle;

 import java.util.HashMap;

 import java.util.Map;

 import javax.faces.context.FacesContext;

 import javax.faces.lifecycle.ClientWindow;

 import javax.faces.render.ResponseStateManager;

 /**

  *

  * @author lu4242

  */

 public class UrlClientWindow extends ClientWindow

 {

     private String windowId;

     private TokenGenerator tokenGenerator;

     private Map<String,String> queryParamsMap;

     public UrlClientWindow(TokenGenerator tokenGenerator)

     {

         this.tokenGenerator = tokenGenerator;

     }

     @Override

     public void decode(FacesContext context)

     {

         String windowId = calculateWindowId(context);

         if (windowId != null)

         {

             // Store the current windowId.

             setId(windowId);

         }

         else

         {

             //Generate a new windowId

             setId(tokenGenerator._getNextToken());

         }

     }

     protected String calculateWindowId(FacesContext context)

     {

         //1. If it comes as parameter, it takes precedence over any other choice, because

         //   no browser is capable to do a POST and create a new window at the same time.

         String windowId = context.getExternalContext().getRequestParameterMap().get(

                 ResponseStateManager.CLIENT_WINDOW_PARAM);

         if (windowId != null)

         {

             return windowId;

         }

         windowId = context.getExternalContext().getRequestParameterMap().get(

                 ResponseStateManager.CLIENT_WINDOW_URL_PARAM);

         if (windowId != null)

         {

             return windowId;

         }

         return null;

     }

     @Override

     public String getId()

     {

         return windowId;

     }

     public void setId(String id)

     {

         windowId = id;

         queryParamsMap = null;

     }

     @Override

     public Map<String, String> getQueryURLParameters(FacesContext context)

     {

         if (queryParamsMap == null)

         {

             String id = context.getExternalContext().getClientWindow().getId();

             if (id != null)

             {

                 queryParamsMap = new HashMap<String, String>(2,1);

                 queryParamsMap.put(ResponseStateManager.CLIENT_WINDOW_URL_PARAM, id);

             }

         }

         return queryParamsMap;

     }

 }