/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * Licensed 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.seasar.teeda.core.scope.impl;

 import java.util.Map;

 import javax.faces.context.ExternalContext;

 import javax.faces.context.FacesContext;

 /**

  * @author shot

  * @author yone

  */

 public class DispatchScopeFactory {

     public static final String DISPATCH_SCOPE_KEY = DispatchScopeFactory.class

             .getName()

             + ".DISPATCH_SCOPE_KEY";

     public static void create() {

         Map requestMap = getRequestMap();

         requestMap.put(DISPATCH_SCOPE_KEY, new DispatchScope());

     }

     public static DispatchScope getDispatchScope() {

         if (!initialized()) {

             create();

         }

         return (DispatchScope) getRequestMap().get(DISPATCH_SCOPE_KEY);

     }

     private static boolean initialized() {

         Map requestMap = getRequestMap();

         if (requestMap == null) {

             return false;

         }

         return requestMap.containsKey(DISPATCH_SCOPE_KEY);

     }

     public static void destroy() {

         Map requestMap = getRequestMap();

         if (requestMap == null) {

             return;

         }

         getRequestMap().remove(DISPATCH_SCOPE_KEY);

         create();

     }

     protected static Map getRequestMap() {

         FacesContext context = FacesContext.getCurrentInstance();

         if (context == null) {

             return null;

         }

         ExternalContext externalContext = context.getExternalContext();

         return externalContext.getRequestMap();

     }

 }