/*

  * 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.util;

 import java.util.Map;

 import javax.faces.context.FacesContext;

 import javax.faces.el.VariableResolver;

 import org.seasar.teeda.core.JsfConstants;

 public class VariableResolverUtil {

     private static final String[] DEFAULT_SCOPES = {

             JsfConstants.REQUEST_SCOPE, JsfConstants.SESSION_SCOPE,

             JsfConstants.APPLICATION_SCOPE };

     private VariableResolverUtil() {

     }

     public static Object resolveVariable(FacesContext context, String name) {

         if (context == null) {

             context = FacesContext.getCurrentInstance();

         }

         return context.getApplication().getVariableResolver().resolveVariable(

                 context, name);

     }

     public static Map getDefaultScopeMap(FacesContext context,

             VariableResolver resolver, String key) {

         return getScopeMap(context, resolver, key, DEFAULT_SCOPES);

     }

     private static Map getScopeMap(FacesContext context,

             VariableResolver resolver, String key, String[] scopes) {

         for (int i = 0; i < scopes.length; i++) {

             Map scopeMap = (Map) resolver.resolveVariable(context, scopes[i]);

             if (scopeMap.get(key) != null) {

                 return scopeMap;

             }

         }

         return null;

     }

 }