/*

  * 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.ArrayList;

 import java.util.Iterator;

 import java.util.List;

 import javax.faces.component.NamingContainer;

 import javax.faces.component.UIComponent;

 import javax.faces.context.FacesContext;

 /**

  * @author shot

  */

 public class StateManagerUtil {

     private StateManagerUtil() {

     }

     public static boolean isSavingStateInClient(FacesContext context) {

         return FacesContextUtil.getStateManager(context).isSavingStateInClient(

                 context);

     }

     public static void assertComponentNoDuplicateId(UIComponent component) {

         assertComponentNoDuplicateIdInternal(component, new ArrayList());

     }

     private static void assertComponentNoDuplicateIdInternal(

             UIComponent component, List idList) {

         String id = component.getId();

         if (id != null && idList.contains(id)) {

             throw new IllegalStateException("Component id:" + id

                     + " has same id in view tree.");

         }

         idList.add(id);

         for (Iterator itr = component.getFacetsAndChildren(); itr.hasNext();) {

             UIComponent child = (UIComponent) itr.next();

             if (component instanceof NamingContainer) {

                 assertComponentNoDuplicateId(child);

             } else {

                 assertComponentNoDuplicateIdInternal(child, idList);

             }

         }

     }

 }