/*

  * 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 javax.faces.internal;

 import java.io.Serializable;

 import java.util.AbstractList;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Iterator;

 import java.util.List;

 import javax.faces.component.UIComponent;

 import org.seasar.framework.util.AssertionUtil;

 /**

  * @author shot

  * 

  * This class might be changed without notice. Please do not use it

  * excluding the JSF specification part.

  */

 public class ComponentChildrenListWrapper extends AbstractList implements

         Serializable {

     private static final long serialVersionUID = 3617294519188666163L;

     private final List list = new ArrayList();

     private final UIComponent parent;

     public ComponentChildrenListWrapper(final UIComponent parent) {

         this.parent = parent;

     }

     public Object get(final int index) {

         return list.get(index);

     }

     public Object remove(final int index) {

         final UIComponent child = (UIComponent) list.remove(index);

         if (child != null) {

             child.setParent(null);

         }

         return child;

     }

     public int size() {

         return list.size();

     }

     public void add(final int index, final Object child) {

         assertUIComponent(child);

         setNewParent((UIComponent) child);

         list.add(index, child);

     }

     public boolean add(final Object child) {

         assertUIComponent(child);

         setNewParent((UIComponent) child);

         return list.add(child);

     }

     public boolean addAll(final Collection children) {

         boolean changed = false;

         for (final Iterator it = children.iterator(); it.hasNext();) {

             final Object child = it.next();

             assertUIComponent(child);

             add(child);

             changed = true;

         }

         return changed;

     }

     public Iterator iterator() {

         return list.iterator();

     }

     private void setNewParent(final UIComponent child) {

         child.setParent(parent);

     }

     private void assertUIComponent(final Object obj) {

         AssertionUtil.assertNotNull("value", obj);

         if (!(obj instanceof UIComponent)) {

             throw new ClassCastException(obj.getClass().getName());

         }

     }

 }