/*

  * Copyright 2004-2008 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.uruma.component.base;

 import java.util.ArrayList;

 import java.util.List;

 import org.seasar.uruma.component.UIElement;

 import org.seasar.uruma.component.UIElementContainer;

 import org.seasar.uruma.component.UIElementVisitor;

 import org.seasar.uruma.util.AssertionUtil;

 /**

  * {@link UIElementContainer} のための基底クラスです。<br />

  * 

  * @author y-komori

  */

 public class AbstractUIElementContainer extends AbstractUIElement implements

         UIElementContainer {

     private List<UIElement> children = new ArrayList<UIElement>();

     /*

      * @see org.seasar.uruma.component.UIElementContainer#addChild(org.seasar.uruma.component.UIElement)

      */

     public void addChild(final UIElement child) {

         AssertionUtil.assertNotNull("child", child);

         this.children.add(child);

     }

     /*

      * @see org.seasar.uruma.component.UIElementContainer#getChildren()

      */

     public List<UIElement> getChildren() {

         return children;

     }

     /*

      * @see org.seasar.uruma.component.base.AbstractUIElement#accept(org.seasar.uruma.component.UIElementVisitor)

      */

     @Override

     public void accept(final UIElementVisitor visitor) {

         visitor.visit(this);

     }

 }