RELEASE_2_1_13/src/blocks/forms/java/org/apache/cocoon/forms/formmodel/ContainerWidget.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.cocoon.forms.formmodel;

import java.util.Iterator;

/**
 * Interface to be implemented by Widgets which contain other widgets. So all
 * widgets together form a widget tree, with its root being the {@link Form}
 * widget, the {@link ContainerWidget}s being the branches/forks, and the
 * {@link Widget}s with values being the leaves.
 *
 * @version $Id$
 */
public interface ContainerWidget extends Widget {
    
    /**
     * Adds a child widget.
     */
    public void addChild(Widget widget);
    //TODO: check to remove since we have no removeChild
    

    /**
     * Checks if there is a child widget with the given id.
     */
    public boolean hasChild(String id);

    /**
     * Gets the child widget with the given id.
     * @return null if there is no child with the given id.
     */
    public Widget getChild(String id);

    /**
     * @return an iterator over the widgets this object contains
     */
    public Iterator getChildren();

}