/*
 * 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;

/**
 * An action that acts on a repeater.
 *
 * @see RepeaterActionDefinitionBuilder
 * @version $Id$
 */
public class RepeaterAction extends Action {

    private Repeater repeater;


    public RepeaterAction(RepeaterActionDefinition definition) {
        super(definition);
    }

    /**
     * Get the repeater on which this action acts.
     */
    public Repeater getRepeater() {
        if (this.repeater == null) {
            String name = ((RepeaterActionDefinition) getDefinition()).getRepeaterName();
            Widget widget;
            if (name != null) {
                // Get the corresponding sibling
                widget = ((ContainerWidget) getParent()).getChild(name);
            } else {
                // Get the grand-parent (parent is the repeater row).
                widget = getParent().getParent();
            }

            if (widget == null || !(widget instanceof Repeater)) {
                throw new RuntimeException(name != null ?
                    "Cannot find sibling repeater named '" + name + "'." :
                    "Parent widget is not a repeater");
            }

            this.repeater = (Repeater)widget;
        }

        return this.repeater;
    }
}