/*
 * 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.jmeter.testelement;

import org.apache.jmeter.testelement.property.JMeterProperty;

/**
 * For traversing Test Elements, which contain property that can be other test
 * elements, strings, collections, maps, objects
 * 
 * @version $Revision: 493779 $ on $Date: 2007-01-07 17:46:38 +0000 (Sun, 07 Jan 2007) $
 */
public interface TestElementTraverser {

	/**
	 * Notification that a new test element is about to be traversed.
	 * 
	 * @param el
	 */
	public void startTestElement(TestElement el);

	/**
	 * Notification that the test element is now done.
	 * 
	 * @param el
	 */
	public void endTestElement(TestElement el);

	/**
	 * Notification that a property is starting. This could be a test element
	 * property or a Map property - depends on the context.
	 * 
	 * @param key
	 */
	public void startProperty(JMeterProperty key);

	/**
	 * Notification that a property is ending. Again, this could be a test
	 * element or a Map property, dependig on the context.
	 * 
	 * @param key
	 */
	public void endProperty(JMeterProperty key);

}
