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JMeter example source code file (HashTreeTraverser.java)

This example JMeter source code file (HashTreeTraverser.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - JMeter tags/keywords

hashtree, hashtree, hashtreetraverser, hashtreetraverser

The JMeter HashTreeTraverser.java source code

/*
 * 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.jorphan.collections;

/**
 * By implementing this interface, a class can easily traverse a HashTree
 * object, and be notified via callbacks of certain events. There are three such
 * events:
 * <ol>
 * <li>When a node is first encountered, the traverser's
 * {@link #addNode(Object,HashTree)} method is called. It is handed the object
 * at that node, and the entire sub-tree of the node.</li>
 * <li>When a leaf node is encountered, the traverser is notified that a full
 * path has been finished via the {@link #processPath()} method. It is the
 * traversing class's responsibility to know the path that has just finished
 * (this can be done by keeping a simple stack of all added nodes).</li>
 * <li>When a node is retraced, the traverser's {@link #subtractNode()} is
 * called. Again, it is the traverser's responsibility to know which node has
 * been retraced.</li>
 * </ol>
 * To summarize, as the traversal goes down a tree path, nodes are added. When
 * the end of the path is reached, the {@link #processPath()} call is sent. As
 * the traversal backs up, nodes are subtracted.
 * <p>
 * The traversal is a depth-first traversal.
 *
 * @see HashTree
 * @see SearchByClass
 *
 * @version $Revision: 674365 $
 */
public interface HashTreeTraverser {
    /**
     * The tree traverses itself depth-first, calling addNode for each object it
     * encounters as it goes. This is a callback method, and should not be
     * called except by a HashTree during traversal.
     *
     * @param node
     *            the node currently encountered
     * @param subTree
     *            the HashTree under the node encountered
     */
    public void addNode(Object node, HashTree subTree);

    /**
     * Indicates traversal has moved up a step, and the visitor should remove
     * the top node from its stack structure. This is a callback method, and
     * should not be called except by a HashTree during traversal.
     */
    public void subtractNode();

    /**
     * Process path is called when a leaf is reached. If a visitor wishes to
     * generate Lists of path elements to each leaf, it should keep a Stack data
     * structure of nodes passed to it with addNode, and removing top items for
     * every {@link #subtractNode()} call. This is a callback method, and should
     * not be called except by a HashTree during traversal.
     */
    public void processPath();
}

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