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Commons JXPath example source code file (

This example Commons JXPath source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons JXPath tags/keywords

ancestorcontext, ancestorcontext, evalcontext, evalcontext, nodepointer, nodepointer, nodetest, nodetest

The Commons JXPath 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.jxpath.ri.axes;

import org.apache.commons.jxpath.ri.EvalContext;
import org.apache.commons.jxpath.ri.compiler.NodeTest;
import org.apache.commons.jxpath.ri.model.NodePointer;

 * EvalContext that walks the "ancestor::" and "ancestor-or-self::" axes.
 * @author Dmitri Plotnikov
 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
public class AncestorContext extends EvalContext {
    private NodeTest nodeTest;
    private boolean setStarted = false;
    private NodePointer currentNodePointer;
    private boolean includeSelf;

     * Create a new AncestorContext.
     * @param parentContext represents the previous step on the path
     * @param  includeSelf differentiates between "ancestor::" and
     *                     "ancestor-or-self::" axes
     * @param nodeTest is the name of the element(s) we are looking for
    public AncestorContext(
        EvalContext parentContext,
        boolean includeSelf,
        NodeTest nodeTest) {
        this.includeSelf = includeSelf;
        this.nodeTest = nodeTest;

    public NodePointer getCurrentNodePointer() {
        return currentNodePointer;

    public int getDocumentOrder() {
        return -1;

    public void reset() {
        setStarted = false;

    public boolean setPosition(int position) {
        if (position < getCurrentPosition()) {

        while (getCurrentPosition() < position) {
            if (!nextNode()) {
                return false;
        return true;

    public boolean nextNode() {
        if (!setStarted) {
            setStarted = true;
            currentNodePointer = parentContext.getCurrentNodePointer();
            if (includeSelf && currentNodePointer.testNode(nodeTest)) {
                return true;

        while (true) {
            currentNodePointer = currentNodePointer.getImmediateParentPointer();

            if (currentNodePointer == null) {
                return false;

            if (currentNodePointer.testNode(nodeTest)) {
                return true;

Other Commons JXPath examples (source code examples)

Here is a short list of links related to this Commons JXPath source code file:

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