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Commons JXPath example source code file (SelfContext.java)

This example Commons JXPath source code file (SelfContext.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 - Commons JXPath tags/keywords

evalcontext, evalcontext, nodepointer, nodepointer, nodetest, nodetest, pointer, selfcontext, selfcontext

The Commons JXPath SelfContext.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.commons.jxpath.ri.axes;

import org.apache.commons.jxpath.Pointer;
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 returns the current node from the parent context if the
 * test succeeds.
 *
 * @author Dmitri Plotnikov
 * @version $Revision: 670727 $ $Date: 2008-06-23 15:10:38 -0500 (Mon, 23 Jun 2008) $
 */
public class SelfContext extends EvalContext {
    private NodeTest nodeTest;
    private boolean startedSet = false;
    private NodePointer nodePointer;

    /**
     * Create a new SelfContext.
     * @param parentContext EvalContext
     * @param nodeTest guard
     */
    public SelfContext(EvalContext parentContext, NodeTest nodeTest) {
        super(parentContext);
        this.nodeTest = nodeTest;
    }

    public Pointer getSingleNodePointer() {
        return parentContext.getSingleNodePointer();
    }

    public NodePointer getCurrentNodePointer() {
        if (position == 0 && !setPosition(1)) {
            return null;
        }
        return nodePointer;
    }

    public boolean nextNode() {
        return setPosition(getCurrentPosition() + 1);
    }

    public void reset() {
        super.reset();
        startedSet = false;
    }

    public boolean setPosition(int position) {
        if (position != 1) {
            return false;
        }
        super.setPosition(position);
        if (!startedSet) {
            startedSet = true;
            nodePointer = (NodePointer) parentContext.getCurrentNodePointer();
        }

        if (nodePointer == null) {
            return false;
        }

        return nodeTest == null || nodePointer.testNode(nodeTest);
    }
}

Other Commons JXPath examples (source code examples)

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

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