Commons JXPath example source code file (NodeSetContext.java)

This example Commons JXPath source code file (NodeSetContext.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, nodeset, nodeset, nodesetcontext, nodesetcontext

The Commons JXPath NodeSetContext.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.NodeSet;
import org.apache.commons.jxpath.ri.EvalContext;
import org.apache.commons.jxpath.ri.model.NodePointer;

/**
 * A simple context that is based on a {@link NodeSet}.
 *
 * @author Dmitri Plotnikov
 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
 */
public class NodeSetContext extends EvalContext {
    private boolean startedSet = false;
    private NodeSet nodeSet;

    /**
     * Create a new NodeSetContext.
     * @param parentContext parent context
     * @param nodeSet associated NodeSet
     */
    public NodeSetContext(EvalContext parentContext, NodeSet nodeSet) {
        super(parentContext);
        this.nodeSet = nodeSet;
    }

    public NodeSet getNodeSet() {
        return nodeSet;
    }

    public NodePointer getCurrentNodePointer() {
        if (position == 0 && !setPosition(1)) {
            return null;
        }
        return (NodePointer) nodeSet.getPointers().get(position - 1);
    }

    public boolean setPosition(int position) {
        super.setPosition(position);
        return position >= 1 && position <= nodeSet.getPointers().size();
    }

    public boolean nextSet() {
        if (startedSet) {
            return false;
        }
        startedSet = true;
        return true;
    }

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