Commons JXPath example source code file (LocationPath.java)

This example Commons JXPath source code file (LocationPath.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, initialcontext, initialcontext, locationpath, object, object, path, step, step, string, stringbuffer

The Commons JXPath LocationPath.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.compiler;

import org.apache.commons.jxpath.ri.EvalContext;
import org.apache.commons.jxpath.ri.axes.InitialContext;

/**
 * @author Dmitri Plotnikov
 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
 */
public class LocationPath extends Path {

    private boolean absolute;

    /**
     * Create a new LocationPath.
     * @param absolute whether this is an absolute path
     * @param steps to evaluate
     */
    public LocationPath(boolean absolute, Step[] steps) {
        super(steps);
        this.absolute = absolute;
    }

    /**
     * Learn whether this LocationPath is absolute.
     * @return boolean
     */
    public boolean isAbsolute() {
        return absolute;
    }

    public boolean computeContextDependent() {
        return !absolute || super.computeContextDependent();
    }

    public String toString() {
        StringBuffer buffer = new StringBuffer();
        Step[] steps = getSteps();
        if (steps != null) {
            for (int i = 0; i < steps.length; i++) {
                if (i > 0 || absolute) {
                    buffer.append('/');
                }
                buffer.append(steps[i]);
            }
        }
        return buffer.toString();
    }

    public Object compute(EvalContext context) {
        // Create a chain of contexts
        EvalContext rootContext;
        if (isAbsolute()) {
            rootContext = context.getRootContext().getAbsoluteRootContext();
        }
        else {
            rootContext = new InitialContext(context);
        }
        return evalSteps(rootContext);
    }

    public Object computeValue(EvalContext context) {
        // Create a chain of contexts
        EvalContext rootContext;
        if (isAbsolute()) {
            rootContext = context.getRootContext().getAbsoluteRootContext();
        }
        else {
            rootContext = new InitialContext(context);
        }
        return getSingleNodePointerForSteps(rootContext);
    }
}