001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.jxpath.ri.compiler;
018
019import org.apache.commons.jxpath.ri.EvalContext;
020import org.apache.commons.jxpath.ri.axes.InitialContext;
021
022/**
023 * @author Dmitri Plotnikov
024 * @version $Revision: 652845 $ $Date: 2008-05-02 13:46:46 -0400 (Fri, 02 May 2008) $
025 */
026public class LocationPath extends Path {
027
028    private boolean absolute;
029
030    /**
031     * Create a new LocationPath.
032     * @param absolute whether this is an absolute path
033     * @param steps to evaluate
034     */
035    public LocationPath(boolean absolute, Step[] steps) {
036        super(steps);
037        this.absolute = absolute;
038    }
039
040    /**
041     * Learn whether this LocationPath is absolute.
042     * @return boolean
043     */
044    public boolean isAbsolute() {
045        return absolute;
046    }
047
048    public boolean computeContextDependent() {
049        return !absolute || super.computeContextDependent();
050    }
051
052    public String toString() {
053        StringBuffer buffer = new StringBuffer();
054        Step[] steps = getSteps();
055        if (steps != null) {
056            for (int i = 0; i < steps.length; i++) {
057                if (i > 0 || absolute) {
058                    buffer.append('/');
059                }
060                buffer.append(steps[i]);
061            }
062        }
063        return buffer.toString();
064    }
065
066    public Object compute(EvalContext context) {
067        // Create a chain of contexts
068        EvalContext rootContext;
069        if (isAbsolute()) {
070            rootContext = context.getRootContext().getAbsoluteRootContext();
071        }
072        else {
073            rootContext = new InitialContext(context);
074        }
075        return evalSteps(rootContext);
076    }
077
078    public Object computeValue(EvalContext context) {
079        // Create a chain of contexts
080        EvalContext rootContext;
081        if (isAbsolute()) {
082            rootContext = context.getRootContext().getAbsoluteRootContext();
083        }
084        else {
085            rootContext = new InitialContext(context);
086        }
087        return getSingleNodePointerForSteps(rootContext);
088    }
089}