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     */
017    package org.apache.commons.jxpath.ri.compiler;
018    
019    import org.apache.commons.jxpath.ri.EvalContext;
020    import org.apache.commons.jxpath.ri.axes.InitialContext;
021    
022    /**
023     * @author Dmitri Plotnikov
024     * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
025     */
026    public 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    }