    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    }