1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.jxpath.ri.compiler;
18
19 import org.apache.commons.jxpath.ri.EvalContext;
20 import org.apache.commons.jxpath.ri.axes.InitialContext;
21
22 /**
23 * @author Dmitri Plotnikov
24 * @version $Revision: 652845 $ $Date: 2008-05-02 19:46:46 +0200 (Fr, 02 Mai 2008) $
25 */
26 public class LocationPath extends Path {
27
28 private boolean absolute;
29
30 /**
31 * Create a new LocationPath.
32 * @param absolute whether this is an absolute path
33 * @param steps to evaluate
34 */
35 public LocationPath(boolean absolute, Step[] steps) {
36 super(steps);
37 this.absolute = absolute;
38 }
39
40 /**
41 * Learn whether this LocationPath is absolute.
42 * @return boolean
43 */
44 public boolean isAbsolute() {
45 return absolute;
46 }
47
48 public boolean computeContextDependent() {
49 return !absolute || super.computeContextDependent();
50 }
51
52 public String toString() {
53 StringBuffer buffer = new StringBuffer();
54 Step[] steps = getSteps();
55 if (steps != null) {
56 for (int i = 0; i < steps.length; i++) {
57 if (i > 0 || absolute) {
58 buffer.append('/');
59 }
60 buffer.append(steps[i]);
61 }
62 }
63 return buffer.toString();
64 }
65
66 public Object compute(EvalContext context) {
67 // Create a chain of contexts
68 EvalContext rootContext;
69 if (isAbsolute()) {
70 rootContext = context.getRootContext().getAbsoluteRootContext();
71 }
72 else {
73 rootContext = new InitialContext(context);
74 }
75 return evalSteps(rootContext);
76 }
77
78 public Object computeValue(EvalContext context) {
79 // Create a chain of contexts
80 EvalContext rootContext;
81 if (isAbsolute()) {
82 rootContext = context.getRootContext().getAbsoluteRootContext();
83 }
84 else {
85 rootContext = new InitialContext(context);
86 }
87 return getSingleNodePointerForSteps(rootContext);
88 }
89 }