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Java > Open Source Codes > org > apache > commons > jxpath > ri > compiler > LocationPath


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.jxpath.ri.compiler;
17
18 import org.apache.commons.jxpath.ri.EvalContext;
19 import org.apache.commons.jxpath.ri.axes.InitialContext;
20
21 /**
22  * @author Dmitri Plotnikov
23  * @version $Revision: 1.11 $ $Date: 2004/02/29 14:17:39 $
24  */
25 public class LocationPath extends Path {
26
27     private boolean absolute;
28
29     public LocationPath(boolean absolute, Step[] steps) {
30         super(steps);
31         this.absolute = absolute;
32     }
33
34     public boolean isAbsolute() {
35         return absolute;
36     }
37
38     public boolean computeContextDependent() {
39         if (!absolute) {
40             return true;
41         }
42
43         return super.computeContextDependent();
44     }
45
46     public String JavaDoc toString() {
47         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
48         Step steps[] = getSteps();
49         if (steps != null) {
50             for (int i = 0; i < steps.length; i++) {
51                 if (i > 0 || absolute) {
52                     buffer.append('/');
53                 }
54                 buffer.append(steps[i]);
55             }
56         }
57         return buffer.toString();
58     }
59
60     public Object JavaDoc compute(EvalContext context) {
61         // Create a chain of contexts
62 EvalContext rootContext;
63         if (isAbsolute()) {
64             rootContext = context.getRootContext().getAbsoluteRootContext();
65         }
66         else {
67             rootContext = new InitialContext(context);
68         }
69         return evalSteps(rootContext);
70     }
71
72
73     public Object JavaDoc computeValue(EvalContext context) {
74         // Create a chain of contexts
75 EvalContext rootContext;
76         if (isAbsolute()) {
77             rootContext = context.getRootContext().getAbsoluteRootContext();
78         }
79         else {
80             rootContext = new InitialContext(context);
81         }
82         return getSingleNodePointerForSteps(rootContext);
83     }
84 }
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