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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 toString() {
47          StringBuffer buffer = new StringBuffer();
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 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 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  }