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


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.QName;
19 import org.apache.commons.jxpath.ri.EvalContext;
20
21 /**
22  * An element of the compile tree holding a variable reference.
23  *
24  * @author Dmitri Plotnikov
25  * @version $Revision: 1.9 $ $Date: 2004/02/29 14:17:38 $
26  */
27 public class VariableReference extends Expression {
28
29     private QName varName;
30
31     public VariableReference(QName varName) {
32         this.varName = varName;
33     }
34
35     public QName getVariableName() {
36         return varName;
37     }
38
39     public String JavaDoc toString() {
40         return "$" + varName;
41     }
42
43     public boolean isContextDependent() {
44         return false;
45     }
46
47     public boolean computeContextDependent() {
48         return false;
49     }
50
51     public Object JavaDoc compute(EvalContext context) {
52         return computeValue(context);
53     }
54
55     /**
56      * Returns the value of the variable.
57      */
58     public Object JavaDoc computeValue(EvalContext context) {
59         return context.getRootContext().getVariableContext(varName);
60     }
61 }
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