01: /*
02: * Copyright 1999-2004 The Apache Software Foundation
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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 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 compute(EvalContext context) {
52: return computeValue(context);
53: }
54:
55: /**
56: * Returns the value of the variable.
57: */
58: public Object computeValue(EvalContext context) {
59: return context.getRootContext().getVariableContext(varName);
60: }
61: }
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