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.servlet;
17:
18: import org.apache.commons.jxpath.Variables;
19:
20: /**
21: * Implementation of the Variables interface that provides access
22: * to a single object using a reserved name (keyword).
23: *
24: * @author Dmitri Plotnikov
25: * @version $Revision: 1.6 $ $Date: 2004/02/29 14:17:40 $
26: */
27: public class KeywordVariables implements Variables {
28:
29: private String keyword;
30: private Object object;
31:
32: public KeywordVariables(String keyword, Object object) {
33: this .keyword = keyword;
34: this .object = object;
35: }
36:
37: public boolean isDeclaredVariable(String variable) {
38: return variable.equals(keyword);
39: }
40:
41: public Object getVariable(String variable) {
42: if (variable.equals(keyword)) {
43: return object;
44: }
45: return null;
46: }
47:
48: public void declareVariable(String variable, Object value) {
49: throw new UnsupportedOperationException(
50: "Cannot declare new keyword variables.");
51: }
52:
53: public void undeclareVariable(String variable) {
54: throw new UnsupportedOperationException(
55: "Cannot declare new keyword variables.");
56: }
57: }
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