Source code: org/apache/commons/jxpath/servlet/KeywordVariables.java
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.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 }