1 /*
2 * $Id: VelocityScopeExtractor.java 1066512 2011-02-02 16:13:31Z apetrelli $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.tiles.request.velocity.extractor;
22
23 import java.util.Enumeration;
24
25 import org.apache.tiles.request.attribute.AttributeExtractor;
26 import org.apache.velocity.context.Context;
27
28 /**
29 * Extracts attributes from Velocity context..
30 *
31 * @version $Rev: 1066512 $ $Date: 2011-02-03 03:13:31 +1100 (Thu, 03 Feb 2011) $
32 */
33 public class VelocityScopeExtractor implements AttributeExtractor {
34
35 /**
36 * The Velocity context.
37 */
38 private Context context;
39
40 /**
41 * Constructor.
42 *
43 * @param context The Velocity context.
44 */
45 public VelocityScopeExtractor(Context context) {
46 this.context = context;
47 }
48
49 @Override
50 public void removeValue(String name) {
51 context.remove(name);
52 }
53
54 @Override
55 public Enumeration<String> getKeys() {
56 return new KeyEnumeration(context.getKeys());
57 }
58
59 @Override
60 public Object getValue(String key) {
61 return context.get(key);
62 }
63
64 @Override
65 public void setValue(String key, Object value) {
66 context.put(key, value);
67 }
68
69 /**
70 * Enumerates an array.
71 */
72 private static class KeyEnumeration implements Enumeration<String> {
73
74 /**
75 * The current index.
76 */
77 private int index = 0;
78
79 /**
80 * The array to enumerate.
81 */
82 private Object[] keys;
83
84 /**
85 * Constructor.
86 *
87 * @param keys The array to enumerate.
88 */
89 public KeyEnumeration(Object[] keys) {
90 this.keys = keys;
91 }
92
93 @Override
94 public boolean hasMoreElements() {
95 return index < keys.length;
96 }
97
98 @Override
99 public String nextElement() {
100 return (String) keys[index++];
101 }
102 }
103 }