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Java > Open Source Codes > org > joda > time > tz > UTCProvider


1 /*
2  * Copyright 2001-2005 Stephen Colebourne
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.joda.time.tz;
17
18 import java.util.Collections JavaDoc;
19 import java.util.Set JavaDoc;
20 import org.joda.time.DateTimeZone;
21
22 /**
23  * Simple time zone provider that supports only UTC.
24  * <p>
25  * UTCProvider is thread-safe and immutable.
26  *
27  * @author Brian S O'Neill
28  * @since 1.0
29  */
30 public final class UTCProvider implements Provider {
31
32     /**
33      * Constructor.
34      */
35     public UTCProvider() {
36         super();
37     }
38
39     /**
40      * Returns {@link DateTimeZone#UTC UTC} for <code>"UTC"</code>, null
41      * otherwise.
42      */
43     public DateTimeZone getZone(String JavaDoc id) {
44         if ("UTC".equalsIgnoreCase(id)) {
45             return DateTimeZone.UTC;
46         }
47         return null;
48     }
49
50     /**
51      * Returns a singleton collection containing only <code>"UTC"</code>.
52      */
53     public Set JavaDoc getAvailableIDs() {
54         return Collections.singleton("UTC");
55     }
56
57 }
58
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