| 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; |
| 19 | import java.util.Set; |
| 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 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 getAvailableIDs() { |
| 54 | return Collections.singleton("UTC"); |
| 55 | } |
| 56 | |
| 57 | } |