1 /*
2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /*
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file:
31 *
32 * Copyright (c) 2009-2012, Stephen Colebourne & Michael Nascimento Santos
33 *
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions are met:
38 *
39 * * Redistributions of source code must retain the above copyright notice,
40 * this list of conditions and the following disclaimer.
41 *
42 * * Redistributions in binary form must reproduce the above copyright notice,
43 * this list of conditions and the following disclaimer in the documentation
44 * and/or other materials provided with the distribution.
45 *
46 * * Neither the name of JSR-310 nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
54 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
55 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
56 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
57 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
59 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
60 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 */
62 package build.tools.tzdb;
63
64 import java.util.Objects;
65
66 /**
67 * A definition of the way a local time can be converted to the actual
68 * transition date-time.
69 * <p>
70 * Time zone rules are expressed in one of three ways:
71 * <p><ul>
72 * <li>Relative to UTC</li>
73 * <li>Relative to the standard offset in force</li>
74 * <li>Relative to the wall offset (what you would see on a clock on the wall)</li>
75 * </ul><p>
76 */
77 public enum TimeDefinition {
78 /** The local date-time is expressed in terms of the UTC offset. */
79 UTC,
80 /** The local date-time is expressed in terms of the wall offset. */
81 WALL,
82 /** The local date-time is expressed in terms of the standard offset. */
83 STANDARD;
84
85 /**
86 * Converts the specified local date-time to the local date-time actually
87 * seen on a wall clock.
88 * <p>
89 * This method converts using the type of this enum.
90 * The output is defined relative to the 'before' offset of the transition.
91 * <p>
92 * The UTC type uses the UTC offset.
93 * The STANDARD type uses the standard offset.
94 * The WALL type returns the input date-time.
95 * The result is intended for use with the wall-offset.
96 *
97 * @param dateTime the local date-time, not null
98 * @param standardOffset the standard offset, not null
99 * @param wallOffset the wall offset, not null
100 * @return the date-time relative to the wall/before offset, not null
101 */
102 public LocalDateTime createDateTime(LocalDateTime dateTime, ZoneOffset standardOffset, ZoneOffset wallOffset) {
103 switch (this) {
104 case UTC: {
105 int difference = wallOffset.getTotalSeconds() - ZoneOffset.UTC.getTotalSeconds();
106 return dateTime.plusSeconds(difference);
107 }
108 case STANDARD: {
109 int difference = wallOffset.getTotalSeconds() - standardOffset.getTotalSeconds();
110 return dateTime.plusSeconds(difference);
111 }
112 default: // WALL
113 return dateTime;
114 }
115 }
116
117 }