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 }