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Java example source code file (TimeDefinition.java)

This example Java source code file (TimeDefinition.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

localdatetime, standard, timedefinition, utc, util, wall, zoneoffset

The TimeDefinition.java Java example source code

/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * Copyright (c) 2009-2012, Stephen Colebourne & Michael Nascimento Santos
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  * Neither the name of JSR-310 nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package build.tools.tzdb;

import java.util.Objects;

/**
 * A definition of the way a local time can be converted to the actual
 * transition date-time.
 * <p>
 * Time zone rules are expressed in one of three ways:
 * <p>
    * <li>Relative to UTC * <li>Relative to the standard offset in force * <li>Relative to the wall offset (what you would see on a clock on the wall) * </ul>

    */ public enum TimeDefinition { /** The local date-time is expressed in terms of the UTC offset. */ UTC, /** The local date-time is expressed in terms of the wall offset. */ WALL, /** The local date-time is expressed in terms of the standard offset. */ STANDARD; /** * Converts the specified local date-time to the local date-time actually * seen on a wall clock. * <p> * This method converts using the type of this enum. * The output is defined relative to the 'before' offset of the transition. * <p> * The UTC type uses the UTC offset. * The STANDARD type uses the standard offset. * The WALL type returns the input date-time. * The result is intended for use with the wall-offset. * * @param dateTime the local date-time, not null * @param standardOffset the standard offset, not null * @param wallOffset the wall offset, not null * @return the date-time relative to the wall/before offset, not null */ public LocalDateTime createDateTime(LocalDateTime dateTime, ZoneOffset standardOffset, ZoneOffset wallOffset) { switch (this) { case UTC: { int difference = wallOffset.getTotalSeconds() - ZoneOffset.UTC.getTotalSeconds(); return dateTime.plusSeconds(difference); } case STANDARD: { int difference = wallOffset.getTotalSeconds() - standardOffset.getTotalSeconds(); return dateTime.plusSeconds(difference); } default: // WALL return dateTime; } } }

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