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/*
* 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,
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*/
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><ul>
* <li>Relative to UTC</li>
* <li>Relative to the standard offset in force</li>
* <li>Relative to the wall offset (what you would see on a clock on the wall)</li>
* </ul><p>
*/
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;
}
}
}