1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/net/fortuna/ical4j/model/TimeZone.java Tue Feb 10 18:12:00 2015 +0100
1.3 @@ -0,0 +1,177 @@
1.4 +/**
1.5 + * Copyright (c) 2012, Ben Fortuna
1.6 + * All rights reserved.
1.7 + *
1.8 + * Redistribution and use in source and binary forms, with or without
1.9 + * modification, are permitted provided that the following conditions
1.10 + * are met:
1.11 + *
1.12 + * o Redistributions of source code must retain the above copyright
1.13 + * notice, this list of conditions and the following disclaimer.
1.14 + *
1.15 + * o Redistributions in binary form must reproduce the above copyright
1.16 + * notice, this list of conditions and the following disclaimer in the
1.17 + * documentation and/or other materials provided with the distribution.
1.18 + *
1.19 + * o Neither the name of Ben Fortuna nor the names of any other contributors
1.20 + * may be used to endorse or promote products derived from this software
1.21 + * without specific prior written permission.
1.22 + *
1.23 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.24 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.25 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.26 + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.27 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.28 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.29 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.30 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.31 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.32 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.33 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.34 + */
1.35 +package net.fortuna.ical4j.model;
1.36 +
1.37 +import java.util.Calendar;
1.38 +import java.util.Collections;
1.39 +import java.util.Date;
1.40 +import java.util.List;
1.41 +
1.42 +import net.fortuna.ical4j.model.component.Daylight;
1.43 +import net.fortuna.ical4j.model.component.Observance;
1.44 +import net.fortuna.ical4j.model.component.VTimeZone;
1.45 +import net.fortuna.ical4j.model.property.TzId;
1.46 +import net.fortuna.ical4j.model.property.TzOffsetTo;
1.47 +
1.48 +/**
1.49 + * $Id$
1.50 + *
1.51 + * Created on 13/09/2005
1.52 + *
1.53 + * A Java timezone implementation based on an underlying VTimeZone
1.54 + * definition.
1.55 + * @author Ben Fortuna
1.56 + */
1.57 +public class TimeZone extends java.util.TimeZone {
1.58 +
1.59 + private static final long serialVersionUID = -5620979316746547234L;
1.60 +
1.61 + private final VTimeZone vTimeZone;
1.62 + private final int rawOffset;
1.63 +
1.64 + /**
1.65 + * Constructs a new instance based on the specified VTimeZone.
1.66 + * @param vTimeZone a VTIMEZONE object instance
1.67 + */
1.68 + public TimeZone(final VTimeZone vTimeZone) {
1.69 + this.vTimeZone = vTimeZone;
1.70 + final TzId tzId = (TzId) vTimeZone.getProperty(Property.TZID);
1.71 + setID(tzId.getValue());
1.72 + this.rawOffset = getRawOffset(vTimeZone);
1.73 + }
1.74 +
1.75 + /**
1.76 + * {@inheritDoc}
1.77 + */
1.78 + public final int getOffset(final int era, final int year, final int month, final int day,
1.79 + final int dayOfWeek, final int milliseconds) {
1.80 +
1.81 + final Calendar cal = Calendar.getInstance();
1.82 + cal.set(Calendar.ERA, era);
1.83 + cal.set(Calendar.YEAR, year);
1.84 + cal.set(Calendar.MONTH, month);
1.85 + cal.set(Calendar.DAY_OF_YEAR, day);
1.86 + cal.set(Calendar.DAY_OF_WEEK, dayOfWeek);
1.87 + cal.set(Calendar.MILLISECOND, milliseconds);
1.88 + final Observance observance = vTimeZone.getApplicableObservance(new DateTime(cal.getTime()));
1.89 + if (observance != null) {
1.90 + final TzOffsetTo offset = (TzOffsetTo) observance.getProperty(Property.TZOFFSETTO);
1.91 + return (int) offset.getOffset().getOffset();
1.92 + }
1.93 + return 0;
1.94 + }
1.95 +
1.96 + /**
1.97 + * {@inheritDoc}
1.98 + */
1.99 + public int getOffset(long date) {
1.100 + final Observance observance = vTimeZone.getApplicableObservance(new DateTime(date));
1.101 + if (observance != null) {
1.102 + final TzOffsetTo offset = (TzOffsetTo) observance.getProperty(Property.TZOFFSETTO);
1.103 + return (int) offset.getOffset().getOffset();
1.104 + }
1.105 + return 0;
1.106 + }
1.107 +
1.108 + /**
1.109 + * {@inheritDoc}
1.110 + */
1.111 + public final int getRawOffset() {
1.112 + return rawOffset;
1.113 + }
1.114 +
1.115 + /**
1.116 + * Determines if the specified date is in daylight time according to
1.117 + * this timezone. This is done by finding the latest supporting
1.118 + * observance for the specified date and identifying whether it is
1.119 + * daylight time.
1.120 + * @param date a date instance
1.121 + * @return true if the specified date is in daylight time, otherwise false
1.122 + */
1.123 + public final boolean inDaylightTime(final Date date) {
1.124 + final Observance observance = vTimeZone.getApplicableObservance(new DateTime(date));
1.125 + return (observance != null && observance instanceof Daylight);
1.126 + }
1.127 +
1.128 + /**
1.129 + * {@inheritDoc}
1.130 + */
1.131 + public final void setRawOffset(final int offsetMillis) {
1.132 + throw new UnsupportedOperationException("Updates to the VTIMEZONE object must be performed directly");
1.133 + }
1.134 +
1.135 + /**
1.136 + * {@inheritDoc}
1.137 + */
1.138 + public final boolean useDaylightTime() {
1.139 + final ComponentList daylights = vTimeZone.getObservances().getComponents(Observance.DAYLIGHT);
1.140 + return (!daylights.isEmpty());
1.141 + }
1.142 +
1.143 + /**
1.144 + * @return Returns the VTimeZone backing this instance.
1.145 + */
1.146 + public final VTimeZone getVTimeZone() {
1.147 + return vTimeZone;
1.148 + }
1.149 +
1.150 + private static final int getRawOffset(VTimeZone vt) {
1.151 + // per spec, rawoffset is the raw offset at the current date
1.152 + final DateTime now = new DateTime();
1.153 +
1.154 + List seasonalTimes = vt.getObservances().getComponents(Observance.STANDARD);
1.155 + // if no standard time use daylight time..
1.156 + if (seasonalTimes.size() == 0) {
1.157 + seasonalTimes = vt.getObservances().getComponents(Observance.DAYLIGHT);
1.158 + }
1.159 + Observance latestSeasonalTime = null;
1.160 + Date latestOnset = null;
1.161 + for (int i = 0; i < seasonalTimes.size(); i++) {
1.162 + Observance seasonalTime = (Observance) seasonalTimes.get(i);
1.163 + Date onset = seasonalTime.getLatestOnset(now);
1.164 + if (onset == null) {
1.165 + continue;
1.166 + }
1.167 + if (latestOnset == null || onset.after(latestOnset)) {
1.168 + latestOnset = onset;
1.169 + latestSeasonalTime = seasonalTime;
1.170 + }
1.171 + }
1.172 + if (latestSeasonalTime != null) {
1.173 + final TzOffsetTo offsetTo = (TzOffsetTo) latestSeasonalTime.getProperty(Property.TZOFFSETTO);
1.174 + if (offsetTo != null) {
1.175 + return (int) offsetTo.getOffset().getOffset();
1.176 + }
1.177 + }
1.178 + return 0;
1.179 + }
1.180 +}
