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 /**

  * Copyright (c) 2012, Ben Fortuna

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  *

  *  o Redistributions of source code must retain the above copyright

  * notice, this list of conditions and the following disclaimer.

  *

  *  o 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.

  *

  *  o Neither the name of Ben Fortuna nor the names of any other 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 net.fortuna.ical4j.model;

 import java.util.Calendar;

 import java.util.Collections;

 import java.util.Date;

 import java.util.List;

 import net.fortuna.ical4j.model.component.Daylight;

 import net.fortuna.ical4j.model.component.Observance;

 import net.fortuna.ical4j.model.component.VTimeZone;

 import net.fortuna.ical4j.model.property.TzId;

 import net.fortuna.ical4j.model.property.TzOffsetTo;

 /**

  * $Id$

  *

  * Created on 13/09/2005

  *

  * A Java timezone implementation based on an underlying VTimeZone

  * definition.

  * @author Ben Fortuna

  */

 public class TimeZone extends java.util.TimeZone {

     private static final long serialVersionUID = -5620979316746547234L;

     private final VTimeZone vTimeZone;

     private final int rawOffset;

     /**

      * Constructs a new instance based on the specified VTimeZone.

      * @param vTimeZone a VTIMEZONE object instance

      */

     public TimeZone(final VTimeZone vTimeZone) {

         this.vTimeZone = vTimeZone;

         final TzId tzId = (TzId) vTimeZone.getProperty(Property.TZID);

         setID(tzId.getValue());

         this.rawOffset = getRawOffset(vTimeZone);

     }

     /**

      * {@inheritDoc}

      */

     public final int getOffset(final int era, final int year, final int month, final int day,

             final int dayOfWeek, final int milliseconds) {

         final Calendar cal = Calendar.getInstance();

         cal.set(Calendar.ERA, era);

         cal.set(Calendar.YEAR, year);

         cal.set(Calendar.MONTH, month);

         cal.set(Calendar.DAY_OF_YEAR, day);

         cal.set(Calendar.DAY_OF_WEEK, dayOfWeek);

         cal.set(Calendar.MILLISECOND, milliseconds);

         final Observance observance = vTimeZone.getApplicableObservance(new DateTime(cal.getTime()));

         if (observance != null) {

             final TzOffsetTo offset = (TzOffsetTo) observance.getProperty(Property.TZOFFSETTO);

             return (int) offset.getOffset().getOffset();

         }

         return 0;

     }

     /**

      * {@inheritDoc}

      */

     public int getOffset(long date) {

         final Observance observance = vTimeZone.getApplicableObservance(new DateTime(date));

         if (observance != null) {

             final TzOffsetTo offset = (TzOffsetTo) observance.getProperty(Property.TZOFFSETTO);

             return (int) offset.getOffset().getOffset();

         }

         return 0;

     }

     /**

      * {@inheritDoc}

      */

     public final int getRawOffset() {

         return rawOffset;

     }

     /**

      * Determines if the specified date is in daylight time according to

      * this timezone. This is done by finding the latest supporting

      * observance for the specified date and identifying whether it is

      * daylight time.

      * @param date a date instance

      * @return true if the specified date is in daylight time, otherwise false

      */

     public final boolean inDaylightTime(final Date date) {

         final Observance observance = vTimeZone.getApplicableObservance(new DateTime(date));

         return (observance != null && observance instanceof Daylight);

     }

     /**

      * {@inheritDoc}

      */

     public final void setRawOffset(final int offsetMillis) {

         throw new UnsupportedOperationException("Updates to the VTIMEZONE object must be performed directly");

     }

     /**

      * {@inheritDoc}

      */

     public final boolean useDaylightTime() {

         final ComponentList daylights = vTimeZone.getObservances().getComponents(Observance.DAYLIGHT);

         return (!daylights.isEmpty());

     }

     /**

      * @return Returns the VTimeZone backing this instance.

      */

     public final VTimeZone getVTimeZone() {

         return vTimeZone;

     }

     private static final int getRawOffset(VTimeZone vt) {

         // per spec, rawoffset is the raw offset at the current date

         final DateTime now = new DateTime();

         List seasonalTimes = vt.getObservances().getComponents(Observance.STANDARD);

         // if no standard time use daylight time..

         if (seasonalTimes.size() == 0) {

             seasonalTimes = vt.getObservances().getComponents(Observance.DAYLIGHT);

         }

         Observance latestSeasonalTime = null;

         Date latestOnset = null;

         for (int i = 0; i < seasonalTimes.size(); i++) {

             Observance seasonalTime = (Observance) seasonalTimes.get(i);

             Date onset = seasonalTime.getLatestOnset(now);

             if (onset == null) {

                 continue;

             }

             if (latestOnset == null || onset.after(latestOnset)) {

                 latestOnset = onset;

                 latestSeasonalTime = seasonalTime;

             }

         }

         if (latestSeasonalTime != null) {

             final TzOffsetTo offsetTo = (TzOffsetTo) latestSeasonalTime.getProperty(Property.TZOFFSETTO);

             if (offsetTo != null) {

                 return (int) offsetTo.getOffset().getOffset();

             }

         }

         return 0;

     }

 }