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/*
 *  Copyright 2001-2009 Stephen Colebourne
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.joda.time.convert;

import java.util.Calendar;
import java.util.GregorianCalendar;

import org.joda.time.Chronology;
import org.joda.time.DateTimeZone;
import org.joda.time.chrono.BuddhistChronology;
import org.joda.time.chrono.GJChronology;
import org.joda.time.chrono.GregorianChronology;
import org.joda.time.chrono.ISOChronology;
import org.joda.time.chrono.JulianChronology;

/**
 * CalendarConverter converts a java util Calendar to an instant or partial.
 * The Calendar is converted to milliseconds and the chronology that best
 * matches the calendar.
 *
 * @author Stephen Colebourne
 * @since 1.0
 */
final class CalendarConverter extends AbstractConverter
        implements InstantConverter, PartialConverter {

    /**
     * Singleton instance.
     */
    static final CalendarConverter INSTANCE = new CalendarConverter();

    /**
     * Restricted constructor.
     */
    protected CalendarConverter() {
        super();
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the chronology.
     * 

* If a chronology is specified then it is used. * Otherwise, it is the GJChronology if a GregorianCalendar is used, * BuddhistChronology if a BuddhistCalendar is used or ISOChronology otherwise. * The time zone is extracted from the calendar if possible, default used if not. * * @param object the Calendar to convert, must not be null * @param chrono the chronology to use, null means use Calendar * @return the chronology, never null * @throws NullPointerException if the object is null * @throws ClassCastException if the object is an invalid type */ public Chronology getChronology(Object object, Chronology chrono) { if (chrono != null) { return chrono; } Calendar cal = (Calendar) object; DateTimeZone zone = null; try { zone = DateTimeZone.forTimeZone(cal.getTimeZone()); } catch (IllegalArgumentException ex) { zone = DateTimeZone.getDefault(); } return getChronology(cal, zone); } /** * Gets the chronology, which is the GJChronology if a GregorianCalendar is used, * BuddhistChronology if a BuddhistCalendar is used or ISOChronology otherwise. * The time zone specified is used in preference to that on the calendar. * * @param object the Calendar to convert, must not be null * @param zone the specified zone to use, null means default zone * @return the chronology, never null * @throws NullPointerException if the object is null * @throws ClassCastException if the object is an invalid type */ public Chronology getChronology(Object object, DateTimeZone zone) { if (object.getClass().getName().endsWith(".BuddhistCalendar")) { return BuddhistChronology.getInstance(zone); } else if (object instanceof GregorianCalendar) { GregorianCalendar gc = (GregorianCalendar) object; long cutover = gc.getGregorianChange().getTime(); if (cutover == Long.MIN_VALUE) { return GregorianChronology.getInstance(zone); } else if (cutover == Long.MAX_VALUE) { return JulianChronology.getInstance(zone); } else { return GJChronology.getInstance(zone, cutover, 4); } } else { return ISOChronology.getInstance(zone); } } /** * Gets the millis, which is the Calendar millis value. * * @param object the Calendar to convert, must not be null * @param chrono the chronology result from getChronology, non-null * @return the millisecond value * @throws NullPointerException if the object is null * @throws ClassCastException if the object is an invalid type */ public long getInstantMillis(Object object, Chronology chrono) { Calendar calendar = (Calendar) object; return calendar.getTime().getTime(); } //----------------------------------------------------------------------- /** * Returns Calendar.class. * * @return Calendar.class */ public Class getSupportedType() { return Calendar.class; } }





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