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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;
    }

}