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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 com.facebook.presto.jdbc.internal.joda.time.convert;

import com.facebook.presto.jdbc.internal.joda.time.Chronology;
import com.facebook.presto.jdbc.internal.joda.time.DateTimeUtils;
import com.facebook.presto.jdbc.internal.joda.time.DateTimeZone;
import com.facebook.presto.jdbc.internal.joda.time.ReadableInstant;
import com.facebook.presto.jdbc.internal.joda.time.chrono.ISOChronology;

/**
 * ReadableInstantConverter extracts milliseconds and chronology from a ReadableInstant.
 *
 * @author Stephen Colebourne
 * @since 1.0
 */
class ReadableInstantConverter extends AbstractConverter
        implements InstantConverter, PartialConverter {

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

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

    //-----------------------------------------------------------------------
    /**
     * Gets the chronology, which is taken from the ReadableInstant.
     * If the chronology on the instant is null, the ISOChronology in the
     * specified time zone is used.
     * If the chronology on the instant is not in the specified zone, it is
     * adapted.
     * 
     * @param object  the ReadableInstant to convert, must not be null
     * @param zone  the specified zone to use, null means default zone
     * @return the chronology, never null
     */
    public Chronology getChronology(Object object, DateTimeZone zone) {
        Chronology chrono = ((ReadableInstant) object).getChronology();
        if (chrono == null) {
            return ISOChronology.getInstance(zone);
        }
        DateTimeZone chronoZone = chrono.getZone();
        if (chronoZone != zone) {
            chrono = chrono.withZone(zone);
            if (chrono == null) {
                return ISOChronology.getInstance(zone);
            }
        }
        return chrono;
    }

    /**
     * Gets the chronology, which is taken from the ReadableInstant.
     * 

* If the passed in chronology is non-null, it is used. * Otherwise the chronology from the instant is used. * * @param object the ReadableInstant to convert, must not be null * @param chrono the chronology to use, null means use that from object * @return the chronology, never null */ public Chronology getChronology(Object object, Chronology chrono) { if (chrono == null) { chrono = ((ReadableInstant) object).getChronology(); chrono = DateTimeUtils.getChronology(chrono); } return chrono; } /** * Extracts the millis from an object of this converter's type. * * @param object the ReadableInstant to convert, must not be null * @param chrono the non-null result of getChronology * @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) { return ((ReadableInstant) object).getMillis(); } //----------------------------------------------------------------------- /** * Returns ReadableInstant.class. * * @return ReadableInstant.class */ public Class getSupportedType() { return ReadableInstant.class; } }





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