com.facebook.presto.jdbc.internal.joda.time.convert.ReadableInstantConverter Maven / Gradle / Ivy
/*
* 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
*/
@Override
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
*/
@Override
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
*/
@Override
public long getInstantMillis(Object object, Chronology chrono) {
return ((ReadableInstant) object).getMillis();
}
//-----------------------------------------------------------------------
/**
* Returns ReadableInstant.class.
*
* @return ReadableInstant.class
*/
public Class getSupportedType() {
return ReadableInstant.class;
}
}