/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tajo.engine.function.datetime;
import org.apache.tajo.catalog.Column;
import org.apache.tajo.common.TajoDataTypes;
import org.apache.tajo.datum.*;
import org.apache.tajo.engine.function.GeneralFunction;
import org.apache.tajo.engine.function.annotation.Description;
import org.apache.tajo.engine.function.annotation.ParamTypes;
import org.apache.tajo.storage.Tuple;
import static org.apache.tajo.common.TajoDataTypes.Type.*;
@Description(
functionName = "date_part",
description = "Extract field from timestamp",
example = "> SELECT date_part('year', timestamp '2014-01-17 10:09:37.5');\n"
+ "2014.0",
returnType = TajoDataTypes.Type.FLOAT8,
paramTypes = {@ParamTypes(paramTypes = {TajoDataTypes.Type.TEXT, TajoDataTypes.Type.TIMESTAMP})}
)
public class DatePartFromTimestamp extends GeneralFunction {
public DatePartFromTimestamp() {
super(new Column[] {
new Column("target", FLOAT8),
new Column("source", TEXT)
});
}
private DatePartExtractorFromTimestamp extractor = null;
@Override
public Datum eval(Tuple params) {
Datum target = params.get(0);
TimestampDatum timestamp = null;
if(target instanceof NullDatum || params.get(1) instanceof NullDatum) {
return NullDatum.get();
}
if(params.get(1) instanceof TimestampDatum) {
timestamp = (TimestampDatum)(params.get(1));
} else {
return NullDatum.get();
}
if (extractor == null) {
String extractType = target.asChars().toLowerCase();
if (extractType.equals("century")) {
extractor = new CenturyExtractorFromTimestamp();
} else if (extractType.equals("day")) {
extractor = new DayExtractorFromTimestamp();
} else if (extractType.equals("decade")) {
extractor = new DecadeExtractorFromTimestamp();
} else if (extractType.equals("dow")) {
extractor = new DowExtractorFromTimestamp();
} else if (extractType.equals("doy")) {
extractor = new DoyExtractorFromTimestamp();
} else if (extractType.equals("epoch")) {
extractor = new EpochExtractorFromTimestamp();
} else if (extractType.equals("hour")) {
extractor = new HourExtractorFromTimestamp();
} else if (extractType.equals("isodow")) {
extractor = new ISODowExtractorFromTimestamp();
} else if (extractType.equals("isoyear")) {
extractor = new ISOYearExtractorFromTimestamp();
} else if (extractType.equals("microseconds")) {
extractor = new MicrosecondsExtractorFromTimestamp();
} else if (extractType.equals("millennium")) {
extractor = new MillenniumExtractorFromTimestamp();
} else if (extractType.equals("milliseconds")) {
extractor = new MillisecondsExtractorFromTimestamp();
} else if (extractType.equals("minute")) {
extractor = new MinuteExtractorFromTimestamp();
} else if (extractType.equals("month")) {
extractor = new MonthExtractorFromTimestamp();
} else if (extractType.equals("quarter")) {
extractor = new QuarterExtractorFromTimestamp();
} else if (extractType.equals("second")) {
extractor = new SecondExtractorFromTimestamp();
} else if (extractType.equals("timezone")) {
extractor = new NullExtractorFromTimestamp();
} else if (extractType.equals("timezone_hour")) {
extractor = new NullExtractorFromTimestamp();
} else if (extractType.equals("timezone_minute")) {
extractor = new NullExtractorFromTimestamp();
} else if (extractType.equals("week")) {
extractor = new WeekExtractorFromTimestamp();
} else if (extractType.equals("year")) {
extractor = new YearExtractorFromTimestamp();
} else {
extractor = new NullExtractorFromTimestamp();
}
}
return extractor.extract(timestamp);
}
private interface DatePartExtractorFromTimestamp {
public Datum extract(TimestampDatum timestamp);
}
private class CenturyExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getCenturyOfEra());
}
}
private class DayExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getDayOfMonth());
}
}
private class DecadeExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) (timestamp.getYear() / 10));
}
}
private class DowExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
Integer tdow = timestamp.getDayOfWeek();
return DatumFactory.createFloat8((double) ((tdow == 7) ? 0 : tdow));
}
}
private class DoyExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getDayOfYear());
}
}
private class EpochExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getUnixTime());
}
}
private class HourExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getHourOfDay());
}
}
private class ISODowExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getDayOfWeek());
}
}
private class ISOYearExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getWeekyear());
}
}
private class MicrosecondsExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) (timestamp.getSecondOfMinute() * 1000000 + timestamp.getMillisOfSecond() * 1000));
}
}
private class MillenniumExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) (((timestamp.getYear() - 1) / 1000) + 1));
}
}
private class MillisecondsExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) (timestamp.getSecondOfMinute() * 1000 + timestamp.getMillisOfSecond()));
}
}
private class MinuteExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getMinuteOfHour());
}
}
private class MonthExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getMonthOfYear());
}
}
private class QuarterExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) (((timestamp.getMonthOfYear() - 1) / 3) + 1));
}
}
private class SecondExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
if (timestamp.getMillisOfSecond() != 0) {
return DatumFactory.createFloat8(timestamp.getSecondOfMinute() + (((double) timestamp.getMillisOfSecond()) / 1000));
} else {
return DatumFactory.createFloat8((double) timestamp.getSecondOfMinute());
}
}
}
private class WeekExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getWeekOfWeekyear());
}
}
private class YearExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return DatumFactory.createFloat8((double) timestamp.getYear());
}
}
private class NullExtractorFromTimestamp implements DatePartExtractorFromTimestamp {
@Override
public Datum extract(TimestampDatum timestamp) {
return NullDatum.get();
}
}
}