/**
* 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.plan.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 org.apache.tajo.util.datetime.TimeMeta;
import static org.apache.tajo.common.TajoDataTypes.Type.*;
@Description(
functionName = "date_part",
description = "Extract field from date",
example = "> SELECT date_part('month', date '2014-01-17');\n"
+ "1.0",
returnType = TajoDataTypes.Type.FLOAT8,
paramTypes = {@ParamTypes(paramTypes = {TajoDataTypes.Type.TEXT, TajoDataTypes.Type.DATE})}
)
public class DatePartFromDate extends GeneralFunction {
public DatePartFromDate() {
super(new Column[] {
new Column("target", FLOAT8),
new Column("source", TEXT)
});
}
private DatePartExtractorFromDate extractor = null;
@Override
public Datum eval(Tuple params) {
if (params.isBlankOrNull(0) || params.isBlankOrNull(1) || params.type(1) != DATE) {
return NullDatum.get();
}
TimeMeta timeMeta = params.getTimeDate(1);
if (extractor == null) {
String extractType = params.getText(0).toLowerCase();
if (extractType.equals("century")) {
extractor = new CenturyExtractorFromDate();
} else if (extractType.equals("day")) {
extractor = new DayExtractorFromDate();
} else if (extractType.equals("decade")) {
extractor = new DecadeExtractorFromDate();
} else if (extractType.equals("dow")) {
extractor = new DowExtractorFromDate();
} else if (extractType.equals("doy")) {
extractor = new DoyExtractorFromDate();
} else if (extractType.equals("isodow")) {
extractor = new ISODowExtractorFromDate();
} else if (extractType.equals("isoyear")) {
extractor = new ISOYearExtractorFromDate();
} else if (extractType.equals("millennium")) {
extractor = new MillenniumExtractorFromDate();
} else if (extractType.equals("month")) {
extractor = new MonthExtractorFromDate();
} else if (extractType.equals("quarter")) {
extractor = new QuarterExtractorFromDate();
} else if (extractType.equals("week")) {
extractor = new WeekExtractorFromDate();
} else if (extractType.equals("year")) {
extractor = new YearExtractorFromDate();
} else {
extractor = new NullExtractorFromDate();
}
}
return extractor.extract(timeMeta);
}
private interface DatePartExtractorFromDate {
public Datum extract(TimeMeta timeMeta);
}
private static class CenturyExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.getCenturyOfEra());
}
}
private static class DayExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.dayOfMonth);
}
}
private static class DecadeExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((timeMeta.years / 10.0d));
}
}
private static class DowExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.getDayOfWeek());
}
}
private static class DoyExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.getDayOfYear());
}
}
private static class ISODowExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.getISODayOfWeek());
}
}
private static class ISOYearExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.getWeekyear());
}
}
private static class MillenniumExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) (((timeMeta.years - 1) / 1000) + 1));
}
}
private static class MonthExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.monthOfYear);
}
}
private static class QuarterExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) (((timeMeta.monthOfYear - 1) / 3) + 1));
}
}
private static class WeekExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.getWeekOfYear());
}
}
private static class YearExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return DatumFactory.createFloat8((double) timeMeta.years);
}
}
private static class NullExtractorFromDate implements DatePartExtractorFromDate {
@Override
public Datum extract(TimeMeta timeMeta) {
return NullDatum.get();
}
}
}