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/*
* 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.pig.builtin;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.pig.EvalFunc;
import org.apache.pig.FuncSpec;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.joda.time.DateTime;
/**
* GetHour extracts the hour of a day from a DateTime object.
*
*
Jodatime: http://joda-time.sourceforge.net/
*
ISO8601 Date Format: http://en.wikipedia.org/wiki/ISO_8601
*
*
*
* Example usage:
*
* ISOin = LOAD 'test.tsv' USING PigStorage('\t') AS (dt:datetime);
*
* DESCRIBE ISOin;
* ISOin: {dt: datetime}
*
* DUMP ISOin;
*
* (2009-01-07T01:07:01.071Z)
* (2008-02-06T02:06:02.062Z)
* (2007-03-05T03:05:03.053Z)
* ...
*
* truncated = FOREACH ISO in GENERATE GetYear(dt) AS year,
* GetMonth(dt) as month,
* GetWeek(dt) as week,
* GetWeekYear(dt) as weekyear,
* GetDay(dt) AS day,
* GetHour(dt) AS hour,
* GetMinute(dt) AS min,
* GetSecond(dt) AS sec;
* GetMillSecond(dt) AS milli;
*
* DESCRIBE truncated;
* truncated: {year: int,month: int,week: int,weekyear: int,day: int,hour: int,min: int,sec: int,milli: int}
*
* DUMP truncated;
* (2009,1,2,2009,7,1,7,1,71)
* (2008,2,6,2008,6,2,6,2,62)
* (2007,3,10,2007,5,3,5,3,53)
*
*/
public class GetHour extends EvalFunc {
@Override
public Integer exec(Tuple input) throws IOException {
if (input == null || input.size() < 1 || input.get(0) == null) {
return null;
}
return ((DateTime) input.get(0)).getHourOfDay();
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input), DataType.INTEGER));
}
@Override
public List getArgToFuncMapping() throws FrontendException {
List funcList = new ArrayList();
funcList.add(new FuncSpec(this.getClass().getName(), new Schema(new Schema.FieldSchema(null, DataType.DATETIME))));
return funcList;
}
}
