/*
* 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.piggybank.evaluation.datetime.convert;
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;
import org.joda.time.DateTimeZone;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* <p>ISOToUnix converts ISO8601 datetime strings to Unix Time Longs</p>
* <ul>
* <li>Jodatime: http://joda-time.sourceforge.net/</li>
* <li>ISO8601 Date Format: http://en.wikipedia.org/wiki/ISO_8601</li>
* <li>Unix Time: http://en.wikipedia.org/wiki/Unix_time</li>
* </ul>
* <br />
* <pre>
* Example usage:
*
* REGISTER /Users/me/commiter/piggybank/java/piggybank.jar ;
* REGISTER /Users/me/commiter/piggybank/java/lib/joda-time-1.6.jar ;
*
* DEFINE ISOToUnix org.apache.pig.piggybank.evaluation.datetime.convert.ISOToUnix();
*
* ISOin = LOAD 'test.tsv' USING PigStorage('\t') AS (dt:chararray, dt2:chararray);
*
* DESCRIBE ISOin;
* ISOin: {dt: chararray,dt2: chararray}
*
* DUMP ISOin;
*
* (2009-01-07T01:07:01.000Z,2008-02-01T00:00:00.000Z)
* (2008-02-06T02:06:02.000Z,2008-02-01T00:00:00.000Z)
* (2007-03-05T03:05:03.000Z,2008-02-01T00:00:00.000Z)
* ...
*
* toUnix = FOREACH ISOin GENERATE ISOToUnix(dt) AS unixTime:long;
*
* DESCRIBE toUnix;
* toUnix: {unixTime: long}
*
* DUMP toUnix;
*
* (1231290421000L)
* (1202263562000L)
* (1173063903000L)
* ...
*</pre>
*/
public class ISOToUnix extends EvalFunc<Long> {
@Override
public Long exec(Tuple input) throws IOException
{
if (input == null || input.size() < 1) {
return null;
}
// Set the time to default or the output is in UTC
DateTimeZone.setDefault(DateTimeZone.UTC);
DateTime result = new DateTime(input.get(0).toString());
return result.getMillis();
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input), DataType.LONG));
}
@Override
public List<FuncSpec> getArgToFuncMapping() throws FrontendException {
List<FuncSpec> funcList = new ArrayList<FuncSpec>();
funcList.add(new FuncSpec(this.getClass().getName(), new Schema(new Schema.FieldSchema(null, DataType.CHARARRAY))));
return funcList;
}
}