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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;

AddDuration returns the result of a DateTime object plus a Duration object

  • Jodatime: http://joda-time.sourceforge.net/
  • ISO8601 Duration Format: http://en.wikipedia.org/wiki/ISO_8601#Durations

 Example usage:

 ISOin = LOAD 'test.tsv' USING PigStorage('\t') AS (dt:datetime, dr:chararray);

 DESCRIBE ISOin;
 ISOin: {dt: datetime,dr: chararray}

 DUMP ISOin;

 (2009-01-07T01:07:01.000Z,PT1S)
 (2008-02-06T02:06:02.000Z,PT1M)
 (2007-03-05T03:05:03.000Z,P1D)
 ...

 dtadd = FOREACH ISOin GENERATE AddDuration(dt, dr) AS dt1;

 DESCRIBE dtadd;
 dtadd: {dt1: datetime}

 DUMP dtadd;

 (2009-01-07T01:07:02.000Z)
 (2008-02-06T02:07:02.000Z)
 (2007-03-06T03:05:03.000Z)

 
public class AddDuration extends EvalFunc<DateTime> {
    @Override
    public DateTime exec(Tuple inputthrows IOException {
        if (input == null || input.size() < 2) {
            return null;
        }
        
        return ((DateTimeinput.get(0)).plus(new Period((Stringinput.get(1)));
    }
    
    @Override
    public Schema outputSchema(Schema input) {
        return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input), .));
    }
    @Override
    public List<FuncSpecgetArgToFuncMapping() throws FrontendException {
        List<FuncSpecfuncList = new ArrayList<FuncSpec>();
        Schema s = new Schema();
        s.add(new Schema.FieldSchema(null.));
        s.add(new Schema.FieldSchema(null.));
        funcList.add(new FuncSpec(this.getClass().getName(), s));
        return funcList;
    }
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