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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;
GetMonth extracts the week of a week year 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 GetWeek extends EvalFunc<Integer> {
    @Override
    public Integer exec(Tuple inputthrows IOException {
        if (input == null || input.size() < 1 || input.get(0) == null) {
            return null;
        }
        return ((DateTimeinput.get(0)).getWeekOfWeekyear();
    }
    @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>();
        funcList.add(new FuncSpec(this.getClass().getName(), new Schema(new Schema.FieldSchema(null.))));
        return funcList;
    }
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