| /** |
| * 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; |
| import org.joda.time.Period; |
| |
| /** |
| * <p>AddDuration returns the result of a DateTime object plus a Duration object</p> |
| * |
| * <ul> |
| * <li>Jodatime: http://joda-time.sourceforge.net/</li> |
| * <li>ISO8601 Duration Format: http://en.wikipedia.org/wiki/ISO_8601#Durations</li> |
| * </ul> |
| * <br /> |
| * <pre> |
| * 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) |
| * |
| * </pre> |
| */ |
| public class AddDuration extends EvalFunc<DateTime> { |
| |
| @Override |
| public DateTime exec(Tuple input) throws IOException { |
| if (input == null || input.size() < 2 || input.get(0) == null || input.get(1) == null) { |
| return null; |
| } |
| |
| return ((DateTime) input.get(0)).plus(new Period((String) input.get(1))); |
| } |
| |
| @Override |
| public Schema outputSchema(Schema input) { |
| return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input), DataType.DATETIME)); |
| } |
| |
| @Override |
| public List<FuncSpec> getArgToFuncMapping() throws FrontendException { |
| List<FuncSpec> funcList = new ArrayList<FuncSpec>(); |
| Schema s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.DATETIME)); |
| s.add(new Schema.FieldSchema(null, DataType.CHARARRAY)); |
| funcList.add(new FuncSpec(this.getClass().getName(), s)); |
| return funcList; |
| } |
| |
| @Override |
| public boolean allowCompileTimeCalculation() { |
| return true; |
| } |
| } |