| /* |
| * 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>UnixToISO converts Unix Time Long datetimes to ISO8601 datetime strings</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 UnixToISO org.apache.pig.piggybank.evaluation.datetime.convert.UnixToISO(); |
| * |
| * UnixIn = LOAD 'test2.tsv' USING PigStorage('\t') AS (dt:long); |
| * |
| * DESCRIBE UnixIn; |
| * UnixIn: {dt: long} |
| * |
| * DUMP UnixIn; |
| * |
| * (1231290421000L) |
| * (1233885962000L) |
| * (1236222303000L) |
| * |
| * toISO = FOREACH UnixIn GENERATE UnixToISO(dt) AS ISOTime:chararray; |
| * |
| * DESCRIBE toISO; |
| * toISO: {ISOTime: chararray} |
| * |
| * DUMP toISO; |
| * |
| * (2009-01-07T01:07:01.000Z) |
| * (2009-02-06T02:06:02.000Z) |
| * (2009-03-05T03:05:03.000Z) |
| * ... |
| * </pre> |
| */ |
| |
| public class UnixToISO extends EvalFunc<String> { |
| |
| @Override |
| public String 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(DataType.toLong(input.get(0))); |
| |
| return result.toString(); |
| } |
| |
| @Override |
| public Schema outputSchema(Schema input) { |
| return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input), DataType.CHARARRAY)); |
| } |
| |
| @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.LONG)))); |
| |
| return funcList; |
| } |
| } |