| /* |
| * 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 org.apache.pig.EvalFunc; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.util.UDFContext; |
| import org.joda.time.DateTime; |
| |
| public class CurrentTime extends EvalFunc<DateTime> { |
| private DateTime dateTime; |
| private boolean isInitialized = false; |
| |
| /** |
| * This is a default constructor for Pig reflection purposes. It should |
| * never actually be used. |
| */ |
| public CurrentTime() {} |
| |
| @Override |
| public DateTime exec(Tuple input) throws IOException { |
| // If we are doing compile time calculation |
| if (UDFContext.getUDFContext().isFrontend()) { |
| return new DateTime(); |
| } |
| if (!isInitialized) { |
| String dateTimeValue = UDFContext.getUDFContext().getJobConf().get("pig.job.submitted.timestamp"); |
| if (dateTimeValue == null) { |
| throw new ExecException("pig.job.submitted.timestamp was not set!"); |
| } |
| dateTime = new DateTime(Long.parseLong(dateTimeValue)); |
| isInitialized = true; |
| } |
| return dateTime; |
| } |
| |
| @Override |
| public boolean allowCompileTimeCalculation() { |
| return true; |
| } |
| } |