/*********************************************************************************************************************** * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu) * * Licensed 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 eu.stratosphere.test.recordJobs.relational.query1Util; import java.util.Iterator; import eu.stratosphere.api.java.record.functions.ReduceFunction; import eu.stratosphere.test.recordJobs.util.Tuple; import eu.stratosphere.types.LongValue; import eu.stratosphere.types.Record; import eu.stratosphere.types.StringValue; import eu.stratosphere.util.Collector; public class GroupByReturnFlag extends ReduceFunction { private static final long serialVersionUID = 1L; @Override public void reduce(Iterator<Record> records, Collector<Record> out) throws Exception { Record outRecord = new Record(); Tuple returnTuple = new Tuple(); long quantity = 0; double extendedPriceSum = 0.0; boolean first = true; while(records.hasNext()) { Record rec = records.next(); Tuple t = rec.getField(1, Tuple.class); if(first) { first = false; rec.copyTo(outRecord); returnTuple.addAttribute(rec.getField(0, StringValue.class).toString()); } long tupleQuantity = Long.parseLong(t.getStringValueAt(4)); quantity += tupleQuantity; double extendedPricePerTuple = Double.parseDouble(t.getStringValueAt(5)); extendedPriceSum += extendedPricePerTuple; } LongValue pactQuantity = new LongValue(quantity); returnTuple.addAttribute("" + pactQuantity); returnTuple.addAttribute("" + extendedPriceSum); outRecord.setField(1, returnTuple); out.collect(outRecord); } }