| /** |
| * 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 com.datatorrent.lib.util; |
| |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.Operator.Unifier; |
| |
| |
| /** |
| * This unifier consumes numbers, and emits the maximum and minimum tuples at the end of each window. |
| * <p> |
| * This unifier uses round robin partitioning. |
| * </p> |
| * @displayName Unifier Range |
| * @category Algorithmic |
| * @tags numeric |
| * @since 0.3.2 |
| */ |
| public class UnifierRange<V extends Number> implements Unifier<HighLow<V>> |
| { |
| public HighLow<V> mergedTuple = null; |
| |
| /** |
| * This is the output port which emits the minimum and maximum. |
| */ |
| public final transient DefaultOutputPort<HighLow<V>> mergedport = new DefaultOutputPort<HighLow<V>>(); |
| |
| /** |
| * combines the tuple into a single final tuple which is emitted in endWindow |
| * @param tuple incoming tuple from a partition |
| */ |
| @Override |
| public void process(HighLow<V> tuple) |
| { |
| if (mergedTuple == null) { |
| mergedTuple = new HighLow(tuple.getHigh(), tuple.getLow()); |
| } else { |
| if (mergedTuple.getHigh().doubleValue() < tuple.getHigh().doubleValue()) { |
| mergedTuple.setHigh(tuple.getHigh()); |
| } |
| if (mergedTuple.getLow().doubleValue() > tuple.getLow().doubleValue()) { |
| mergedTuple.setLow(tuple.getLow()); |
| } |
| } |
| } |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| if (mergedTuple != null) { |
| mergedport.emit(mergedTuple); |
| mergedTuple = null; |
| } |
| } |
| |
| @Override |
| public void setup(OperatorContext context) |
| { |
| } |
| |
| @Override |
| public void teardown() |
| { |
| } |
| } |