| /** |
| * 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 java.util.HashMap; |
| import org.apache.commons.lang.mutable.MutableInt; |
| |
| /** |
| * This operator counts the number of unique occurrences of tuples within each application window. |
| * <p></p> |
| * @displayName Base Unique Key Counter |
| * @category Algorithmic |
| * @tags count |
| * @param <K> |
| * @since 0.3.2 |
| */ |
| public class BaseUniqueKeyCounter<K> extends BaseKeyOperator<K> |
| { |
| /** |
| * Reference counts each tuple |
| * |
| * @param tuple |
| */ |
| public void processTuple(K tuple) |
| { |
| MutableInt i = map.get(tuple); |
| if (i == null) { |
| i = new MutableInt(0); |
| map.put(cloneKey(tuple), i); |
| } |
| i.increment(); |
| } |
| |
| /** |
| * Bucket counting mechanism. |
| */ |
| protected HashMap<K, MutableInt> map = new HashMap<K, MutableInt>(); |
| } |