001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.mapred.lib.aggregate;
020
021import org.apache.hadoop.classification.InterfaceAudience;
022import org.apache.hadoop.classification.InterfaceStability;
023
024/**
025 * This class implements a value aggregator that dedupes a sequence of objects.
026 */
027@InterfaceAudience.Public
028@InterfaceStability.Stable
029public class UniqValueCount 
030    extends org.apache.hadoop.mapreduce.lib.aggregate.UniqValueCount 
031    implements ValueAggregator<Object> {
032  /**
033   * the default constructor
034   * 
035   */
036  public UniqValueCount() {
037    super();
038  }
039  
040  /**
041   * constructor
042   * @param maxNum the limit in the number of unique values to keep.
043   *  
044   */
045  public UniqValueCount(long maxNum) {
046    super(maxNum);
047  }
048}