mapreduce/src/java/org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.java

/**
 * 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.hadoop.mapred.lib.aggregate;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * This class implements a value aggregator that dedupes a sequence of objects.
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class UniqValueCount 
    extends org.apache.hadoop.mapreduce.lib.aggregate.UniqValueCount 
    implements ValueAggregator<Object> {
  /**
   * the default constructor
   * 
   */
  public UniqValueCount() {
    super();
  }
  
  /**
   * constructor
   * @param maxNum the limit in the number of unique values to keep.
   *  
   */
  public UniqValueCount(long maxNum) {
    super(maxNum);
  }
}