content: /**
   * 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.aliyun.odps.mapred.example.local.lib.aggregate;
  
  import java.util.ArrayList;
  
  /**
   * This class implements a value aggregator that maintain the maximum of a
   * sequence of long values.
   */
  public class LongValueMax implements ValueAggregator {
  
    long maxVal = Long.MIN_VALUE;
  
    /**
     * the default constructor
     */
    public LongValueMax() {
      reset();
    }
  
    /**
     * add a value to the aggregator
     *
     * @param val
     *     an object whose string representation represents a long value.
     */
    public void addNextValue(Object val) {
      long newVal = Long.parseLong(val.toString());
      if (this.maxVal < newVal) {
        this.maxVal = newVal;
      }
    }
  
    /**
     * add a value to the aggregator
     *
     * @param newVal
     *     a long value.
     */
    public void addNextValue(long newVal) {
      if (this.maxVal < newVal) {
        this.maxVal = newVal;
      }
      ;
    }
  
    /**
     * @return the aggregated value
     */
    public long getVal() {
      return this.maxVal;
    }
  
    /**
     * @return the string representation of the aggregated value
     */
    public String getReport() {
      return "" + maxVal;
    }
  
    /**
     * reset the aggregator
     */
    public void reset() {
      maxVal = Long.MIN_VALUE;
    }
  
    /**
     * @return return an array of one element. The element is a string
     * representation of the aggregated value. The return value is
     * expected to be used by the a combiner.
     */
    public ArrayList<String> getCombinerOutput() {
      ArrayList<String> retv = new ArrayList<String>(1);
      ;
      retv.add("" + maxVal);
      return retv;
    }
  }
  