StringSummaryData.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 parquet.pig.summary;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.codehaus.jackson.annotate.JsonWriteNullProperties;

import parquet.pig.summary.EnumStat.EnumValueCount;


/**
 * Summary data for a String
 *
 * @author Julien Le Dem
 *
 */
@JsonWriteNullProperties(value = false)
public class StringSummaryData extends SummaryData {

  private ValueStat size = new ValueStat();
  private EnumStat values = new EnumStat();

  public void add(String s) {
    super.add(s);
    size.add(s.length());
    values.add(s);
  }

  @Override
  public void merge(SummaryData other) {
    super.merge(other);
    StringSummaryData stringSummaryData = (StringSummaryData) other;
    size.merge(stringSummaryData.size);
    values.merge(stringSummaryData.values);
  }

  public ValueStat getSize() {
    return size;
  }

  public void setSize(ValueStat size) {
    this.size = size;
  }

  public Collection<EnumValueCount> getValues() {
    Collection<EnumValueCount> values2 = values.getValues();
    if (values2 == null) {
      return null;
    }
    List<EnumValueCount> list = new ArrayList<EnumValueCount>(values2);
    Collections.sort(list, new Comparator<EnumValueCount>() {
      @Override
      public int compare(EnumValueCount o1, EnumValueCount o2) {
        return o2.getCount() - o1.getCount();
      }
    });
    return list;
  }

  public void setValues(Collection<EnumValueCount> values) {
    this.values.setValues(values);
  }

}