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
   *
   *     https://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.avro.ipc.stats;
  
  /**
   * Specific implementation of histogram for floats, which also keeps track of
   * basic summary statistics.
   * 
   * @param <B>
   */
  class FloatHistogram<B> extends Histogram<B, Float> {
    private float runningSum;
    private float runningSumOfSquares;
  
    public FloatHistogram(Segmenter<B, Float> segmenter) {
      super(segmenter);
    }
  
    @Override
    public void add(Float value) {
      super.add(value);
      runningSum += value;
      runningSumOfSquares += value * value;
    }
  
    public float getMean() {
      if (totalCount == 0) {
        return Float.NaN;
      }
      return runningSum / totalCount;
    }
  
    public float getUnbiasedStdDev() {
      if (totalCount <= 1) {
        return Float.NaN;
      }
      float mean = getMean();
      return (float) Math.sqrt((runningSumOfSquares - totalCount * mean * mean) / (totalCount - 1));
    }
  }
  