Quadcap Embeddable Database

com/quadcap/jni/Stat.java

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package com.quadcap.jni;

/* Copyright 2000 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.util.HashMap;

/**
 * A simple statistics object
 *
 * @author Stan Bailes
 */
public class Stat {
    HashMap                     prev    = new HashMap();
    String                      name;
    double                      max = Double.MIN_VALUE;
    double                      min = Double.MAX_VALUE;
    double                      sum = 0;
//    double                      sumsq = 0;
    long                        count = 0;

    public Stat(String s) { name = s; }
    
    public void add(double d) {
        if (d > max) max = d;
        if (d < min) min = d;
        sum += d;
//        sumsq += (d * d);
        count++;
    }

    /**
     * Return the arithmetic mean (the "average") of the sample
     */
    public final double getMean() {
        if (count == 0) return 0;
        return sum / (double)count;
    }

    /**
     * Throw out the high and the low before computing the average.
     */
    public double getAdjustedMean() {
        if (count <= 2) return getMean();
        return ((sum - max) - min) / (count - 2);
    }

    public final long getCount() { return count; }

    public double getMin() { return min; }
    public double getMax() { return max; }

    public String getName() { return name; }

    public void setName(String name) {
        this.name = name;
    }

    public double getTotal() { return sum; }

    public void addPrev(String s) {
        Long x = (Long)prev.get(s);
        if (x == null) x = new Long(1);
        else x = new Long(x.longValue() + 1);
        prev.put(s, x);
    }

    public String toString() {
        return "[" + name + "] (" + prev + ")";
    }
}