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package com.sun.marlin.stats;

Generic histogram based on long statistics
/** * Generic histogram based on long statistics */
public final class Histogram extends StatLong { static final int BUCKET = 2; static final int MAX = 20; static final int LAST = MAX - 1; static final int[] STEPS = new int[MAX]; static { STEPS[0] = 0; STEPS[1] = 1; for (int i = 2; i < MAX; i++) { STEPS[i] = STEPS[i - 1] * BUCKET; } } static int bucket(int val) { for (int i = 1; i < MAX; i++) { if (val < STEPS[i]) { return i - 1; } } return LAST; } private final StatLong[] stats = new StatLong[MAX]; public Histogram(final String name) { super(name); for (int i = 0; i < MAX; i++) { stats[i] = new StatLong(String.format("%5s .. %5s", STEPS[i], ((i + 1 < MAX) ? STEPS[i + 1] : "~"))); } } @Override public void reset() { super.reset(); for (int i = 0; i < MAX; i++) { stats[i].reset(); } } @Override public void add(int val) { super.add(val); stats[bucket(val)].add(val); } @Override public void add(long val) { add((int) val); } @Override public String toString() { final StringBuilder sb = new StringBuilder(2048); super.toString(sb).append(" { "); for (int i = 0; i < MAX; i++) { if (stats[i].count != 0l) { sb.append("\n ").append(stats[i].toString()); } } return sb.append(" }").toString(); } }