//: c08:newcollections:SetPerformance.java
// From Thinking in Java, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
package c08.newcollections;
import java.util.*;

public class SetPerformance {
  private static final int REPS = 200;
  private abstract static class Tester {
    String name;
    Tester(String name) { this.name = name; }
    abstract void test(Set s, int size);
  }
  private static Tester[] tests = {
    new Tester("add") { 
      void test(Set s, int size) {
        for(int i = 0; i < REPS; i++) {
          s.clear();
          Collection1.fill(s, size);
        }
      }
    },
    new Tester("contains") { 
      void test(Set s, int size) {
        for(int i = 0; i < REPS; i++)
          for(int j = 0; j < size; j++)
            s.contains(Integer.toString(j));
      }
    },
    new Tester("iteration") { 
      void test(Set s, int size) {
        for(int i = 0; i < REPS * 10; i++) {
          Iterator it = s.iterator();
          while(it.hasNext())
            it.next();
        }
      }
    },
  };
  public static void test(Set s, int size) {
    // A trick to print out the class name:
    System.out.println("Testing " + 
      s.getClass().getName() + " size " + size);
    Collection1.fill(s, size);
    for(int i = 0; i < tests.length; i++) {
      System.out.print(tests[i].name);
      long t1 = System.currentTimeMillis();
      tests[i].test(s, size);
      long t2 = System.currentTimeMillis();
      System.out.println(": " + 
        ((double)(t2 - t1)/(double)size));
    }
  }
  public static void main(String[] args) {
    // Small:
    test(new TreeSet(), 10);
    test(new HashSet(), 10);
    // Medium:
    test(new TreeSet(), 100);
    test(new HashSet(), 100);
    // Large:
    test(new HashSet(), 1000);
    test(new TreeSet(), 1000);
  }
} ///:~