/*
    * 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 org.apache.commons.lang3;
  
  import java.text.NumberFormat;
  import java.util.Calendar;
  
  /**
   * Tests the difference in performance between CharUtils and CharSet.
   *
   * Sample runs:
  
  Now: Thu Mar 18 14:29:48 PST 2004
  Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.3.1_10-b03
  Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.3.1_10-b03
  Windows XP 5.1 x86 pentium i486 i386
  Do nothing: 0 milliseconds.
  run_CharUtils_isAsciiNumeric: 4,545 milliseconds.
  run_inlined_CharUtils_isAsciiNumeric: 3,417 milliseconds.
  run_inlined_CharUtils_isAsciiNumeric: 85,679 milliseconds.
  
  Now: Thu Mar 18 14:24:51 PST 2004
  Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
  Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.4.2_04-b05
  Windows XP 5.1 x86 pentium i486 i386
  Do nothing: 0 milliseconds.
  run_CharUtils_isAsciiNumeric: 2,578 milliseconds.
  run_inlined_CharUtils_isAsciiNumeric: 2,477 milliseconds.
  run_inlined_CharUtils_isAsciiNumeric: 114,429 milliseconds.
  
  Now: Thu Mar 18 14:27:55 PST 2004
  Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
  Sun Microsystems Inc. Java HotSpot(TM) Server VM 1.4.2_04-b05
  Windows XP 5.1 x86 pentium i486 i386
  Do nothing: 0 milliseconds.
  run_CharUtils_isAsciiNumeric: 630 milliseconds.
  run_inlined_CharUtils_isAsciiNumeric: 709 milliseconds.
  run_inlined_CharUtils_isAsciiNumeric: 84,420 milliseconds.
  
   */
  public class CharUtilsPerfRun {
  
      private static final int WARM_UP = 100;
  
      private static final int COUNT = 5000;
  
      private static final char[] ALL_CHARS;
  
      static {
          ALL_CHARS = new char[Character.MAX_VALUE];
          for (char i = Character.MIN_VALUE; i < Character.MAX_VALUE; i++) {
              ALL_CHARS[i] = i;
          }
      }
  
      public static void main(final String[] args) {
          new CharUtilsPerfRun().run();
      }
  
      private void printlnTotal(final String prefix, final long startMillis) {
          final long totalMillis = System.currentTimeMillis() - startMillis;
          System.out.println(prefix + ": " + NumberFormat.getInstance().format(totalMillis) + " milliseconds.");
      }
  
      private void printSysInfo() {
          System.out.println("Now: " + Calendar.getInstance().getTime());
          System.out.println(SystemProperties.getJavaVendor()
                  + " "
                  + SystemProperties.getJavaRuntimeName()
                  + " "
                  + SystemProperties.getJavaRuntimeVersion());
          System.out.println(SystemProperties.getJavaVmVendor()
                  + " "
                  + SystemProperties.getJavaVmName()
                  + " "
                  + SystemProperties.getJavaVmVersion());
          System.out.println(SystemProperties.getOsName()
              + " "
              + SystemProperties.getOsVersion()
              + " "
              + SystemProperties.getOsArch()
              + " "
              + System.getProperty("sun.cpu.isalist"));
      }
 
     private void run() {
         this.printSysInfo();
         long startMillis;
         startMillis = System.currentTimeMillis();
         this.printlnTotal("Do nothing", startMillis);
         run_CharUtils_isAsciiNumeric(WARM_UP);
         startMillis = System.currentTimeMillis();
         run_CharUtils_isAsciiNumeric(COUNT);
         this.printlnTotal("run_CharUtils_isAsciiNumeric", startMillis);
         run_inlined_CharUtils_isAsciiNumeric(WARM_UP);
         startMillis = System.currentTimeMillis();
         run_inlined_CharUtils_isAsciiNumeric(COUNT);
         this.printlnTotal("run_inlined_CharUtils_isAsciiNumeric", startMillis);
         run_CharSet(WARM_UP);
         startMillis = System.currentTimeMillis();
         run_CharSet(COUNT);
         this.printlnTotal("run_CharSet", startMillis);
     }
 
     private int run_CharSet(final int loopCount) {
         int t = 0;
         for (int i = 0; i < loopCount; i++) {
             for (final char ch : ALL_CHARS) {
                 final boolean b = CharSet.ASCII_NUMERIC.contains(ch);
                 t += b ? 1 : 0;
             }
         }
         return t;
     }
 
     private int run_CharUtils_isAsciiNumeric(final int loopCount) {
         int t = 0;
         for (int i = 0; i < loopCount; i++) {
             for (final char ch : ALL_CHARS) {
                 final boolean b = CharUtils.isAsciiNumeric(ch);
                 t += b ? 1 : 0;
             }
         }
         return t;
     }
 
     private int run_inlined_CharUtils_isAsciiNumeric(final int loopCount) {
         int t = 0;
         for (int i = 0; i < loopCount; i++) {
             for (final char ch : ALL_CHARS) {
                 final boolean b = ch >= '0' && ch <= '9';
                 t += b ? 1 : 0;
             }
         }
         return t;
     }
 }