Android Open Source - task4java Stopwatch

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License

The source code is released under:
Apache License
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Java Source Code

/*
 *  Copyright (c) 2014 Andree Hagelstein, Maik Schulze, Deutsche Telekom AG. All Rights Reserved.
 *  //  w w w .j  a va  2 s  . c o  m
 *  Filename: Stopwatch.java
 */
package com.task4java;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Stopwatch {
  
    // constants  
    private final long nsPerTick = 100;  
    private final long nsPerMs = 1000000;  
    private final long nsPerSs = 1000000000;  
    private final long nsPerMm = 60000000000L;  
    private final long nsPerHh = 3600000000000L;  
  
    private long startTime = 0;  
    private long stopTime = 0;  
    private boolean running = false;  
      
    /** 
     * Starts measuring elapsed time for an interval. 
     */  
    public void start() {  
        this.startTime = System.nanoTime();         
        this.running = true;  
    }  
      
    /** 
     * Stops measuring elapsed time for an interval. 
     */  
    public void stop() {  
        this.stopTime = System.nanoTime();  
        this.running = false;  
    }  
      
    /** 
     * Stops time interval measurement and resets the elapsed time to zero. 
     */   
    public void reset() {  
        this.startTime = 0;  
        this.stopTime = 0;  
        this.running = false;  
    }  
      
    /** 
     * Gets the total elapsed time measured by the current instance, in nanoseconds. 
     */  
    public long getElapsedTicks() {  
        long elapsed;  
        
        if (running) {  
             elapsed = (System.nanoTime() - startTime);  
        }  
        else {  
            elapsed = (stopTime - startTime);  
        }  
        return elapsed / nsPerTick;  
    }  
      
    /** 
     * Gets the total elapsed time measured by the current instance, in milliseconds. 
     */  
    public long getElapsedMilliseconds() {  
        long elapsed;  
        
        if (running) {  
             elapsed = (System.nanoTime() - startTime);  
        }  
        else {  
            elapsed = (stopTime - startTime);  
        }  
        return elapsed / nsPerMs;  
    }  
      
    /** 
     * Gets the total elapsed time measured by the current instance, in seconds. 
     */  
    public long getElapsedSeconds() {  
        long elapsed;  
        
        if (running) {  
             elapsed = (System.nanoTime() - startTime);  
        }  
        else {  
            elapsed = (stopTime - startTime);  
        }          
        return elapsed / nsPerSs;  
    }  
      
    /** 
     * Gets the total elapsed time measured by the current instance, in minutes. 
     */  
    public long getElapsedMinutes() {  
        long elapsed;  
        
        if (running) {  
             elapsed = (System.nanoTime() - startTime);  
        }  
        else {  
            elapsed = (stopTime - startTime);  
        }          
        return elapsed / nsPerMm;  
    }  
      
    /** 
     * Gets the total elapsed time measured by the current instance, in hours. 
     */  
    public long getElapsedHours() {  
        long elapsed;  
        
        if (running) {  
             elapsed = (System.nanoTime() - startTime);  
        }  
        else {  
            elapsed = (stopTime - startTime);  
        }          
        return elapsed / nsPerHh;  
    }  
      
    /** 
     * Gets the total elapsed time with format 00:00:00.0000000 = 00:mm:ss.SSS + 9999 Ticks 
     */   
    public String getElapsed() {  
        String timeFormatted = "";  
        timeFormatted = this.formatTime(this.getElapsedTicks());          
        return timeFormatted;  
    }  
      
    /** 
     * Gets the total elapsed time with format  
     * 00:00:00.0000000 = 00:mm:ss.SSS + #### Ticks 
     * @param elapsedTicks elapsed ticks between start and stop nano time 
     */   
    private String formatTime(final long elapsedTicks) {          
        
      String formattedTime = "";  
        
      // should be hh:mm:ss.SSS, but 00 starts with 01   
        SimpleDateFormat formatter = new SimpleDateFormat("00:mm:ss.SSS");  
        Calendar calendar = Calendar.getInstance();          
          
        if (elapsedTicks <= 9999) {  
            calendar.setTimeInMillis(0);  
            formattedTime = formatter.format(calendar.getTime()) + String.valueOf(String.format("%04d", elapsedTicks));  
        }  
        else {  
            calendar.setTimeInMillis(elapsedTicks * nsPerTick / nsPerMs);              
            String formattedTicks = String.format("%07d", elapsedTicks);  
            formattedTicks = formattedTicks.substring(formattedTicks.length() - 4);  
            formattedTime = formatter.format(calendar.getTime()) + formattedTicks;  
        }  
        return formattedTime;  
    }  
}
Java Source Code List
