logformatter.java

p2p仿真

/*
 * @(#)LogFormatter.java	ver 1.2  6/20/2005
 *
 * Copyright 2005 Weishuai Yang ([e-mail]). 
 * All rights reserved.
 * 
 */
 
package gps.util;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.logging.LogRecord;

/**
 * formats log records
 * 
 * 
 * @author  Weishuai Yang
 * @version 1.2,  6/20/2005
 */
public class LogFormatter extends java.util.logging.Formatter {
	
    /**
     * debug or not, if true includes real time
     */
    boolean mDebug=false;
    
    /**
     * dummy constructor
     *
     */
    public LogFormatter(){ }
    
    /**
     * constructs a log formatter object
     * @param debug debug or not
     */
    public LogFormatter(boolean debug){
    	mDebug=debug;	
    }
    

    
    /**
     * Line separator string.  This is the value of the line.separator
     * property at the moment that the SimpleFormatter was created.
     *  
     */
    private String lineSeparator = (String) java.security.AccessController.doPrivileged(
               new sun.security.action.GetPropertyAction("line.separator"));

    /**
     * Format the given LogRecord.
     * @param record the log record to be formatted.
     * @return a formatted log record
     */
    public synchronized String format(LogRecord record) {
	StringBuffer sb = new StringBuffer();
	String message = formatMessage(record);
	if(mDebug){
	    sb.append(record.getLevel().getLocalizedName());
	    sb.append(": ");
	}
	sb.append(message);
	sb.append(lineSeparator);
	if (record.getThrown() != null) {
	    try {
	        StringWriter sw = new StringWriter();
	        PrintWriter pw = new PrintWriter(sw);
	        record.getThrown().printStackTrace(pw);
	        pw.close();
		sb.append(sw.toString());
	    } catch (Exception ex) {
	    }
	}
	return sb.toString();
    }
    

    /** 
    * prints a formatted number following printf conventions
    * @param fmt the format string
    * @param x the double to print
    * @return the formated string
    */
    
     public static String sprintf(String fmt, double x)
     {  
         return(new Format(fmt).form(x));
     }

    /** 
    * prints a formatted number following printf conventions
    * @param fmt the format string
    * @param x the long to print
    * @return the formated string
    */
    public static String sprintf(String fmt, long x)
     {   return(new Format(fmt).form(x));
     }

    /** 
    * prints a formatted number following printf conventions
    * @param fmt the format string
    * @param x the character to 
    * @return the formated string
    */
    
     public static String sprintf(String fmt, char x)
     {  return(new Format(fmt).form(x));
     }

    /** 
    * prints a formatted number following printf conventions
    * @param x a string that represents the digits to print
    * @return the formated string
    */
    
     public static String sprintf(String fmt, String x)
     {  return(new Format(fmt).form(x));
     }
     /**
      * a test stub for the format class
      */
      
      public static void main(String[] a)
      {  double x = 1.23456789012;
         double y = 123;
         double z = 1.2345e30;
         double w = 1.02;
         double u = 1.234e-5;
         int d = 0xCAFE;
         System.out.println(LogFormatter.sprintf("x = |%f|\n", x));
         System.out.println(LogFormatter.sprintf("u = |%20f|\n", u));
         System.out.println(LogFormatter.sprintf("x = |% .5f|\n", x));
         System.out.println(LogFormatter.sprintf("w = |%20.5f|\n", w));
         System.out.println(LogFormatter.sprintf("x = |%020.5f|\n", x));
         System.out.println(LogFormatter.sprintf("x = |%+20.5f|\n", x));
         System.out.println(LogFormatter.sprintf("x = |%+020.5f|\n", x));
         System.out.println(LogFormatter.sprintf("x = |% 020.5f|\n", x));
         System.out.println(LogFormatter.sprintf("y = |%#+20.5f|\n", y));
         System.out.println(LogFormatter.sprintf("y = |%-+20.5f|\n", y));
         System.out.println(LogFormatter.sprintf("z = |%20.5f|\n", z));
         
         System.out.println(LogFormatter.sprintf("x = |%e|\n", x));
         System.out.println(LogFormatter.sprintf("u = |%20e|\n", u));
         System.out.println(LogFormatter.sprintf("x = |% .5e|\n", x));
         System.out.println(LogFormatter.sprintf("w = |%20.5e|\n", w));
         System.out.println(LogFormatter.sprintf("x = |%020.5e|\n", x));
         System.out.println(LogFormatter.sprintf("x = |%+20.5e|\n", x));
         System.out.println(LogFormatter.sprintf("x = |%+020.5e|\n", x));
         System.out.println(LogFormatter.sprintf("x = |% 020.5e|\n", x));
         System.out.println(LogFormatter.sprintf("y = |%#+20.5e|\n", y));
         System.out.println(LogFormatter.sprintf("y = |%-+20.5e|\n", y));
         
         System.out.println(LogFormatter.sprintf("x = |%g|\n", x));
         System.out.println(LogFormatter.sprintf("z = |%g|\n", z));
         System.out.println(LogFormatter.sprintf("w = |%g|\n", w));
         System.out.println(LogFormatter.sprintf("u = |%g|\n", u));
         System.out.println(LogFormatter.sprintf("y = |%.2g|\n", y));
         System.out.println(LogFormatter.sprintf("y = |%#.2g|\n", y));

         System.out.println(LogFormatter.sprintf("d = |%d|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%20d|\n", d));            
         System.out.println(LogFormatter.sprintf("d = |%020d|\n", d));    
         System.out.println(LogFormatter.sprintf("d = |%+20d|\n", d));
         System.out.println(LogFormatter.sprintf("d = |% 020d|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%-20d|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%20.8d|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%x|\n", d));            
         System.out.println(LogFormatter.sprintf("d = |%20X|\n", d));    
         System.out.println(LogFormatter.sprintf("d = |%#20x|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%020X|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%20.8x|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%o|\n", d));            
         System.out.println(LogFormatter.sprintf("d = |%020o|\n", d));    
         System.out.println(LogFormatter.sprintf("d = |%#20o|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%#020o|\n", d));
         System.out.println(LogFormatter.sprintf("d = |%20.12o|\n", d));
         
         System.out.println(LogFormatter.sprintf("s = |%-20s|\n", "Hello"));      
         System.out.println(LogFormatter.sprintf("s = |%-20c|\n", '!'));      

         // regression test to confirm fix of reported bugs

         System.out.println(LogFormatter.sprintf("|%i|\n", Long.MIN_VALUE));

         System.out.println(LogFormatter.sprintf("|%6.2e|\n", 0.0));
         System.out.println(LogFormatter.sprintf("|%6.2g|\n", 0.0));

         System.out.println(LogFormatter.sprintf("|%6.2f|\n", 9.99));
         System.out.println(LogFormatter.sprintf("|%6.2f|\n", 9.999));

         System.out.println(LogFormatter.sprintf("|%6.0f|\n", 9.999));
      }
}