/*=============================================================================
|
| NAME
|
|     DebugLog.java
|
| DESCRIPTION
|
|     Debug logging class used to print messages
|     to file or standard output.
|
| PUBLIC MEMBER FUNCTIONS
|
|    startLog( String filename )
|    off()
|    on()
|    print()
|    println()
|
| EXCEPTIONS
|
|     startLog throws IOException if the file cannot be opened.
|
| NOTES
|
|     
|
| BUGS
|
|     
|
| AUTHOR
|
|     Sean E. O'Connor
|
| LEGAL
|
|     Prentice Version 1.1 - An Artist's Software Apprentice.
|     Copyright (C) 2003-2009 by Sean Erik O'Connor.  All Rights Reserved.
|     
|     Primpoly Version 10.4 - A Program for Computing Primitive Polynomials.
|     Copyright (C) 1999-2009 by Sean Erik O'Connor.  All Rights Reserved.
|
|     This program is free software: you can redistribute it and/or modify
|     it under the terms of the GNU General Public License as published by
|     the Free Software Foundation, either version 3 of the License, or
|     (at your option) any later version.
|
|     This program is distributed in the hope that it will be useful,
|     but WITHOUT ANY WARRANTY; without even the implied warranty of
|     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
|     GNU General Public License for more details.
|
|     You should have received a copy of the GNU General Public License
|     along with this program.  If not, see <http://www.gnu.org/licenses/>.
|     
|     The author's address is artificer!AT!seanerikoconnor!DOT!freeservers!DOT!com
|     with !DOT! replaced by . and the !AT! replaced by @
|
+============================================================================*/

package Prentice ;  // Package name for this project.

import java.io.* ;  // PrintStream

import View.* ;     // Prentice View


public class DebugLog
{
    // Class variables, shared by all instances.
    public    static boolean             on   = true ;
    protected static PrintStream outStream = System.out;

    /** Log to the standard output.
      For example,
          String logFile = "log.out" ;
          Debug.startLog( logFile ) ;
          or
           Debug.startLog( System.out ) ;
    */
    public static void startLog( PrintStream out )
    {
        outStream = out ;
    }


    // Open a file and start logging.
    // Create a new File object from the file nane, then a new output
    // stream from that, then a PrintStream object from that.
    public static void startLog( String filename ) throws IOException
    {
         startLog( new PrintStream(
	               new FileOutputStream(
                   new File( filename ) ) ) ) ;
    }

    // Turn off logging.
    public static void off()
    {
        on = false ;
    }

    // Turn on logging.
    public static void on()
    {
        on = true ;
    }

    // Print a string.
    public static void print( String s )
    {
       if (on) outStream.print( s ) ;
    }

    // Print a string with a newline terminator.
    public static void println(String s)
    {
       if (on) outStream.print( s ) ;
       if (on) outStream.print( "\n" ) ;
    }

    // Just print a newline.
    public static void println()
    {
       if (on) outStream.print( "\n" ) ;
    }
}