content: /*
   *    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 2 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, write to the Free Software
   *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   * FileLogger.java
   * Copyright (C) 2008 University of Waikato, Hamilton, New Zealand
   */
  
  package weka.core.logging;
  
  import weka.core.RevisionUtils;
  import weka.core.WekaPackageManager;
  
  import java.io.BufferedWriter;
  import java.io.File;
  import java.io.FileWriter;
  import java.util.Date;
  import java.util.regex.Matcher;
  
  /**
   * A simple file logger, that just logs to a single file. Deletes the file
   * when an object gets instantiated.
   * 
   * @author  fracpete (fracpete at waikato dot ac dot nz)
   * @version $Revision: 7461 $
   */
  public class FileLogger
    extends ConsoleLogger {
  
    /** the log file. */
    protected File m_LogFile;
    
    /** the line feed. */
    protected String m_LineFeed;
    
    /**
     * Initializes the logger.
     */
    protected void initialize() {
      super.initialize();
  
      // log file
      m_LogFile = getLogFile();
      // try to remove file
      try {
        if ((m_LogFile != null) && m_LogFile.exists())
  	m_LogFile.delete();
      }
      catch (Exception e) {
        e.printStackTrace();
      }
      
      // the line feed
      m_LineFeed = System.getProperty("line.separator");
    }
    
    /**
     * Returns the log file to use.
     * 
     * @return		the log file
     */
    protected File getLogFile() {
      String	filename;
      File	result;
      
      filename = m_Properties.getProperty("LogFile", "%w" + File.separator + "weka.log");
      filename = filename.replaceAll("%t", Matcher.quoteReplacement(System.getProperty("java.io.tmpdir")));
      filename = filename.replaceAll("%h", Matcher.quoteReplacement(System.getProperty("user.home")));
      filename = filename.replaceAll("%c", Matcher.quoteReplacement(System.getProperty("user.dir")));
      filename = filename.replaceAll("%w", Matcher.quoteReplacement(WekaPackageManager.WEKA_HOME.toString()));
      if (System.getProperty("%") != null && System.getProperty("%").length() > 0) {
        filename = filename.replaceAll("%%", Matcher.quoteReplacement(System.getProperty("%")));
      }
      
      result = new File(filename);
      
      return result;
    }
    
    /**
     * Appends the given string to the log file (without new line!).
     * 
     * @param s		the string to append
     */
    protected void append(String s) {
      BufferedWriter	writer;
     
      if (m_LogFile == null)
        return;
      
      // append output to file
      try {
        writer = new BufferedWriter(new FileWriter(m_LogFile, true));
        writer.write(s);
        writer.flush();
        writer.close();
      }
      catch (Exception e) {
        // ignored
      }
    }
  
    /**
     * Performs the actual logging. 
     * 
     * @param level	the level of the message
     * @param msg		the message to log
     * @param cls		the classname originating the log event
     * @param method	the method originating the log event
     * @param lineno	the line number originating the log event
     */
    protected void doLog(Level level, String msg, String cls, String method, int lineno) {
      // output to console
      super.doLog(level, msg, cls, method, lineno);
      
      // append output to file
      append(
  	m_DateFormat.format(new Date()) + " " + cls + " " + method + m_LineFeed
  	+ level + ": " + msg + m_LineFeed);
    }
    
    /**
     * Returns the revision string.
     * 
     * @return		the revision
     */
    public String getRevision() {
      return RevisionUtils.extract("$Revision: 7461 $");
    }
  }
  