package org.lcsim.util.log;
   
   import java.io.PrintWriter;
   import java.io.StringWriter;
   import java.util.Date;
   import java.util.logging.Formatter;
   import java.util.logging.LogRecord;
   
   /**
   * <p>
   * The default log formatter for logging in LCSim, primarily from Driver classes.
   * <p>
   * This will display log messages in the following format:<br/>
   * <pre>date | loggerName | methodName | level | message
   * exception traceback (if exists)</pre>
   * <p>
   * The 
   * 
   * @author Jeremy McCormick <jeremym@slac.stanford.edu>
   *
   */
  public class DefaultLogFormatter extends Formatter {
         
      public DefaultLogFormatter() {        
      }
            
      public String format(LogRecord record) {
          StringBuilder sb = new StringBuilder();
          
          // Append the header.
          sb.append(new Date(record.getMillis()) + " " +
                  record.getLoggerName() + " " + 
                  record.getSourceMethodName() + '\n'); 
  
          // Append the level and message.
          sb.append(record.getLevel().getLocalizedName() + ": " + formatMessage(record) + '\n');
          
          // Append an Exception traceback if applicable.
          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();
      }    
  }