SimpleFormatter.java

/* SimpleFormatter.java --
   A class for formatting log records into short human-readable messages
   Copyright (C) 2002, 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)
any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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package java.util.logging;

import gnu.java.lang.CPStringBuilder;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.DateFormat;
import java.util.Date;

/**
 * A <code>SimpleFormatter</code> formats log records into
 * short human-readable messages, typically one or two lines.
 *
 * @author Sascha Brawer (brawer@acm.org)
 */
public class SimpleFormatter
  extends Formatter
{
  /**
   * Constructs a SimpleFormatter.
   */
  public SimpleFormatter()
  {
  }


  /**
   * An instance of a DateFormatter that is used for formatting
   * the time of a log record into a human-readable string,
   * according to the rules of the current locale.  The value
   * is set after the first invocation of format, since it is
   * common that a JVM will instantiate a SimpleFormatter without
   * ever using it.
   */
  private DateFormat dateFormat;

  /**
   * The character sequence that is used to separate lines in the
   * generated stream. Somewhat surprisingly, the Sun J2SE 1.4
   * reference implementation always uses UNIX line endings, even on
   * platforms that have different line ending conventions (i.e.,
   * DOS). The GNU implementation does not replicate this bug.
   *
   * @see Sun bug parade, bug #4462871,
   * "java.util.logging.SimpleFormatter uses hard-coded line separator".
   */
  static final String lineSep = System.getProperty("line.separator");


  /**
   * Formats a log record into a String.
   *
   * @param record the log record to be formatted.
   *
   * @return a short human-readable message, typically one or two
   *   lines.  Lines are separated using the default platform line
   *   separator.
   *
   * @throws NullPointerException if <code>record</code>
   *         is <code>null</code>.
   */
  public String format(LogRecord record)
  {
    CPStringBuilder buf = new CPStringBuilder(180);

    if (dateFormat == null)
      dateFormat = DateFormat.getDateTimeInstance();

    buf.append(dateFormat.format(new Date(record.getMillis())));
    buf.append(' ');
    buf.append(record.getSourceClassName());
    buf.append(' ');
    buf.append(record.getSourceMethodName());
    buf.append(lineSep);

    buf.append(record.getLevel());
    buf.append(": ");
    buf.append(formatMessage(record));

    buf.append(lineSep);

    Throwable throwable = record.getThrown();
    if (throwable != null)
      {
        StringWriter sink = new StringWriter();
        throwable.printStackTrace(new PrintWriter(sink, true));
        buf.append(sink.toString());
      }

    return buf.toString();
  }
}