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Jdk14Logger.java

/*
 Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  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; version 2
  of the License.

  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., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA



 */
package com.mysql.jdbc.log;

import java.util.logging.Level;
import java.util.logging.Logger;

import com.mysql.jdbc.profiler.ProfilerEvent;

/**
 * Logging functionality for JDK1.4
 * 
 * @author Mark Matthews
 * 
 * @version $Id$
 */
00040 public class Jdk14Logger implements Log {
      private static final Level DEBUG = Level.FINE;

      private static final Level ERROR = Level.SEVERE;

      private static final Level FATAL = Level.SEVERE;

      private static final Level INFO = Level.INFO;

      private static final Level TRACE = Level.FINEST;

      private static final Level WARN = Level.WARNING;

      /**
       * The underlying logger from JDK-1.4
       */
00056       protected Logger jdkLogger = null;

      /**
       * Creates a new Jdk14Logger object.
       * 
       * @param name
       *            DOCUMENT ME!
       */
00064       public Jdk14Logger(String name) {
            this.jdkLogger = Logger.getLogger(name);
      }

      /**
       * @see com.mysql.jdbc.log.Log#isDebugEnabled()
       */
00071       public boolean isDebugEnabled() {
            return this.jdkLogger.isLoggable(Level.FINE);
      }

      /**
       * @see com.mysql.jdbc.log.Log#isErrorEnabled()
       */
00078       public boolean isErrorEnabled() {
            return this.jdkLogger.isLoggable(Level.SEVERE);
      }

      /**
       * @see com.mysql.jdbc.log.Log#isFatalEnabled()
       */
00085       public boolean isFatalEnabled() {
            return this.jdkLogger.isLoggable(Level.SEVERE);
      }

      /**
       * @see com.mysql.jdbc.log.Log#isInfoEnabled()
       */
00092       public boolean isInfoEnabled() {
            return this.jdkLogger.isLoggable(Level.INFO);
      }

      /**
       * @see com.mysql.jdbc.log.Log#isTraceEnabled()
       */
00099       public boolean isTraceEnabled() {
            return this.jdkLogger.isLoggable(Level.FINEST);
      }

      /**
       * @see com.mysql.jdbc.log.Log#isWarnEnabled()
       */
00106       public boolean isWarnEnabled() {
            return this.jdkLogger.isLoggable(Level.WARNING);
      }

      /**
       * Logs the given message instance using the 'debug' level
       * 
       * @param message
       *            the message to log
       */
00116       public void logDebug(Object message) {
            logInternal(DEBUG, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'debug' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00128       public void logDebug(Object message, Throwable exception) {
            logInternal(DEBUG, message, exception);
      }

      /**
       * Logs the given message instance using the 'error' level
       * 
       * @param message
       *            the message to log
       */
00138       public void logError(Object message) {
            logInternal(ERROR, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'error' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00150       public void logError(Object message, Throwable exception) {
            logInternal(ERROR, message, exception);
      }

      /**
       * Logs the given message instance using the 'fatal' level
       * 
       * @param message
       *            the message to log
       */
00160       public void logFatal(Object message) {
            logInternal(FATAL, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'fatal' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00172       public void logFatal(Object message, Throwable exception) {
            logInternal(FATAL, message, exception);
      }

      /**
       * Logs the given message instance using the 'info' level
       * 
       * @param message
       *            the message to log
       */
00182       public void logInfo(Object message) {
            logInternal(INFO, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'info' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00194       public void logInfo(Object message, Throwable exception) {
            logInternal(INFO, message, exception);
      }

      /**
       * Logs the given message instance using the 'trace' level
       * 
       * @param message
       *            the message to log
       */
00204       public void logTrace(Object message) {
            logInternal(TRACE, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'trace' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00216       public void logTrace(Object message, Throwable exception) {
            logInternal(TRACE, message, exception);
      }

      /**
       * Logs the given message instance using the 'warn' level
       * 
       * @param message
       *            the message to log
       */
00226       public void logWarn(Object message) {
            logInternal(WARN, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'warn' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00238       public void logWarn(Object message, Throwable exception) {
            logInternal(WARN, message, exception);
      }

      private static final int findCallerStackDepth(StackTraceElement[] stackTrace) {
            int numFrames = stackTrace.length;

            for (int i = 0; i < numFrames; i++) {
                  String callerClassName = stackTrace[i].getClassName();

                  if (!callerClassName.startsWith("com.mysql.jdbc")
                              || callerClassName.startsWith("com.mysql.jdbc.compliance")) {
                        return i;
                  }
            }

            return 0;
      }

      private void logInternal(Level level, Object msg, Throwable exception) {
            //
            // only go through this exercise if the message will actually
            // be logged.
            //

            if (this.jdkLogger.isLoggable(level)) {
                  String messageAsString = null;
                  String callerMethodName = "N/A";
                  String callerClassName = "N/A";
                  int lineNumber = 0;
                  String fileName = "N/A";

                  if (msg instanceof ProfilerEvent) {
                        messageAsString = LogUtils.expandProfilerEventIfNecessary(msg)
                                    .toString();
                  } else {
                        Throwable locationException = new Throwable();
                        StackTraceElement[] locations = locationException
                                    .getStackTrace();

                        int frameIdx = findCallerStackDepth(locations);

                        if (frameIdx != 0) {
                              callerClassName = locations[frameIdx].getClassName();
                              callerMethodName = locations[frameIdx].getMethodName();
                              lineNumber = locations[frameIdx].getLineNumber();
                              fileName = locations[frameIdx].getFileName();
                        }

                        messageAsString = String.valueOf(msg);
                  }

                  if (exception == null) {
                        this.jdkLogger.logp(level, callerClassName, callerMethodName,
                                    messageAsString);
                  } else {
                        this.jdkLogger.logp(level, callerClassName, callerMethodName,
                                    messageAsString, exception);
                  }
            }
      }
}

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