source: Ballon/web/WEB-INF/lib/mysql-connector-java-5.1.21/src/com/mysql/jdbc/log/StandardLogger.java @ 766

/*
 Copyright (c) 2002, 2012, 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.Date;

import com.mysql.jdbc.Util;
import com.mysql.jdbc.profiler.ProfilerEvent;

/**
 * Provides logging facilities for those platforms that don't have built-in
 * facilities. Simply logs messages to STDERR.
 * 
 * @author Mark Matthews
 * 
 * @version $Id$
 */
public class StandardLogger implements Log {
        private static final int FATAL = 0;

        private static final int ERROR = 1;

        private static final int WARN = 2;

        private static final int INFO = 3;

        private static final int DEBUG = 4;

        private static final int TRACE = 5;

        public static StringBuffer bufferedLog = null;

        private boolean logLocationInfo = true;

        /**
         * Creates a new StandardLogger object.
         * 
         * @param name
         *            the name of the configuration to use -- ignored
         */
        public StandardLogger(String name) {
                this(name, false);
        }

        /**
         * 
         * @param name
         * @param logLocationInfo
         */
        public StandardLogger(String name, boolean logLocationInfo) {
                this.logLocationInfo = logLocationInfo;
        }

        public static void saveLogsToBuffer() {
                if (bufferedLog == null) {
                        bufferedLog = new StringBuffer();
                }
        }

        /**
         * @see com.mysql.jdbc.log.Log#isDebugEnabled()
         */
        public boolean isDebugEnabled() {
                return true;
        }

        /**
         * @see com.mysql.jdbc.log.Log#isErrorEnabled()
         */
        public boolean isErrorEnabled() {
                return true;
        }

        /**
         * @see com.mysql.jdbc.log.Log#isFatalEnabled()
         */
        public boolean isFatalEnabled() {
                return true;
        }

        /**
         * @see com.mysql.jdbc.log.Log#isInfoEnabled()
         */
        public boolean isInfoEnabled() {
                return true;
        }

        /**
         * @see com.mysql.jdbc.log.Log#isTraceEnabled()
         */
        public boolean isTraceEnabled() {
                return true;
        }

        /**
         * @see com.mysql.jdbc.log.Log#isWarnEnabled()
         */
        public boolean isWarnEnabled() {
                return true;
        }

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

        private void logInternal(int level, Object msg, Throwable exception) {
                StringBuffer msgBuf = new StringBuffer();
                msgBuf.append(new Date().toString());
                msgBuf.append(" ");

                switch (level) {
                case FATAL:
                        msgBuf.append("FATAL: ");

                        break;

                case ERROR:
                        msgBuf.append("ERROR: ");

                        break;

                case WARN:
                        msgBuf.append("WARN: ");

                        break;

                case INFO:
                        msgBuf.append("INFO: ");

                        break;

                case DEBUG:
                        msgBuf.append("DEBUG: ");

                        break;

                case TRACE:
                        msgBuf.append("TRACE: ");

                        break;
                }

                if (msg instanceof ProfilerEvent) {
                        msgBuf.append(LogUtils.expandProfilerEventIfNecessary(msg));

                } else {
                        if (this.logLocationInfo && level != TRACE) {
                                Throwable locationException = new Throwable();
                                msgBuf.append(LogUtils
                                                .findCallingClassAndMethod(locationException));
                                msgBuf.append(" ");
                        }
                        
                        if (msg != null) {
                                msgBuf.append(String.valueOf(msg));
                        }
                }

                if (exception != null) {
                        msgBuf.append("\n");
                        msgBuf.append("\n");
                        msgBuf.append("EXCEPTION STACK TRACE:");
                        msgBuf.append("\n");
                        msgBuf.append("\n");
                        msgBuf.append(Util.stackTraceToString(exception));
                }

                String messageAsString = msgBuf.toString();

                System.err.println(messageAsString);

                if (bufferedLog != null) {
                        bufferedLog.append(messageAsString);
                }
        }
}