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LogUtils.java

/*
 Copyright (c) 2005, 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 com.mysql.jdbc.Util;
import com.mysql.jdbc.profiler.ProfilerEvent;

00029 public class LogUtils {

    public static final String CALLER_INFORMATION_NOT_AVAILABLE = "Caller information not available";

    private static final String LINE_SEPARATOR = System
                  .getProperty("line.separator");

      private static final int LINE_SEPARATOR_LENGTH = LINE_SEPARATOR.length();

      public static Object expandProfilerEventIfNecessary(
                  Object possibleProfilerEvent) {

            if (possibleProfilerEvent instanceof ProfilerEvent) {
                  StringBuffer msgBuf = new StringBuffer();

                  ProfilerEvent evt = (ProfilerEvent) possibleProfilerEvent;

                  Throwable locationException = evt.getEventCreationPoint();

                  if (locationException == null) {
                        locationException = new Throwable();
                  }

                  msgBuf.append("Profiler Event: [");

                  boolean appendLocationInfo = false;
                  
                  switch (evt.getEventType()) {
                  case ProfilerEvent.TYPE_EXECUTE:
                        msgBuf.append("EXECUTE");

                        break;

                  case ProfilerEvent.TYPE_FETCH:
                        msgBuf.append("FETCH");

                        break;

                  case ProfilerEvent.TYPE_OBJECT_CREATION:
                        msgBuf.append("CONSTRUCT");

                        break;

                  case ProfilerEvent.TYPE_PREPARE:
                        msgBuf.append("PREPARE");

                        break;

                  case ProfilerEvent.TYPE_QUERY:
                        msgBuf.append("QUERY");

                        break;

                  case ProfilerEvent.TYPE_WARN:
                        msgBuf.append("WARN");
                        appendLocationInfo = true;
                        
                        break;
                        
                  case ProfilerEvent.TYPE_SLOW_QUERY:
                        msgBuf.append("SLOW QUERY");
                        appendLocationInfo = false;
                        
                        break;
                        
                  default:
                        msgBuf.append("UNKNOWN");
                  }

                  msgBuf.append("] ");
                  msgBuf.append(findCallingClassAndMethod(locationException));
                  msgBuf.append(" duration: ");
                  msgBuf.append(evt.getEventDuration());
                  msgBuf.append(" ");
                  msgBuf.append(evt.getDurationUnits());
                  msgBuf.append(", connection-id: ");
                  msgBuf.append(evt.getConnectionId());
                  msgBuf.append(", statement-id: ");
                  msgBuf.append(evt.getStatementId());
                  msgBuf.append(", resultset-id: ");
                  msgBuf.append(evt.getResultSetId());

                  String evtMessage = evt.getMessage();

                  if (evtMessage != null) {
                        msgBuf.append(", message: ");
                        msgBuf.append(evtMessage);
                  }

                  if (appendLocationInfo) {
                        msgBuf
                              .append("\n\nFull stack trace of location where event occurred:\n\n");
                        msgBuf.append(Util.stackTraceToString(locationException));
                        msgBuf.append("\n");
                  }
                  
                  return msgBuf;
            }
            
            return possibleProfilerEvent;
      }
      
      public static String findCallingClassAndMethod(Throwable t) {
            String stackTraceAsString = Util.stackTraceToString(t);

            String callingClassAndMethod = CALLER_INFORMATION_NOT_AVAILABLE;

            int endInternalMethods = stackTraceAsString
                        .lastIndexOf("com.mysql.jdbc");

            if (endInternalMethods != -1) {
                  int endOfLine = -1;
                  int compliancePackage = stackTraceAsString.indexOf(
                              "com.mysql.jdbc.compliance", endInternalMethods);

                  if (compliancePackage != -1) {
                        endOfLine = compliancePackage - LINE_SEPARATOR_LENGTH;
                  } else {
                        endOfLine = stackTraceAsString.indexOf(LINE_SEPARATOR,
                                    endInternalMethods);
                  }

                  if (endOfLine != -1) {
                        int nextEndOfLine = stackTraceAsString.indexOf(LINE_SEPARATOR,
                                    endOfLine + LINE_SEPARATOR_LENGTH);

                        if (nextEndOfLine != -1) {
                              callingClassAndMethod = stackTraceAsString.substring(
                                          endOfLine + LINE_SEPARATOR_LENGTH, nextEndOfLine);
                        } else {
                              callingClassAndMethod = stackTraceAsString
                                          .substring(endOfLine + LINE_SEPARATOR_LENGTH);
                        }
                  }
            }

            if (!callingClassAndMethod.startsWith("\tat ") && 
                        !callingClassAndMethod.startsWith("at ")) {
                  return "at " + callingClassAndMethod;
            }

            return callingClassAndMethod;
      }
}

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