/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *   http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.myfaces.logging;

 import java.util.logging.Level;

 import java.util.logging.LogRecord;

 /**

  * Private subclass of LogRecord to hide MyfacesLogger in the stack trace.

  */

 class MyfacesLogRecord extends LogRecord 

 {

   public MyfacesLogRecord(Level level, String msg)

   {

     super(level, (msg == null) ? "" : msg);

     _needToInferCaller = true;

   }

   @Override

   public String getSourceClassName()

   {

     if (_needToInferCaller)

     {

         _inferCaller();

     }

     return super.getSourceClassName();

   }

   @Override

   public void setSourceClassName(String sourceClassName)

   {

     _needToInferCaller = false;

     super.setSourceClassName(sourceClassName);

   }

   @Override

   public String getSourceMethodName()

   {

     if (_needToInferCaller)

     {

         _inferCaller();

     }

     return super.getSourceMethodName();

   }

   @Override

   public void setSourceMethodName(String sourceMethodName)

   {

     _needToInferCaller = false;

     super.setSourceMethodName(sourceMethodName);

   }

   // Private method to infer the caller's class and method names

   private void _inferCaller()

   {

     _needToInferCaller = false;

     // Get the stack trace.

     StackTraceElement stack[] = (new Throwable()).getStackTrace();

     // First, search back to a method in the Logger class.

     int i = 0;

     while (i < stack.length)

     {

       StackTraceElement frame = stack[i];

       String cname = frame.getClassName();

       if (cname.equals(_JDK_LOG_CLASS) ||

           cname.equals(_MYFACES_LOG_CLASS))

       {

           break;

       }

       i++;

     }

     // Now search for the first frame before the "Logger" class.

     while (i < stack.length)

     {

       StackTraceElement frame = stack[i];

       String cname = frame.getClassName();

       if (cname.equals(_JDK_LOG_CLASS) ||

           cname.equals(_MYFACES_LOG_CLASS))

       {

         i++;

         continue;

       }

       String mname = frame.getMethodName();

       if ("log".equals(mname) ||

           "_log".equals(mname))

       {

         i++;

         continue;

       }

       // We've found the relevant frame.

       setSourceClassName(cname);

       setSourceMethodName(mname);

       return;

     }

     // Forcibly set both to null, so the LogRecord superclass

     // doesn't try to detect them on its own

     setSourceClassName(null);

     setSourceMethodName(null);

   }

   transient private boolean _needToInferCaller;

   private static final String _JDK_LOG_CLASS = 

     "java.util.logging.Logger";

   private static final String _MYFACES_LOG_CLASS =

     "org.apache.myfaces.logging.MyfacesLogger";

   private static final long serialVersionUID = 1L;

 }