public TempFileAppender() 
{
      super();
}

The default constructor simply calls its parent's constructor.

 public  void append(LoggingEvent event) 
{
 
      if(!checkEntryConditions()) {
          return;
      }
      subAppend(event);
}

This method is called by AppenderSkeleton#doAppend method.

Whenever this method is called, new unique file is created with specified prefix and suffix. The file is closed afterwards.

The format of the output will depend on this appender's layout.

 protected boolean checkEntryConditions() 
{
      return true;
}

This method determines if there is a sense in attempting to append.

 public  void close() 
{
  /* nothing to do */
}

 public String[] getOptionStrings() 
{
      return OptionConverter.concatanateArrays(super.getOptionStrings(),
                 new String[] {PATH_OPTION,PREFIX_OPTION,SUFFIX_OPTION});
}

Retuns the option names for this component

 public boolean requiresLayout() 
{
      return false;
}

 public  void setOption(String key,
    String value) 
{
      super.setOption(key, value);
      if(key.equalsIgnoreCase(PATH_OPTION)) {
	  path = value;
	  if(path==null) {
              errorHandler.error("Path cannot be empty!",null,0);
	  }
	  dir = new File(path);
	  if(!(dir.exists() && dir.isDirectory() && dir.canWrite())) {
              errorHandler.error("Cannot write to directory " + path + "!",null,0);
	  }
      }
      else if(key.equalsIgnoreCase(PREFIX_OPTION)) {
          if(value!=null && value.length() >=3) {
	      prefix = value;
	  } else {
              errorHandler.error("Prefix cannot be shorter than 3 characters!",
	                         null,0);
	  }
      }
      else if(key.equalsIgnoreCase(SUFFIX_OPTION)) {
          if(value!=null && value.length() >=1) {
	      suffix = value;
	  } else {
              errorHandler.error("Suffix cannot be empty!",null,0);
	  }
      }
}

Set TempFileAppender specific options. The recognized options are Path, Prefix and Suffix, i.e. the values of the string constants #PATH_OPTION , #PREFIX_OPTION and respectively #SUFFIX_OPTION . The options of the super class AppenderSkeleton are also recognized.

 protected  void subAppend(LoggingEvent event) 
{
      try {
          File tmp = File.createTempFile(prefix,suffix,dir);
	  Writer out = new BufferedWriter(new FileWriter(tmp));
	  out.write(event.message);
	  out.close();
 /* this Appender is not supposed to be used for logging of Exceptions */
      } catch (Exception e) {
          errorHandler.error("Error during creation of temporary File!",e,1);
      }
}

This method does actual writing