org.apache.log4j.pattern
Class LoggingEventPatternConverter

java.lang.Object
  org.apache.log4j.pattern.PatternConverter
      org.apache.log4j.pattern.LoggingEventPatternConverter

Direct Known Subclasses:

DatePatternConverter, FileLocationPatternConverter, FullLocationPatternConverter, LevelPatternConverter, LineLocationPatternConverter, LineSeparatorPatternConverter, LiteralPatternConverter, MessagePatternConverter, MethodLocationPatternConverter, NamePatternConverter, NDCPatternConverter, PropertiesPatternConverter, RelativeTimePatternConverter, SequenceNumberPatternConverter, ThreadPatternConverter, ThrowableInformationPatternConverter

public abstract class LoggingEventPatternConverter
extends PatternConverter

LoggingEventPatternConverter is a base class for pattern converters that can format information from instances of LoggingEvent.

Author:

Curt Arnold

Constructor Summary

protected

LoggingEventPatternConverter(String name, String style) Constructs an instance of LoggingEventPatternConverter.

Method Summary

abstract void	format(LoggingEvent event, StringBuffer toAppendTo) Formats an event into a string buffer.
void	format(Object obj, StringBuffer output) Formats an object into a string buffer.
boolean	handlesThrowable() Normally pattern converters are not meant to handle Exceptions although few pattern converters might.

Methods inherited from class org.apache.log4j.pattern.PatternConverter

getName, getStyleClass

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LoggingEventPatternConverter

protected LoggingEventPatternConverter(String name,
                                       String style)

Constructs an instance of LoggingEventPatternConverter.

Parameters:

name - name of converter.

style - CSS style for output.

Method Detail

format

public abstract void format(LoggingEvent event,
                            StringBuffer toAppendTo)

Formats an event into a string buffer.

Parameters:

event - event to format, may not be null.

toAppendTo - string buffer to which the formatted event will be appended. May not be null.

format

public void format(Object obj,
                   StringBuffer output)

Formats an object into a string buffer.

Specified by:

format in class PatternConverter

Parameters:

obj - event to format, may not be null.

output - string buffer to which the formatted event will be appended. May not be null.

handlesThrowable

public boolean handlesThrowable()

Normally pattern converters are not meant to handle Exceptions although few pattern converters might. By examining the return values for this method, the containing layout will determine whether it handles throwables or not.

Returns:

true if this PatternConverter handles throwables