edu.mit.util
Class DebugWindowAppender

java.lang.Object
  |
  +--org.apache.log4j.AppenderSkeleton
        |
        +--edu.mit.util.DebugWindowAppender

All Implemented Interfaces:

org.apache.log4j.Appender, org.apache.log4j.spi.OptionHandler

public class DebugWindowAppender

extends org.apache.log4j.AppenderSkeleton

Fields inherited from class org.apache.log4j.AppenderSkeleton

closed, errorHandler, headFilter, layout, name, tailFilter, threshold

Constructor Summary

DebugWindowAppender()
This default constructor does nothing.

DebugWindowAppender(org.apache.log4j.Layout layout)
Instantiate a DebugWindowAppender and set the output destination to DebugWindow.

Method Summary

void	activateOptions() Does nothing.
void	append(org.apache.log4j.spi.LoggingEvent event) This method is called by the AppenderSkeleton.doAppend(org.apache.log4j.spi.LoggingEvent) method.
protected boolean	checkEntryConditions() This method determines if there is a sense in attempting to append.
void	close() Close this appender instance.
protected void	insert(String name, String text)
boolean	requiresLayout() The WriterAppender requires a layout.
void	setErrorHandler(org.apache.log4j.spi.ErrorHandler eh) Set the ErrorHandler for this WriterAppender and also the underlying QuietWriter if any.
protected void	subAppend(org.apache.log4j.spi.LoggingEvent event) Actual writing occurs here.

Methods inherited from class org.apache.log4j.AppenderSkeleton

addFilter, clearFilters, doAppend, finalize, getErrorHandler, getFilter, getFirstFilter, getLayout, getName, getThreshold, isAsSevereAsThreshold, setLayout, setName, setThreshold

Methods inherited from class java.lang.Object

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

Constructor Detail

DebugWindowAppender

public DebugWindowAppender()

This default constructor does nothing.

DebugWindowAppender

public DebugWindowAppender(org.apache.log4j.Layout layout)

Instantiate a DebugWindowAppender and set the output destination to DebugWindow.

Method Detail

activateOptions

public void activateOptions()

Does nothing.

Overrides:

activateOptions in class org.apache.log4j.AppenderSkeleton

append

public void append(org.apache.log4j.spi.LoggingEvent event)

This method is called by the AppenderSkeleton.doAppend(org.apache.log4j.spi.LoggingEvent) method.

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

Overrides:

append in class org.apache.log4j.AppenderSkeleton

checkEntryConditions

protected boolean checkEntryConditions()

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

It checks whether there is a set output target and also if there is a set layout. If these checks fail, then the boolean value false is returned.

close

public void close()

Close this appender instance. The underlying stream or writer is also closed.

Closed appenders cannot be reused.

Overrides:

close in class org.apache.log4j.AppenderSkeleton

Since:

0.8.4 *

See Also:

#setWriter

setErrorHandler

public void setErrorHandler(org.apache.log4j.spi.ErrorHandler eh)

Set the ErrorHandler for this WriterAppender and also the underlying QuietWriter if any.

Overrides:

setErrorHandler in class org.apache.log4j.AppenderSkeleton

subAppend

protected void subAppend(org.apache.log4j.spi.LoggingEvent event)

Actual writing occurs here.

Most subclasses of WriterAppender will need to override this method.

requiresLayout

public boolean requiresLayout()

The WriterAppender requires a layout. Hence, this method returns true.

Overrides:

requiresLayout in class org.apache.log4j.AppenderSkeleton

insert

protected void insert(String name,
                      String text)