uk.ac.starlink.topcat

Class LogHandler

java.lang.Object

java.util.logging.Handler

uk.ac.starlink.topcat.LogHandler

public class LogHandler
extends Handler

Log handler which can provide a window displaying recent log events.

Since:

5 Aug 2021

Author:

Mark Taylor (Starlink)

Field Summary

Fields

Modifier and Type	Field and Description
static int	RING_SIZE Maximum number of log records retained.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	LogHandler() Constructor.

Method Summary

Modifier and Type	Method and Description
void	close()
void	flush()
static LogHandler	getInstance() Returns the standard instance of this class.
Color	getRecordColor(LogRecord record) Maps log records to display colours.
void	publish(LogRecord record)
void	showWindow(Component parent) Displays a logging window which displays recent (the last 1000) and any future log messages.

Methods inherited from class java.util.logging.Handler

getEncoding, getErrorManager, getFilter, getFormatter, getLevel, isLoggable, reportError, setEncoding, setErrorManager, setFilter, setFormatter, setLevel

Methods inherited from class java.lang.Object

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

Field Detail

RING_SIZE

public static final int RING_SIZE

Maximum number of log records retained.

See Also:

Constant Field Values

Constructor Detail

LogHandler

protected LogHandler()

Constructor. Invoked lazily by getInstance().

Method Detail

publish

public void publish(LogRecord record)

Specified by:

publish in class Handler

flush

public void flush()

Specified by:

flush in class Handler

close

public void close()

Specified by:

close in class Handler

getRecordColor

public Color getRecordColor(LogRecord record)

Maps log records to display colours.

Parameters:

record - log record

Returns:

display colour

showWindow

public void showWindow(Component parent)

Displays a logging window which displays recent (the last 1000) and any future log messages.

Parameters:

parent - parent component, may be used for positioning

getInstance

public static LogHandler getInstance()

Returns the standard instance of this class.

Returns:

singleton handler