LogHandler (Starjava TOPCAT API)

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java.lang.Object
- java.util.logging.Handler
- - java.util.logging.MemoryHandler
  - - uk.ac.starlink.topcat.LogHandler

```
public class LogHandler
extends java.util.logging.MemoryHandler
```
Log handler which can provide a window displaying recent log events. Once the window has been displayed, maintaining it may become expensive as the list of events grows, but if it's never displayed no great expense should be incurred (just maintenance of a MemoryHandler).
Since logging is necessarily a system-wide matter, this is a singleton class.

Since:

17 Jun 2005

Author:

Mark Taylor (Starlink)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static LogHandler`	`getInstance()`	Returns the sole instance of this class.
`void`	`showWindow(java.awt.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, reportError, setEncoding, setErrorManager, setFilter, setFormatter, setLevel

Methods inherited from class java.util.logging.MemoryHandler
close, flush, getPushLevel, isLoggable, publish, push, setPushLevel

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - showWindow
```
public void showWindow(java.awt.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 sole instance of this class. A null result may be returned if the Security Manager will not permit logging configuration to be performed.
    
    Returns:
    
    singleton handler

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