org.apache.log
Class Hierarchy

java.lang.Object
  |
  +--org.apache.log.Hierarchy

public class Hierarchy

extends Object

This class encapsulates a basic independent log hierarchy. The hierarchy is essentially a safe wrapper around root logger.

Author:

Avalon Development Team, Peter Donald

Constructor Summary

Hierarchy()
Create a hierarchy object.

Method Summary

void	addLoggerListener(LoggerListener loggerListener) Set the LoggerListener associated with hierarchy.
static Hierarchy	getDefaultHierarchy() Retrieve the default hierarchy.
Logger	getLoggerFor(String category) Retrieve a logger for named category.
Logger	getRootLogger() Utility method to retrieve logger for hierarchy.
void	log(String message) Deprecated. Logging components should use ErrorHandler rather than Hierarchy.log()
void	log(String message, Throwable throwable) Deprecated. Logging components should use ErrorHandler rather than Hierarchy.log()
void	removeLoggerListener(LoggerListener loggerListener) Remove the LoggerListener associated with hierarchy.
void	setDefaultLogTarget(LogTarget target) Set the default log target for hierarchy.
void	setDefaultLogTargets(LogTarget[] targets) Set the default log targets for this hierarchy.
void	setDefaultPriority(Priority priority) Set the default priority for hierarchy.
void	setErrorHandler(ErrorHandler errorHandler) Set the ErrorHandler associated with hierarchy.

Methods inherited from class java.lang.Object

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

Constructor Detail

Hierarchy

public Hierarchy()

Create a hierarchy object. The default LogTarget writes to stdout.

Method Detail

getDefaultHierarchy

public static Hierarchy getDefaultHierarchy()

Retrieve the default hierarchy.

In most cases the default LogHierarchy is the only one used in an application. However when security is a concern or multiple independent applications will be running in same JVM it is advantageous to create new Hierarchies rather than reuse default.

Returns:

the default Hierarchy

setDefaultLogTarget

public void setDefaultLogTarget(LogTarget target)

Set the default log target for hierarchy. This is the target inherited by loggers if no other target is specified.

Parameters:

target - the default target

setDefaultLogTargets

public void setDefaultLogTargets(LogTarget[] targets)

Set the default log targets for this hierarchy. These are the targets inherited by loggers if no other targets are specified

Parameters:

targets - the default targets

setDefaultPriority

public void setDefaultPriority(Priority priority)

Set the default priority for hierarchy. This is the priority inherited by loggers if no other priority is specified.

Parameters:

priority - the default priority

setErrorHandler

public void setErrorHandler(ErrorHandler errorHandler)

Set the ErrorHandler associated with hierarchy.

Parameters:

errorHandler - the ErrorHandler

addLoggerListener

public void addLoggerListener(LoggerListener loggerListener)

Set the LoggerListener associated with hierarchy. This is a unicast listener, so only one LoggerListener is allowed.

Parameters:

loggerListener - the LoggerListener

Throws:

UnsupportedOperationException - if no more LoggerListeners are permitted.

removeLoggerListener

public void removeLoggerListener(LoggerListener loggerListener)

Remove the LoggerListener associated with hierarchy. Perform this step before adding a new one if you want to change it.

Parameters:

loggerListener - the LoggerListener

getLoggerFor

public Logger getLoggerFor(String category)

Retrieve a logger for named category.

Parameters:

category - the context

Returns:

the Logger

log

public void log(String message,
                Throwable throwable)

Deprecated. Logging components should use ErrorHandler rather than Hierarchy.log()

Logs an error message to error handler. Default Error Handler is stderr.

Parameters:

message - a message to log

throwable - a Throwable to log

log

public void log(String message)

Deprecated. Logging components should use ErrorHandler rather than Hierarchy.log()

Logs an error message to error handler. Default Error Handler is stderr.

Parameters:

message - a message to log

getRootLogger

public final Logger getRootLogger()

Utility method to retrieve logger for hierarchy. This method is intended for use by sub-classes which can take responsibility for manipulating Logger directly.

Returns:

the Logger