Package org.geotools.util.logging

Class LoggerAdapter

Object

Logger

LoggerAdapter

Direct Known Subclasses:

Log4J2Logger, Log4JLogger, LogbackLogger

public abstract class LoggerAdapter
extends Logger

An adapter that redirect all Java logging events to an other logging framework. This class redefines the severe, warning, info, config, fine, finer and finest methods as abstract ones. Subclasses should implement those methods in order to map Java logging levels to the backend logging framework.

All log methods are overriden in order to redirect to one of the above-cited methods. Note that this is the opposite approach than the Java logging framework one, which implemented everything on top of Logger.log(LogRecord). This adapter is defined in terms of severe … finest methods instead because external frameworks like Commons-logging don't work with LogRecord, and sometime provides nothing else than convenience methods equivalent to severe … finest.

Restrictions
Because the configuration is expected to be fully controled by the external logging framework, every configuration methods inherited from Logger are disabled:

• addHandler(java.util.logging.Handler) since the handling is performed by the external framework.
• setUseParentHandlers(boolean) since this adapter never delegates to the parent handlers. This is consistent with the previous item and avoid mixing loggings from the external framework with Java loggings.
• setParent(java.util.logging.Logger) since this adapter should not inherits any configuration from a parent logger using the Java logging framework.
• setFilter(java.util.logging.Filter) for keeping this LoggerAdapter simple.

Since LoggerAdapters do not hold any configuration by themself, it is not strictly necessary to add them to the log manager. The adapters can be created, garbage-collected and recreated again while preserving their behavior since their configuration is entirely contained in the external logging framework.

Localization
This logger is always created without resource bundles. Localizations must be performed through explicit calls to logrb or log(LogRecord) methods. This is sufficient for GeoTools needs, which performs all localizations through the latter. Note that these methods will be slower in this LoggerAdapter than the default Logger because this adapter localizes and formats records immediately instead of letting the Handler performs this work only if needed.

Logging levels
If a log record level is not one of the predefined ones, then this class maps to the first level below the specified one. For example if a log record has some level between FINE and FINER, then the finer method will be invoked. See isLoggable(java.util.logging.Level) for implementation tips taking advantage of this rule.

Subclasses
The abstract methods required for subclassing handle redirect message logging to target framework.

Throwable: When adapting to a logging framework that supports logging of Throwables implement log(Level, String, Throwable) if you wish to support this functionality.

Throwable: When adapting to a logging framework that supports logging of Throwables * implement log(Level, String, Throwable) if you wish to support this functionality.

Since:

2.4

Author:

Martin Desruisseaux

See Also:

• Logging

Field Summary

Fields inherited from class Logger

global, GLOBAL_LOGGER_NAME

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	LoggerAdapter(String name)	Creates a new logger.

Method Summary

Modifier and Type	Method	Description
void	addHandler(Handler handler)	Do nothing since this logger adapter does not supports handlers.
abstract void	config(String message)	Logs an CONFIG message.
void	entering(String sourceClass, String sourceMethod)	Logs a method entry to the debug level.
void	entering(String sourceClass, String sourceMethod, Object param)	Logs a method entry to the debug level with one parameter.
void	entering(String sourceClass, String sourceMethod, Object[] params)	Logs a method entry to the debug level with many parameters.
void	exiting(String sourceClass, String sourceMethod)	Logs a method return to the debug level.
void	exiting(String sourceClass, String sourceMethod, Object result)	Logs a method return to the debug level.
abstract void	fine(String message)	Logs a FINE message.
abstract void	finer(String message)	Logs a FINER message.
abstract void	finest(String message)	Logs a FINEST message.
protected Level	getDebugLevel()	Returns the level for entering(java.lang.String, java.lang.String), exiting(java.lang.String, java.lang.String) and throwing(java.lang.String, java.lang.String, java.lang.Throwable) methods.
abstract Level	getLevel()	Returns the level for this logger.
abstract void	info(String message)	Logs an INFO message.
abstract boolean	isLoggable(Level level)	Returns true if the specified level is loggable.
void	log(Level level, String message)	Logs a record at the specified level.
void	log(Level level, String message, Object param)	Logs a record at the specified level.
void	log(Level level, String message, Object[] params)	Logs a record at the specified level.
void	log(Level level, String message, Throwable thrown)	Logs a record at the specified level.
void	log(LogRecord record)	Logs a record.
void	logp(Level level, String sourceClass, String sourceMethod, String message)	Logs a record at the specified level.
void	logp(Level level, String sourceClass, String sourceMethod, String message, Object param)	Logs a record at the specified level.
void	logp(Level level, String sourceClass, String sourceMethod, String message, Object[] params)	Logs a record at the specified level.
void	logp(Level level, String sourceClass, String sourceMethod, String message, Throwable thrown)	Logs a record at the specified level.
void	logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String message)	Logs a localizable record at the specified level.
void	logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String message, Object param)	Logs a localizable record at the specified level.
void	logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String message, Object[] params)	Logs a localizable record at the specified level.
void	logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String message, Throwable thrown)	Logs a localizable record at the specified level.
void	removeHandler(Handler handler)	Do nothing since this logger adapter does not support handlers.
void	setFilter(Filter filter)	Do nothing since this logger adapter does not support filters.
abstract void	setLevel(Level level)	Sets the level for this logger.
void	setParent(Logger parent)	Do nothing since this logger adapter does not support arbitrary parents.
void	setUseParentHandlers(boolean useParentHandlers)	Do nothing since this logger never use parent handlers.
abstract void	severe(String message)	Logs a SEVERE message.
void	throwing(String sourceClass, String sourceMethod, Throwable thrown)	Logs a method failure to the debug level.
String	toString()
abstract void	warning(String message)	Logs a WARNING message.

Methods inherited from class Logger

config, fine, finer, finest, getAnonymousLogger, getAnonymousLogger, getFilter, getGlobal, getHandlers, getLogger, getLogger, getName, getParent, getResourceBundle, getResourceBundleName, getUseParentHandlers, info, log, log, logp, logp, logrb, logrb, logrb, logrb, setResourceBundle, severe, warning

Methods inherited from class Object

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

Constructor Details

LoggerAdapter

protected LoggerAdapter(String name)

Creates a new logger.

Parameters:

name - The logger name.

Method Details

setLevel

public abstract void setLevel(Level level)

Sets the level for this logger. Subclasses must redirect the call to the external logging framework, or do nothing if the level can not be changed programmatically.

Overrides:

setLevel in class Logger

getLevel

public abstract Level getLevel()

Returns the level for this logger. Subclasses shall get this level from the external logging framework.

Overrides:

getLevel in class Logger

getDebugLevel

protected Level getDebugLevel()

Returns the level for entering(java.lang.String, java.lang.String), exiting(java.lang.String, java.lang.String) and throwing(java.lang.String, java.lang.String, java.lang.Throwable) methods. The default implementation returns Level.FINER, which is consistent with the value used in the Java logging framework. Subclasses should override this method if a different debug level is wanted.

isLoggable

public abstract boolean isLoggable(Level level)

Returns true if the specified level is loggable.

Implementation tip
Given that Level.intValue() for all predefined levels are documented in the Level specification and are multiple of 100, given that integer divisions are rounded toward zero and given rule documented in this class javadoc, then logging levels can be efficiently mapped to predefined levels using switch statements as below. This statement has good chances to be compiled to the tableswitch bytecode rather than lookupswitch (see Compiling Switches in The Java Virtual Machine Specification).

Overrides:

isLoggable in class Logger

severe

public abstract void severe(String message)

Logs a SEVERE message.

Overrides:

severe in class Logger

warning

public abstract void warning(String message)

Logs a WARNING message.

Overrides:

warning in class Logger

info

public abstract void info(String message)

Logs an INFO message.

Overrides:

info in class Logger

config

public abstract void config(String message)

Logs an CONFIG message.

Overrides:

config in class Logger

fine

public abstract void fine(String message)

Logs a FINE message.

Overrides:

fine in class Logger

finer

public abstract void finer(String message)

Logs a FINER message.

Overrides:

finer in class Logger

finest

public abstract void finest(String message)

Logs a FINEST message.

Overrides:

finest in class Logger

entering

public void entering(String sourceClass,
 String sourceMethod)

Logs a method entry to the debug level. Compared to the default Logger, this implementation bypass the level check in order to let the backing logging framework do its own check.

Overrides:

entering in class Logger

entering

public void entering(String sourceClass,
 String sourceMethod,
 Object param)

Logs a method entry to the debug level with one parameter. Compared to the default Logger, this implementation bypass the level check in order to let the backing logging framework do its own check.

Overrides:

entering in class Logger

entering

public void entering(String sourceClass,
 String sourceMethod,
 Object[] params)

Logs a method entry to the debug level with many parameters. Compared to the default Logger, this implementation bypass the level check in order to let the backing logging framework do its own check.

Overrides:

entering in class Logger

exiting

public void exiting(String sourceClass,
 String sourceMethod)

Logs a method return to the debug level. Compared to the default Logger, this implementation bypass the level check in order to let the backing logging framework do its own check.

Overrides:

exiting in class Logger

exiting

public void exiting(String sourceClass,
 String sourceMethod,
 Object result)

Logs a method return to the debug level. Compared to the default Logger, this implementation bypass the level check in order to let the backing logging framework do its own check.

Overrides:

exiting in class Logger

throwing

public void throwing(String sourceClass,
 String sourceMethod,
 Throwable thrown)

Logs a method failure to the debug level. Compared to the default Logger, this implementation bypass the level check in order to let the backing logging framework do its own check.

Overrides:

throwing in class Logger

log

public void log(LogRecord record)

Logs a record. The default implementation delegates to logrb.

Overrides:

log in class Logger

log

public void log(Level level,
 String message)

Logs a record at the specified level. The default implementation delegates to one of the severe, warning, info, config, fine, finer or finest methods according the supplied level.

Overrides:

log in class Logger

log

public void log(Level level,
 String message,
 Throwable thrown)

Logs a record at the specified level. The default implementation discards the exception and delegates to log(level, message).

Overrides:

log in class Logger

log

public void log(Level level,
 String message,
 Object param)

Logs a record at the specified level. The defaut implementation delegates to log(level, message, param) where the param array is built from the param object.

Overrides:

log in class Logger

log

public void log(Level level,
 String message,
 Object[] params)

Logs a record at the specified level. The defaut implementation formats the message immediately, then delegates to log(level, message) .

Overrides:

log in class Logger

logp

public void logp(Level level,
 String sourceClass,
 String sourceMethod,
 String message)

Logs a record at the specified level. The defaut implementation discards the source class and source method, then delegates to log(level, message) .

Overrides:

logp in class Logger

logp

public void logp(Level level,
 String sourceClass,
 String sourceMethod,
 String message,
 Throwable thrown)

Logs a record at the specified level. The defaut implementation discards the source class and source method, then delegates to log(level, message, thrown).

Overrides:

logp in class Logger

logp

public void logp(Level level,
 String sourceClass,
 String sourceMethod,
 String message,
 Object param)

Logs a record at the specified level. The defaut implementation delegates to logp(level, sourceClass, sourceMethod, message, param) where the param array is built from the param object.

Note that sourceClass and sourceMethod will be discarted unless the target logp method has been overriden.

Overrides:

logp in class Logger

logp

public void logp(Level level,
 String sourceClass,
 String sourceMethod,
 String message,
 Object[] params)

Logs a record at the specified level. The defaut implementation formats the message immediately, then delegates to logp(level, sourceClass, sourceMethod, message).

Note that sourceClass and sourceMethod will be discarted unless the target logp method has been overriden.

Overrides:

logp in class Logger

logrb

public void logrb(Level level,
 String sourceClass,
 String sourceMethod,
 String bundleName,
 String message)

Logs a localizable record at the specified level. The defaut implementation localizes the message immediately, then delegates to logp(level, sourceClass, sourceMethod, message).

Overrides:

logrb in class Logger

logrb

public void logrb(Level level,
 String sourceClass,
 String sourceMethod,
 String bundleName,
 String message,
 Throwable thrown)

Logs a localizable record at the specified level. The defaut implementation localizes the message immediately, then delegates to logp(level, sourceClass, sourceMethod, message, thrown).

Overrides:

logrb in class Logger

logrb

public void logrb(Level level,
 String sourceClass,
 String sourceMethod,
 String bundleName,
 String message,
 Object param)

Logs a localizable record at the specified level. The defaut implementation localizes the message immediately, then delegates to logp(level, sourceClass, sourceMethod, message, param).

Overrides:

logrb in class Logger

logrb

public void logrb(Level level,
 String sourceClass,
 String sourceMethod,
 String bundleName,
 String message,
 Object[] params)

Logs a localizable record at the specified level. The defaut implementation localizes the message immediately, then delegates to logp(level, sourceClass, sourceMethod, message, params).

Overrides:

logrb in class Logger

addHandler

public void addHandler(Handler handler)

Do nothing since this logger adapter does not supports handlers. The configuration should be fully controlled by the external logging framework (e.g. Commons-logging) instead, which is not expected to use Handler objects.

Overrides:

addHandler in class Logger

removeHandler

public void removeHandler(Handler handler)

Do nothing since this logger adapter does not support handlers.

Overrides:

removeHandler in class Logger

setUseParentHandlers

public void setUseParentHandlers(boolean useParentHandlers)

Do nothing since this logger never use parent handlers. This is consistent with addHandler(java.util.logging.Handler) not allowing to add any handlers, and avoid mixing loggings from the external framework with Java loggings.

Overrides:

setUseParentHandlers in class Logger

setParent

public void setParent(Logger parent)

Do nothing since this logger adapter does not support arbitrary parents. More specifically, it should not inherits any configuration from a parent logger using the Java logging framework.

Overrides:

setParent in class Logger

setFilter

public void setFilter(Filter filter)

Do nothing since this logger adapter does not support filters. It is difficult to query efficiently the filter in this LoggerAdapter architecture (e.g. we would need to make sure that Filter.isLoggable(java.util.logging.LogRecord) is invoked only once even if a log call is cascaded into many other log calls, and this test must works in multi-threads environment).

Overrides:

setFilter in class Logger

toString

public String toString()

Overrides:

toString in class Object