au.id.jericho.lib.html
Interface Logger
- WriterLogger
Defines the interface for handling log messages.
It is not usually necessary for users to create implementations of this interface, as
the
LoggerProvider
interface contains several predefined instances which provide the most commonly required
Logger
implementations.
By default, logging is configured automatically according to the algorithm described in the static
Config.LoggerProvider
property.
An instance of a class that implements this interface is used by calling the
Source.setLogger(Logger)
method on the relevant
Source
object.
Four
logging levels are defined in this interface.
The logging level is specified only by the use of different method names, there is no class or type defining the levels.
This makes the code required to wrap other logging frameworks much simpler and more efficient.
The four logging levels are:
IMPLEMENTATION NOTE: Ideally the
java.util.logging.Logger
class could have been used as a basis for logging, even if used to define a wrapper
around other logging frameworks.
This would have avoided the need to define yet another logging interface, but because
java.util.logging.Logger
is implemented very poorly,
it is quite tricky to extend it as a wrapper.
Other logging wrapper frameworks such as
SLF4J or
Jakarta Commons Logging provide good logging interfaces, but to avoid
introducing dependencies it was decided to create this new interface.
void | debug(String message) - Logs a message at the DEBUG level.
|
void | error(String message) - Logs a message at the ERROR level.
|
void | info(String message) - Logs a message at the INFO level.
|
boolean | isDebugEnabled() - Indicates whether logging is enabled at the DEBUG level.
|
boolean | isErrorEnabled() - Indicates whether logging is enabled at the ERROR level.
|
boolean | isInfoEnabled() - Indicates whether logging is enabled at the INFO level.
|
boolean | isWarnEnabled() - Indicates whether logging is enabled at the WARN level.
|
void | warn(String message) - Logs a message at the WARN level.
|
debug
public void debug(String message)
Logs a message at the DEBUG level.
message
- the message to log.
error
public void error(String message)
Logs a message at the ERROR level.
message
- the message to log.
info
public void info(String message)
Logs a message at the INFO level.
message
- the message to log.
isDebugEnabled
public boolean isDebugEnabled()
Indicates whether logging is enabled at the DEBUG level.
true
if logging is enabled at the DEBUG level, otherwise false
.
isErrorEnabled
public boolean isErrorEnabled()
Indicates whether logging is enabled at the ERROR level.
true
if logging is enabled at the ERROR level, otherwise false
.
isInfoEnabled
public boolean isInfoEnabled()
Indicates whether logging is enabled at the INFO level.
true
if logging is enabled at the INFO level, otherwise false
.
isWarnEnabled
public boolean isWarnEnabled()
Indicates whether logging is enabled at the WARN level.
true
if logging is enabled at the WARN level, otherwise false
.
warn
public void warn(String message)
Logs a message at the WARN level.
message
- the message to log.