org.nineml.logging

Class Logger

java.lang.Object

org.nineml.logging.Logger

Direct Known Subclasses:

CachingLogger, DefaultLogger, SystemLogger

public abstract class Logger
extends java.lang.Object

The abstract class that all concrete loggers must extend.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEBUG The log level for debug messages.
static java.lang.String	defaultLogLevelProperty The system property for setting the default log level.
static int	ERROR The log level for error messages.
static int	INFO The log level for informational messages.
static java.lang.String	logcategory The logging catagory for logger messages.
static java.lang.String	logLevelsProperty The system property for setting the category:loglevel mappings.
static int	SILENT The log level to indicate no logging, not even errors.
static int	TRACE The log level for trace messages.
static int	WARNING The log level for warning messages.

Constructor Summary

Constructors

Constructor and Description
Logger()

Method Summary

Modifier and Type	Method and Description
void	clearLogLevels() Clear the log levels.
abstract void	debug(java.lang.String category, java.lang.String format, java.lang.Object... params) Issue a debug message.
abstract void	error(java.lang.String category, java.lang.String format, java.lang.Object... params) Issue an error message.
int	getDefaultLogLevel() Get the default log level
java.util.Set<java.lang.String>	getLogCategories() Get all of the configured log level categories
int	getLogLevel(java.lang.String category) Get the log level for a particular category.
abstract void	info(java.lang.String category, java.lang.String format, java.lang.Object... params) Issue an informational message.
void	readSystemProperties() Set the log levels by reading system properties.
void	setDefaultLogLevel(int level) Set the default log level.
void	setDefaultLogLevel(java.lang.String level) Set the default log level.
void	setLogLevel(java.lang.String category, int level) Set the log level for a particular category.
void	setLogLevel(java.lang.String category, java.lang.String level) Set the log level for a particular category.
void	setLogLevels(java.lang.String config) Set the log levels for a set of categories.
abstract void	trace(java.lang.String category, java.lang.String format, java.lang.Object... params) Issue a trace message.
abstract void	warn(java.lang.String category, java.lang.String format, java.lang.Object... params) Issue a warning message.

Methods inherited from class java.lang.Object

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

Field Detail

logcategory

public static final java.lang.String logcategory

The logging catagory for logger messages.

See Also:

Constant Field Values

defaultLogLevelProperty

public static final java.lang.String defaultLogLevelProperty

The system property for setting the default log level.

See Also:

Constant Field Values

logLevelsProperty

public static final java.lang.String logLevelsProperty

The system property for setting the category:loglevel mappings.

See Also:

Constant Field Values

SILENT

public static final int SILENT

The log level to indicate no logging, not even errors.

See Also:

Constant Field Values

ERROR

public static final int ERROR

The log level for error messages.

See Also:

Constant Field Values

WARNING

public static final int WARNING

The log level for warning messages.

See Also:

Constant Field Values

INFO

public static final int INFO

The log level for informational messages.

See Also:

Constant Field Values

DEBUG

public static final int DEBUG

The log level for debug messages.

See Also:

Constant Field Values

TRACE

public static final int TRACE

The log level for trace messages.

See Also:

Constant Field Values

Constructor Detail

Logger

public Logger()

Method Detail

readSystemProperties

public void readSystemProperties()

Set the log levels by reading system properties.

The properties are:

• defaultLogLevelProperty

  Must be an integer specifying the initial default log level or one of the strings "silent", "error", "warning", "info", "debug", or "trace". Absent this property, the default level is 5, or "error".

• logLevelsProperty

  This property specifies a mapping between log categories and the log level for each category. The format of the property is a list of comma or space separated values of the form "category:level". The category "*" sets the default log level.

getDefaultLogLevel

public int getDefaultLogLevel()

Get the default log level

Returns:

the default log level

setDefaultLogLevel

public void setDefaultLogLevel(int level)

Set the default log level.

If the level is less than zero, it will be set to 0 (silent).

Parameters:

level - the level

setDefaultLogLevel

public void setDefaultLogLevel(java.lang.String level)

Set the default log level.

The level must be "silent", "error", "warning", "info", "debug", or "trace". If an invalid value is specified, "error" is used.

Parameters:

level - the level.

Throws:

java.lang.NullPointerException - if the level is null.

getLogCategories

public java.util.Set<java.lang.String> getLogCategories()

Get all of the configured log level categories

Returns:

the set of categories

getLogLevel

public int getLogLevel(java.lang.String category)

Get the log level for a particular category.

Category names are not case sensitive.

Parameters:

category - the category

Returns:

the level

Throws:

java.lang.NullPointerException - if the category is null

setLogLevel

public void setLogLevel(java.lang.String category,
                        int level)

Set the log level for a particular category.

Parameters:

category - the category

level - the level

Throws:

java.lang.NullPointerException - if the category is null.

setLogLevel

public void setLogLevel(java.lang.String category,
                        java.lang.String level)

Set the log level for a particular category.

The level must be "silent", "error", "warning", "info", "debug", or "trace". If an invalid value is specified, "error" is used.

Parameters:

category - the category.

level - the level.

Throws:

java.lang.NullPointerException - if the category or level is null.

setLogLevels

public void setLogLevels(java.lang.String config)

Set the log levels for a set of categories.

The config specifies a mapping between log categories and the log level for each category. The format of the string is a list of comma or space separated values of the form "category:level".

The level must be an integer or one of "silent", "error", "warning", "info", "debug", or "trace". If an invalid value is specified, "error" is used. The category "*" sets the default log level.

Parameters:

config - the category.

clearLogLevels

public void clearLogLevels()

Clear the log levels.

This method removes all configured log levels. All subsequent logging (until more levels are set) will be based entirely on the default log level.

error

public abstract void error(java.lang.String category,
                           java.lang.String format,
                           java.lang.Object... params)

Issue an error message.

Parameters:

category - the message category

format - the format string

params - message parameters

warn

public abstract void warn(java.lang.String category,
                          java.lang.String format,
                          java.lang.Object... params)

Issue a warning message.

Parameters:

category - the message category

format - the format string

params - message parameters

info

public abstract void info(java.lang.String category,
                          java.lang.String format,
                          java.lang.Object... params)

Issue an informational message.

Parameters:

category - the message category

format - the format string

params - message parameters

debug

public abstract void debug(java.lang.String category,
                           java.lang.String format,
                           java.lang.Object... params)

Issue a debug message.

Parameters:

category - the message category

format - the format string

params - message parameters

trace

public abstract void trace(java.lang.String category,
                           java.lang.String format,
                           java.lang.Object... params)

Issue a trace message.

Parameters:

category - the message category

format - the format string

params - message parameters