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log4cpp::Category(3) Library Functions Manual log4cpp::Category(3)

NAME

log4cpp::Category - This is the central class in the log4j package.

SYNOPSIS

#include <Category.hh>

Inherited by log4cpp::FixedContextCategory.

Public Member Functions


virtual ~Category ()
Destructor for Category. virtual const std::string & getName () const LOG4CPP_NOTHROW
Return the category name. virtual void setPriority (Priority::Value priority)
Set the priority of this Category. virtual Priority::Value getPriority () const LOG4CPP_NOTHROW
Returns the assigned Priority, if any, for this Category. virtual Priority::Value getChainedPriority () const LOG4CPP_NOTHROW
Starting from this Category, search the category hierarchy for a set priority and return it. virtual bool isPriorityEnabled (Priority::Value priority) const LOG4CPP_NOTHROW
Returns true if the chained priority of the Category is equal to or higher than given priority. virtual void addAppender (Appender *appender)
Adds an Appender to this Category. virtual void addAppender (Appender &appender)
Adds an Appender for this Category. void setAppender (Appender *appender)
Adds an Appender to this Category. void setAppender (Appender &appender)
Adds an Appender for this Category. virtual Appender * getAppender () const
Returns the first Appender for this Category, or NULL if no Appender has been set. virtual Appender * getAppender (const std::string &name) const
Returns the specified Appender for this Category, or NULL if the Appender is not attached to this Category. virtual AppenderSet getAllAppenders () const
Returns the set of Appenders currently attached to this Catogory. virtual void removeAllAppenders ()
Removes all appenders for this Category. virtual void removeAppender (Appender *appender)
Removes specified appender for this Category. virtual bool ownsAppender () const LOG4CPP_NOTHROW
Returns true if the Category owns the first Appender in its Appender set. virtual bool ownsAppender (Appender *appender) const LOG4CPP_NOTHROW
Returns true if the Category owns the Appender. virtual void callAppenders (const LoggingEvent &event) LOG4CPP_NOTHROW
Call the appenders in the hierarchy starting at this. virtual void setAdditivity (bool additivity)
Set the additivity flag for this Category instance. virtual bool getAdditivity () const LOG4CPP_NOTHROW
Returns the additivity flag for this Category instance. virtual Category * getParent () LOG4CPP_NOTHROW
Returns the parent category of this category, or NULL if the category is the root category. virtual const Category * getParent () const LOG4CPP_NOTHROW
Returns the parent category of this category, or NULL if the category is the root category. virtual void log (Priority::Value priority, const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with the specified priority. virtual void log (Priority::Value priority, const std::string &message) LOG4CPP_NOTHROW
Log a message with the specified priority. virtual void logva (Priority::Value priority, const char *stringFormat, va_list va) LOG4CPP_NOTHROW
Log a message with the specified priority. void debug (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with debug priority. void debug (const std::string &message) LOG4CPP_NOTHROW
Log a message with debug priority. bool isDebugEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority DEBUG. CategoryStream debugStream ()
Return a CategoryStream with priority DEBUG. void info (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with info priority. void info (const std::string &message) LOG4CPP_NOTHROW
Log a message with info priority. bool isInfoEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority INFO. CategoryStream infoStream ()
Return a CategoryStream with priority INFO. void notice (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with notice priority. void notice (const std::string &message) LOG4CPP_NOTHROW
Log a message with notice priority. bool isNoticeEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority NOTICE. CategoryStream noticeStream ()
Return a CategoryStream with priority NOTICE. void warn (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with warn priority. void warn (const std::string &message) LOG4CPP_NOTHROW
Log a message with warn priority. bool isWarnEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority WARN. CategoryStream warnStream ()
Return a CategoryStream with priority WARN. void error (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with error priority. void error (const std::string &message) LOG4CPP_NOTHROW
Log a message with error priority. bool isErrorEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority ERROR. CategoryStream errorStream ()
Return a CategoryStream with priority ERROR. void crit (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with crit priority. void crit (const std::string &message) LOG4CPP_NOTHROW
Log a message with crit priority. bool isCritEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority CRIT. CategoryStream critStream ()
Return a CategoryStream with priority CRIT. void alert (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with alert priority. void alert (const std::string &message) LOG4CPP_NOTHROW
Log a message with alert priority. bool isAlertEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority ALERT. CategoryStream alertStream () LOG4CPP_NOTHROW
Return a CategoryStream with priority ALERT. void emerg (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with emerg priority. void emerg (const std::string &message) LOG4CPP_NOTHROW
Log a message with emerg priority. bool isEmergEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority EMERG. CategoryStream emergStream ()
Return a CategoryStream with priority EMERG. void fatal (const char *stringFormat,...) LOG4CPP_NOTHROW
Log a message with fatal priority. void fatal (const std::string &message) LOG4CPP_NOTHROW
Log a message with fatal priority. bool isFatalEnabled () const LOG4CPP_NOTHROW
Return true if the Category will log messages with priority FATAL. CategoryStream fatalStream ()
Return a CategoryStream with priority FATAL. virtual CategoryStream getStream (Priority::Value priority)
Return a CategoryStream with given Priority. virtual CategoryStream operator<< (Priority::Value priority)
Return a CategoryStream with given Priority.

Static Public Member Functions


static Category & getRoot ()
Return the root of the Category hierarchy. static void setRootPriority (Priority::Value priority)
Set the priority of the root Category. static Priority::Value getRootPriority () LOG4CPP_NOTHROW
Get the priority of the root Category. static Category & getInstance (const std::string &name)
Instantiate a Category with name name. static Category * exists (const std::string &name)
If the named category exists (in the default hierarchy) then it returns a reference to the category, otherwise it returns NULL. static std::vector< Category * > * getCurrentCategories ()
Returns all the currently defined categories as a vector of Category pointers. static void shutdown ()
This method will remove all Appenders from Categories.XXX. static void shutdownForced ()
This method will remove all Appenders from Categories.XXX and delete all appenders.

Protected Member Functions


Category (const std::string &name, Category *parent, Priority::Value priority=Priority::NOTSET)
Constructor. virtual void _logUnconditionally (Priority::Value priority, const char *format, va_list arguments) LOG4CPP_NOTHROW
virtual void _logUnconditionally2 (Priority::Value priority, const std::string &message) LOG4CPP_NOTHROW
Unconditionally log a message with the specified priority.

Friends


class HierarchyMaintainer

Detailed Description

This is the central class in the log4j package.

One of the distintive features of log4j (and hence log4cpp) are hierarchal categories and their evaluation.

Constructor & Destructor Documentation

log4cpp::Category::~Category () [virtual]

Destructor for Category.

log4cpp::Category::Category (const std::string & name, Category * parent, Priority::Value priority = Priority::NOTSET) [protected]

Constructor.

Parameters

name the fully qualified name of this Category
parent the parent of this parent, or NULL for the root Category
priority the priority for this Category. Defaults to Priority::NOTSET

Member Function Documentation

void log4cpp::Category::_logUnconditionally (Priority::Value priority, const char * format, va_list arguments) [protected], [virtual]

void log4cpp::Category::_logUnconditionally2 (Priority::Value priority, const std::string & message) [protected], [virtual]

Unconditionally log a message with the specified priority.

Parameters

priority The priority of this log message.
message string to write in the log file

Reimplemented in log4cpp::FixedContextCategory.

void log4cpp::Category::addAppender (Appender & appender) [virtual]

Adds an Appender for this Category. This method does not pass ownership from the caller to the Category.

Since

0.2.7

Parameters

appender The Appender this category has to log to.

Reimplemented in log4cpp::FixedContextCategory.

void log4cpp::Category::addAppender (Appender * appender) [virtual]

Adds an Appender to this Category. This method passes ownership from the caller to the Category.

Since

0.2.7

Parameters

appender The Appender to wich this category has to log.

Exceptions

std::invalid_argument if the appender is NULL.

Reimplemented in log4cpp::FixedContextCategory.

void log4cpp::Category::alert (const char * stringFormat, ...)

Log a message with alert priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::alert (const std::string & message)

Log a message with alert priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::alertStream () [inline]

Return a CategoryStream with priority ALERT.

Returns

The CategoryStream.

void log4cpp::Category::callAppenders (const LoggingEvent & event) [virtual]

Call the appenders in the hierarchy starting at this. If no appenders could be found, emit a warning.

This method always calls all the appenders inherited form the hierracy circumventing any evaluation of whether to log or not to log the particular log request.

Parameters

event the LogginEvent to log.

Reimplemented in log4cpp::FixedContextCategory.

void log4cpp::Category::crit (const char * stringFormat, ...)

Log a message with crit priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::crit (const std::string & message)

Log a message with crit priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::critStream () [inline]

Return a CategoryStream with priority CRIT.

Returns

The CategoryStream.

void log4cpp::Category::debug (const char * stringFormat, ...)

Log a message with debug priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::debug (const std::string & message)

Log a message with debug priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::debugStream () [inline]

Return a CategoryStream with priority DEBUG.

Returns

The CategoryStream.

void log4cpp::Category::emerg (const char * stringFormat, ...)

Log a message with emerg priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::emerg (const std::string & message)

Log a message with emerg priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::emergStream () [inline]

Return a CategoryStream with priority EMERG.

Returns

The CategoryStream.

void log4cpp::Category::error (const char * stringFormat, ...)

Log a message with error priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::error (const std::string & message)

Log a message with error priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::errorStream () [inline]

Return a CategoryStream with priority ERROR.

Returns

The CategoryStream.

Category * log4cpp::Category::exists (const std::string & name) [static]

If the named category exists (in the default hierarchy) then it returns a reference to the category, otherwise it returns NULL.

Since

0.2.7

void log4cpp::Category::fatal (const char * stringFormat, ...)

Log a message with fatal priority. NB. priority 'fatal' is equivalent to 'emerg'.

Since

0.2.7

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::fatal (const std::string & message)

Log a message with fatal priority. NB. priority 'fatal' is equivalent to 'emerg'.

Since

0.2.7

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::fatalStream () [inline]

Return a CategoryStream with priority FATAL. NB. priority 'fatal' is equivalent to 'emerg'.

Since

0.2.7

Returns

The CategoryStream.

bool log4cpp::Category::getAdditivity () const [virtual]

Returns the additivity flag for this Category instance.

Reimplemented in log4cpp::FixedContextCategory.

AppenderSet log4cpp::Category::getAllAppenders () const [virtual]

Returns the set of Appenders currently attached to this Catogory.

Since

0.3.1

Returns

The set of attached Appenders.

Reimplemented in log4cpp::FixedContextCategory.

Appender * log4cpp::Category::getAppender () const [virtual]

Returns the first Appender for this Category, or NULL if no Appender has been set.

Deprecated

use getAppender(const std::string&)

Returns

The Appender.

Reimplemented in log4cpp::FixedContextCategory.

Appender * log4cpp::Category::getAppender (const std::string & name) const [virtual]

Returns the specified Appender for this Category, or NULL if the Appender is not attached to this Category.

Since

0.2.7

Returns

The Appender.

Reimplemented in log4cpp::FixedContextCategory.

Priority::Value log4cpp::Category::getChainedPriority () const [virtual]

Starting from this Category, search the category hierarchy for a set priority and return it. Otherwise, return the priority of the root category.

The Category class is designed so that this method executes as quickly as possible.

Reimplemented in log4cpp::FixedContextCategory.

std::vector< Category * > * log4cpp::Category::getCurrentCategories () [static]

Returns all the currently defined categories as a vector of Category pointers. Note: this function does not pass ownership of the categories in the vector to the caller, only the ownership of the vector. However vector<Category&>* is not legal C++, so we can't follow the default ownership conventions.

Unlike in log4j, the root category is included in the returned set.

Since

0.3.2. Before 0.3.2 this method returned a std::set

Category & log4cpp::Category::getInstance (const std::string & name) [static]

Instantiate a Category with name name. This method does not set priority of the category which is by default Priority::NOTSET.

Parameters

name The name of the category to retrieve.

const std::string & log4cpp::Category::getName () const [virtual]

Return the category name.

Returns

The category name.

const Category * log4cpp::Category::getParent () const [virtual]

Returns the parent category of this category, or NULL if the category is the root category.

Returns

the parent category.

Category * log4cpp::Category::getParent () [virtual]

Returns the parent category of this category, or NULL if the category is the root category.

Returns

the parent category.

Priority::Value log4cpp::Category::getPriority () const [virtual]

Returns the assigned Priority, if any, for this Category.

Returns

Priority - the assigned Priority, can be Priority::NOTSET

Reimplemented in log4cpp::FixedContextCategory.

Category & log4cpp::Category::getRoot () [static]

Return the root of the Category hierarchy. The root category is always instantiated and available. It's name is the empty string.

Unlike in log4j, calling Category.getInstance("") does retrieve the root category and not a category just under root named "".

Returns

The root category

Priority::Value log4cpp::Category::getRootPriority () [static]

Get the priority of the root Category.

Returns

the priority of the root category

CategoryStream log4cpp::Category::getStream (Priority::Value priority) [virtual]

Return a CategoryStream with given Priority.

Parameters

priority The Priority of the CategoryStream.

Returns

The requested CategoryStream.

void log4cpp::Category::info (const char * stringFormat, ...)

Log a message with info priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::info (const std::string & message)

Log a message with info priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::infoStream () [inline]

Return a CategoryStream with priority INFO.

Returns

The CategoryStream.

bool log4cpp::Category::isAlertEnabled () const [inline]

Return true if the Category will log messages with priority ALERT.

Returns

Whether the Category will log.

bool log4cpp::Category::isCritEnabled () const [inline]

Return true if the Category will log messages with priority CRIT.

Returns

Whether the Category will log.

bool log4cpp::Category::isDebugEnabled () const [inline]

Return true if the Category will log messages with priority DEBUG.

Returns

Whether the Category will log.

bool log4cpp::Category::isEmergEnabled () const [inline]

Return true if the Category will log messages with priority EMERG.

Returns

Whether the Category will log.

bool log4cpp::Category::isErrorEnabled () const [inline]

Return true if the Category will log messages with priority ERROR.

Returns

Whether the Category will log.

bool log4cpp::Category::isFatalEnabled () const [inline]

Return true if the Category will log messages with priority FATAL. NB. priority 'fatal' is equivalent to 'emerg'.

Since

0.2.7

Returns

Whether the Category will log.

bool log4cpp::Category::isInfoEnabled () const [inline]

Return true if the Category will log messages with priority INFO.

Returns

Whether the Category will log.

bool log4cpp::Category::isNoticeEnabled () const [inline]

Return true if the Category will log messages with priority NOTICE.

Returns

Whether the Category will log.

bool log4cpp::Category::isPriorityEnabled (Priority::Value priority) const [virtual]

Returns true if the chained priority of the Category is equal to or higher than given priority.

Parameters

priority The priority to compare with.

Returns

whether logging is enable for this priority.

bool log4cpp::Category::isWarnEnabled () const [inline]

Return true if the Category will log messages with priority WARN.

Returns

Whether the Category will log.

void log4cpp::Category::log (Priority::Value priority, const char * stringFormat, ...) [virtual]

Log a message with the specified priority.

Parameters

priority The priority of this log message.
stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::log (Priority::Value priority, const std::string & message) [virtual]

Log a message with the specified priority.

Parameters

priority The priority of this log message.
message string to write in the log file

void log4cpp::Category::logva (Priority::Value priority, const char * stringFormat, va_list va) [virtual]

Log a message with the specified priority.

Since

0.2.7

Parameters

priority The priority of this log message.
stringFormat Format specifier for the string to write in the log file.
va The arguments for stringFormat.

void log4cpp::Category::notice (const char * stringFormat, ...)

Log a message with notice priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::notice (const std::string & message)

Log a message with notice priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::noticeStream () [inline]

Return a CategoryStream with priority NOTICE.

Returns

The CategoryStream.

CategoryStream log4cpp::Category::operator<< (Priority::Value priority) [virtual]

Return a CategoryStream with given Priority.

Parameters

priority The Priority of the CategoryStream.

Returns

The requested CategoryStream.

virtual bool log4cpp::Category::ownsAppender () const [inline], [virtual]

Returns true if the Category owns the first Appender in its Appender set. In that case the Category destructor will delete the Appender.

Deprecated

use ownsAppender(Appender*)

Reimplemented in log4cpp::FixedContextCategory.

bool log4cpp::Category::ownsAppender (Appender * appender) const [virtual]

Returns true if the Category owns the Appender. In that case the Category destructor will delete the Appender.

Since

0.2.7

Reimplemented in log4cpp::FixedContextCategory.

void log4cpp::Category::removeAllAppenders () [virtual]

Removes all appenders for this Category.

Reimplemented in log4cpp::FixedContextCategory.

void log4cpp::Category::removeAppender (Appender * appender) [virtual]

Removes specified appender for this Category.

Since

0.2.7

void log4cpp::Category::setAdditivity (bool additivity) [virtual]

Set the additivity flag for this Category instance.

Reimplemented in log4cpp::FixedContextCategory.

void log4cpp::Category::setAppender (Appender & appender) [inline]

Adds an Appender for this Category. This method does not pass ownership from the caller to the Category.

Deprecated

use addAppender(Appender&) instead.

Parameters

appender The Appender this category has to log to.

void log4cpp::Category::setAppender (Appender * appender) [inline]

Adds an Appender to this Category. This method passes ownership from the caller to the Category.

Deprecated

use addAppender(Appender*) or removeAllAppenders() instead.

Parameters

appender The Appender this category has to log to or NULL to remove the current Appenders.

void log4cpp::Category::setPriority (Priority::Value priority) [virtual]

Set the priority of this Category.

Parameters

priority The priority to set. Use Priority::NOTSET to let the category use its parents priority as effective priority.

Exceptions

std::invalid_argument if the caller tries to set Priority::NOTSET on the Root Category.

void log4cpp::Category::setRootPriority (Priority::Value priority) [static]

Set the priority of the root Category.

Parameters

priority The new priority for the root Category

void log4cpp::Category::shutdown () [static]

This method will remove all Appenders from Categories.XXX.

void log4cpp::Category::shutdownForced () [static]

This method will remove all Appenders from Categories.XXX and delete all appenders. Releases more memory than shutdown() by deleting appenders.

void log4cpp::Category::warn (const char * stringFormat, ...)

Log a message with warn priority.

Parameters

stringFormat Format specifier for the string to write in the log file.
... The arguments for stringFormat

void log4cpp::Category::warn (const std::string & message)

Log a message with warn priority.

Parameters

message string to write in the log file

CategoryStream log4cpp::Category::warnStream () [inline]

Return a CategoryStream with priority WARN.

Returns

The CategoryStream.

Friends And Related Symbol Documentation

friend class HierarchyMaintainer [friend]

Author

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