See org.apache.log4j.chainsaw.LoggingEventFieldResolver.java for the correct names for logging event fields used when building expressions.
See org.apache.log4j.chainsaw.rule package for a list of available rules which can be applied using the expression syntax.
See org.apache.log4j.chainsaw.RuleFactory for the symbols used to activate the corresponding rules.
NOTE: Grouping using parentheses is supported - all tokens must be separated by spaces, and operands which contain spaces are not yet supported.
Example:
In order to build a filter that displays all messages with infomsg-45 or infomsg-44 in the message, as well as all messages with a level of WARN or higher, build an expression using the LikeRule (supports ORO-based regular expressions) and the InequalityRule. ( MSG LIKE infomsg-4[4,5] ) && ( LEVEL >= WARN )
Three options are required: Expression - the expression to match ConvertInFixToPostFix - convert from infix to posfix (default true) AcceptOnMatch - true or false (default true)
Meaning of AcceptToMatch: If there is a match between the value of the Expression option and the log4cxx::spi::LoggingEvent and AcceptOnMatch is true, the decide method returns log4cxx::spi::Filter#ACCEPT.
If there is a match between the value of the Expression option and the log4cxx::spi::LoggingEvent and AcceptOnMatch is false, log4cxx::spi::Filter#DENY is returned.
If there is no match, log4cxx::spi::Filter#NEUTRAL is returned.
Public Member Functions | |
| ExpressionFilter () | |
| void | activateOptions (log4cxx::helpers::Pool &p) |
| Usually filters options become active when set. | |
| void | setExpression (const LogString &expression) |
| LogString | getExpression () const |
| void | setConvertInFixToPostFix (bool convertInFixToPostFix) |
| bool | getConvertInFixToPostFix () const |
| void | setAcceptOnMatch (bool acceptOnMatch) |
| bool | getAcceptOnMatch () const |
| FilterDecision | decide (const spi::LoggingEventPtr &event) const |
| Returns log4cxx::spi::Filter#NEUTRAL is there is no string match. | |
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Usually filters options become active when set. We provide a default do-nothing implementation for convenience. Reimplemented from Filter. |
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Returns log4cxx::spi::Filter#NEUTRAL is there is no string match.
Implements Filter. |
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