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java.lang.Objectorg.apache.log4j.rule.AbstractRule
org.apache.log4j.rule.ExpressionRule
public class ExpressionRule
A Rule class supporting both infix and postfix expressions,
accepting any rule which
is supported by the RuleFactory
.
NOTE: parsing is supported through the use of
StringTokenizer
, which
implies two limitations:
1: all tokens in the expression must be separated by spaces,
including parenthesis
2: operands which contain spaces MUST be wrapped in single quotes.
For example, the expression:
msg == 'some msg'
is a valid expression.
3: To group expressions, use parentheses.
For example, the expression:
level >= INFO || ( msg == 'some msg' || logger == 'test' )
is a valid expression.
See org.apache.log4j.rule.InFixToPostFix for a
description of supported operators.
See org.apache.log4j.spi.LoggingEventFieldResolver for field keywords.
Method Summary | |
---|---|
boolean |
evaluate(org.apache.log4j.spi.LoggingEvent event)
Returns true if this implementation of the rule accepts the LoggingEvent, or false if not. |
static Rule |
getRule(java.lang.String expression)
Get rule. |
static Rule |
getRule(java.lang.String expression,
boolean isPostFix)
Get rule. |
java.lang.String |
toString()
|
Methods inherited from class org.apache.log4j.rule.AbstractRule |
---|
addPropertyChangeListener, firePropertyChange, firePropertyChange, removePropertyChangeListener |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Method Detail |
---|
public static Rule getRule(java.lang.String expression)
expression
- expression.
public static Rule getRule(java.lang.String expression, boolean isPostFix)
expression
- expression.isPostFix
- If post-fix.
public boolean evaluate(org.apache.log4j.spi.LoggingEvent event)
What True/False means can be client-specific.
event
- LoggingEvent this instance will evaluate
public java.lang.String toString()
toString
in class java.lang.Object
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