org.apache.log4j.rule

Class RuleFactory

java.lang.Object

org.apache.log4j.rule.RuleFactory

public final class RuleFactory
extends java.lang.Object

A Factory class which, given a string representation of the rule, and a context stack, will return a Rule ready for evaluation against events. If an operator is requested that isn't supported, an IllegalArgumentException is thrown.

Author:

Scott Deboy (sdeboy@apache.org)

Method Summary

Modifier and Type	Method and Description
static RuleFactory	getInstance() Get instance.
Rule	getRule(java.lang.String symbol, java.util.Stack stack) Create rule from applying operator to stack.
boolean	isRule(java.lang.String symbol) Determine if specified string is a known operator.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static RuleFactory getInstance()

Get instance.

Returns:

rule factory instance.

isRule

public boolean isRule(java.lang.String symbol)

Determine if specified string is a known operator.

Parameters:

symbol - string

Returns:

true if string is a known operator

getRule

public Rule getRule(java.lang.String symbol,
                    java.util.Stack stack)

Create rule from applying operator to stack.

Parameters:

symbol - symbol

stack - stack

Returns:

new instance