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

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