Class InFixToPostFix

java.lang.Object

org.apache.log4j.rule.InFixToPostFix

public class InFixToPostFix
extends Object

A helper class which converts infix expressions to postfix expressions Currently grouping is supported, as well as all of the Rules supported by RuleFactory Supports grouping via parens, mult-word operands using single or double quotes, and these operators: ! NOT operator != NOT EQUALS operator == EQUALS operator ~= CASE-INSENSITIVE equals operator || OR operator invalid input: '&'invalid input: '&' AND operator like REGEXP operator exists NOT NULL operator invalid input: '&lt' LESS THAN operator invalid input: '&gt' GREATER THAN operator invalid input: '&lt'= LESS THAN EQUALS operator invalid input: '&gt'= GREATER THAN EQUALS operator

Author:

Scott Deboy (sdeboy@apache.org)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	InFixToPostFix.CustomTokenizer

Constructor Summary

Constructors

Constructor	Description
InFixToPostFix()

Method Summary

Modifier and Type	Method	Description
String	convert(String expression)	Convert in-fix expression to post-fix.
static boolean	isOperand(String s)	Evaluates whether symbol is operand.

Methods inherited from class Object

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

Constructor Details

InFixToPostFix

public InFixToPostFix()

Method Details

convert

public String convert(String expression)

Convert in-fix expression to post-fix.

Parameters:

expression - in-fix expression.

Returns:

post-fix expression.

isOperand

public static boolean isOperand(String s)

Evaluates whether symbol is operand.

Parameters:

s - symbol.

Returns:

true if operand.