com.infoviz.util
Class Expression

java.lang.Object
  com.infoviz.util.Expression

public class Expression

extends java.lang.Object

Represents an expression. An expression consists of a left operand, right operand, and a operator the operands can be any object and the operators currently supported are:

logical: and, or, not

relational: =, >=, <=, !=

$Id$ $Revision$ $Author$

Constructor Summary

Expression(java.lang.String operator)

Method Summary

java.lang.Object	evaluate(Evaluator evaluator)
java.lang.Object	getLeftOperand()
java.lang.Object	getRightOperand()
static boolean	isLogicalOperator(java.lang.String operator)
static boolean	isRelationalOperator(java.lang.String operator)
static void	main(java.lang.String[] args)
static Expression	parse(java.lang.String input)
void	setLeftOperand(java.lang.Object leftOperand)
void	setRightOperand(java.lang.Object rightOperand)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Expression

public Expression(java.lang.String operator)

Method Detail

isRelationalOperator

public static boolean isRelationalOperator(java.lang.String operator)

isLogicalOperator

public static boolean isLogicalOperator(java.lang.String operator)

evaluate

public java.lang.Object evaluate(Evaluator evaluator)
                          throws EvaluationException

Throws:

EvaluationException

toString

public java.lang.String toString()

parse

public static Expression parse(java.lang.String input)

getLeftOperand

public java.lang.Object getLeftOperand()

setLeftOperand

public void setLeftOperand(java.lang.Object leftOperand)

getRightOperand

public java.lang.Object getRightOperand()

setRightOperand

public void setRightOperand(java.lang.Object rightOperand)

main

public static void main(java.lang.String[] args)