com.infoviz.util
Interface Evaluator

public interface Evaluator

An interface for Evaluation of an Expressions.

$Id$ $Revision$ $Author$

Method Summary

java.lang.Object

evaluate(java.lang.Object leftOperand, java.lang.String operator, java.lang.Object rightOperand) evaluate an expression.

Method Detail

evaluate

public java.lang.Object evaluate(java.lang.Object leftOperand,
                                 java.lang.String operator,
                                 java.lang.Object rightOperand)
                          throws EvaluationException

evaluate an expression.

Parameters:

leftOperand - the left operand

operator - the operator. logical operators: and, or, not. relational operators: >, <, >=. <= and =.

rightOperand -

Returns:

an Object containing the result, implementors should provide the details of the object

Throws:

EvaluationException - if there is a problem during the evaluation of the expression