net.obvj.jep

Class ExpressionEvaluator

java.lang.Object

net.obvj.jep.ExpressionEvaluator

public class ExpressionEvaluator
extends Object

An object that validates an user expression at instantiation time and evaluates with given source variables at runtime.

Author:

oswaldo.bapvic.jr

Constructor Summary

Constructors

Constructor and Description
ExpressionEvaluator(String expression) Builds this extended expression evaluator

Method Summary

Modifier and Type	Method and Description
Object	evaluate(Map<String,Object> variables) Evaluates the instance-defined expression with a map of variables.
Object	evaluate(Map<String,Object> variables, boolean updateSourceMap) Evaluates the instance-defined expression with a map of variables.
static void	validateExpression(String expression) Validates the given expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionEvaluator

public ExpressionEvaluator(String expression)

Builds this extended expression evaluator

Parameters:

expression - the expression to be used for evaluation

Method Detail

validateExpression

public static void validateExpression(String expression)

Validates the given expression.

Parameters:

expression - the expression to be validated

evaluate

public Object evaluate(Map<String,Object> variables)
                throws org.nfunk.jep.ParseException

Evaluates the instance-defined expression with a map of variables.

Parameters:

variables - the map of variables to be used for the evaluation

Returns:

the expression evaluation result given the input variables

Throws:

org.nfunk.jep.ParseException - if for some reason the expression could not be evaluated

evaluate

public Object evaluate(Map<String,Object> variables,
                       boolean updateSourceMap)
                throws org.nfunk.jep.ParseException

Evaluates the instance-defined expression with a map of variables.

Parameters:

variables - the map of variables to be used for the evaluation

updateSourceMap - a flag indicating whether or not the initial variables map shall be updated with the evaluation results (default: false)

Returns:

the expression evaluation result given the input variables

Throws:

org.nfunk.jep.ParseException - if for some reason the expression could not be evaluated