org.apache.commons.jexl
Interface JexlExprResolver

All Known Implementing Classes:

FlatResolver

public interface JexlExprResolver

A Resolver allows custom resolution of the expression, and can be added in front of the jexl engine, or after in the evaluation.

Since:

1.0

Version:

$Id: JexlExprResolver.java 397092 2006-04-26 05:11:28Z dion $

Field Summary

static Object

NO_VALUE represents an expression result of no value.

Method Summary

Object

evaluate(JexlContext context, String expression) Evaluates an expression against the context.

Field Detail

NO_VALUE

public static final Object NO_VALUE

represents an expression result of no value.

Method Detail

evaluate

public Object evaluate(JexlContext context,
                       String expression)

Evaluates an expression against the context.

Parameters:

context - current data context

expression - expression to evauluate

Returns:

value (may be null) or the NO_VALUE object to indicate no resolution.