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16 package org.apache.commons.jexl;
17
18 /***
19 * A Resolver allows custom resolution of the expression, and can be
20 * added in front of the jexl engine, or after in the evaluation.
21 *
22 * @todo This needs to be explained in detail. Why do this?
23 * @since 1.0
24 * @author <a href="mailto:geirm@adeptra.com">Geir Magnusson Jr.</a>
25 * @version $Id: JexlExprResolver.java 397092 2006-04-26 05:11:28Z dion $
26 */
27 public interface JexlExprResolver {
28 /*** represents an expression result of no value. */
29 Object NO_VALUE = new Object();
30
31 /***
32 * Evaluates an expression against the context.
33 *
34 * @todo Must detail the expectations and effects of this resolver.
35 * @param context current data context
36 * @param expression expression to evauluate
37 * @return value (may be null) or the NO_VALUE object to
38 * indicate no resolution.
39 */
40 Object evaluate(JexlContext context, String expression);
41 }