/* Evaluator.java
Purpose:
Description:
History:
Thu Aug 30 15:43:48 2007, Created by tomyeh
Copyright (C) 2007 Potix Corporation. All Rights Reserved.
{{IS_RIGHT
This program is distributed under LGPL Version 3.0 in the hope that
it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.zk.xel;
import org.zkoss.xel.Expression;
import org.zkoss.xel.XelException;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.Component;
/**
* A ZK specific expression builder that is based on XEL.
*
* @author tomyeh
* @since 3.0.0
*/
public interface Evaluator extends java.io.Serializable {
/**
* Prepares the expression.
*
* @param expression the expression to be prepared for being evaluated
* later.
* @param expectedType the expected type of the result of the evaluation
*/
public Expression parseExpression(String expression, Class expectedType)
throws XelException;
/**
* Evaluates the expression.
*
* @param page the page, or null to ignore
*/
public Object evaluate(Page page, Expression expression)
throws XelException;
/**
* Evaluates the expression.
*
* @param comp the component, or null to ignore
*/
public Object evaluate(Component comp, Expression expression)
throws XelException;
}
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