org.zkoss.xel.el

Class ELFactory

java.lang.Object

org.zkoss.xel.el.ELFactory

All Implemented Interfaces:

ExpressionFactory

public class ELFactory
extends Object
implements ExpressionFactory

An implementation based on ZK Commons EL (zcommons-el.jar: org.zkforge.apache.commons.el.ExpressionEvaluatorImpl). ZK commons-EL is a performance enhancement version of Apache Commons EL. It is also independent of JSP 2.0.

Since:

3.0.0

Author:

tomyeh

Field Summary

Fields inherited from interface org.zkoss.xel.ExpressionFactory

FEATURE_CLASS, FEATURE_FUNCTION

Constructor Summary

Constructors

Constructor and Description
ELFactory()

Method Summary

Modifier and Type	Method and Description
Object	evaluate(XelContext xelc, String expression, Class expectedType) Evaluates an expression.
boolean	isSupported(int feature) Returns whether an feature is supported.
Expression	parseExpression(XelContext xelc, String expression, Class expectedType) Prepares (a.k.a., compiles) an expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

ELFactory

public ELFactory()

Method Detail

isSupported

public boolean isSupported(int feature)

Description copied from interface: ExpressionFactory

Returns whether an feature is supported.

Specified by:

isSupported in interface ExpressionFactory

Parameters:

feature - which feature to query. It can be a combination of ExpressionFactory.FEATURE_FUNCTION and ExpressionFactory.FEATURE_CLASS.

parseExpression

public Expression parseExpression(XelContext xelc,
                                  String expression,
                                  Class expectedType)
                           throws XelException

Description copied from interface: ExpressionFactory

Prepares (a.k.a., compiles) an expression.

Specified by:

parseExpression in interface ExpressionFactory

Parameters:

xelc - the context information to prepare the expression. It can be null, in which case no functions are supported for this invocation.

expression - the expression to be evaluated.

expectedType - the expected type of the result of the evaluation

Throws:

XelException

evaluate

public Object evaluate(XelContext xelc,
                       String expression,
                       Class expectedType)
                throws XelException

Description copied from interface: ExpressionFactory

Evaluates an expression.

Specified by:

evaluate in interface ExpressionFactory

Parameters:

xelc - the context information to evaluate an expression. It can be null, in which case no functions are supported for this invocation.

expression - the expression to be evaluated. Note: the expression is enclosed with ${ and }, regardless of what implementation is used.

expectedType - the expected type of the result of the evaluation

Throws:

XelException