org.zkoss.xel.util
Class Evaluators

java.lang.Object
  org.zkoss.xel.util.Evaluators

public class Evaluators
extends java.lang.Object

It mapps a name with an evaluator implementation.

Since:

3.0.0

Author:

tomyeh

Method Summary

static java.lang.String	add(Element config) Adds an evaluator based on the XML declaration.
static java.lang.String	add(java.lang.String name, java.lang.String evalcls) Adds an evaluator (aka., the expression factory, ExpressionFactory).
static boolean	exists(java.lang.String name) Tests whether the evaluator (aka., the expression factory) for the specified evaluator name exists.
static java.lang.Class	getEvaluatorClass(java.lang.String name) Returns the implementation for the specified evaluator name.

Methods inherited from class java.lang.Object

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

Method Detail

getEvaluatorClass

public static final java.lang.Class getEvaluatorClass(java.lang.String name)

Returns the implementation for the specified evaluator name.

Parameters:

name - the name of the evaluator, say, MVEL.

Throws:

SystemException - if not found or the class not found.

exists

public static final boolean exists(java.lang.String name)

Tests whether the evaluator (aka., the expression factory) for the specified evaluator name exists.

Parameters:

name - the name of the evaluator, say, MVEL.

add

public static final java.lang.String add(java.lang.String name,
                                         java.lang.String evalcls)

Adds an evaluator (aka., the expression factory, ExpressionFactory).

Parameters:

name - the name of the evaluator, say, MVEL. It is case insensitive.

evalcls - the class name of the evaluator, aka., the expression factory (ExpressionFactory).

Returns:

the previous class name, or null if not defined yet

add

public static final java.lang.String add(Element config)

Adds an evaluator based on the XML declaration. The evaluator is also known as the expression factory, ExpressionFactory.

<xel-config>
  <evaluator-name>SuperEL</evaluator-name><!-- case insensitive --!>
  <evaluator-class>my.MySuperEvaluator</evaluator-class>
</xel-config>
 

Parameters:

config - the XML element called zscript-config

Returns:

the previous class, or null if not defined yet