Package org.apache.empire.jsf2.utils

Class ValueExpressionUnwrapper

java.lang.Object

org.apache.empire.jsf2.utils.ValueExpressionUnwrapper

public class ValueExpressionUnwrapper
extends Object

ValueExpressionUnwrapper

Author:

doebele This class is used to unwrap nested ValueExpressions This is useful for Faclet-Taglib-Tags, that forward attributes which may or may not be provided for the tag. IMPORTANT: The expression in the Facelet-Tag must use a '$' character instead of a '#' Here is an example for such a tag <ui:composition xmlns="http://www.w3.org/1999/xhtml" xmlns:e="http://java.sun.com/jsf/composite/empire"> <tr> <e:control column="#{column}" record="#{record}" value="${value}" </e:control> </tr> </ui:composition> In this example the "${value}" will be unwrapped from the TagEncodingHelper in order to dectect whether or not an expression has been provided.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ValueExpressionUnwrapper()

Method Summary

Modifier and Type	Method	Description
static ValueExpressionUnwrapper	getInstance()
static void	setInstance(ValueExpressionUnwrapper instance)
javax.el.ValueExpression	unwrap(javax.el.ValueExpression ve, String exprPrefix)

Methods inherited from class java.lang.Object

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

Constructor Details

ValueExpressionUnwrapper

protected ValueExpressionUnwrapper()

Method Details

getInstance

public static ValueExpressionUnwrapper getInstance()

setInstance

public static void setInstance(ValueExpressionUnwrapper instance)

unwrap

public javax.el.ValueExpression unwrap(javax.el.ValueExpression ve,
 String exprPrefix)