org.apache.taglibs.standard.tag.el.core

Class ExpressionUtil

java.lang.Object

org.apache.taglibs.standard.tag.el.core.ExpressionUtil

public class ExpressionUtil
extends java.lang.Object

Contains some static utilities to facilitate common forms of expression evaluation.

Author:

Shawn Bayern

Constructor Summary

Constructors

Constructor and Description
ExpressionUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static java.lang.Object	evalNotNull(java.lang.String tagName, java.lang.String attributeName, java.lang.String expression, java.lang.Class expectedType, javax.servlet.jsp.tagext.Tag tag, javax.servlet.jsp.PageContext pageContext) Evaluates an expression if present, but does not allow the expression to evaluate to 'null', throwing a NullAttributeException if it does.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionUtil

public ExpressionUtil()

Method Detail

evalNotNull

public static java.lang.Object evalNotNull(java.lang.String tagName,
                           java.lang.String attributeName,
                           java.lang.String expression,
                           java.lang.Class expectedType,
                           javax.servlet.jsp.tagext.Tag tag,
                           javax.servlet.jsp.PageContext pageContext)
                                    throws javax.servlet.jsp.JspException

Evaluates an expression if present, but does not allow the expression to evaluate to 'null', throwing a NullAttributeException if it does. The function can return null, however, if the expression itself is null.

Throws:

javax.servlet.jsp.JspException