org.apache.taglibs.standard.lang.support
Class ExpressionEvaluatorManager

java.lang.Object
  org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager

public class ExpressionEvaluatorManager
extends Object

A conduit to the JSTL EL. Based on...

An implementation of the ExpressionEvaluatorManager called for by the JSTL rev1 draft. This class is responsible for delegating a request for expression evaluating to the particular, "active" ExpressionEvaluator for the given point in the PageContext object passed in.

Author:

Shawn Bayern

Field Summary

static String

EVALUATOR_CLASS

Constructor Summary

ExpressionEvaluatorManager()

Method Summary

static Object	coerce(Object value, Class classe) Performs a type conversion according to the EL's rules.
static Object	evaluate(String attributeName, String expression, Class expectedType, javax.servlet.jsp.PageContext pageContext) Invokes the evaluate() method on the "active" ExpressionEvaluator for the given pageContext.
static Object	evaluate(String attributeName, String expression, Class expectedType, javax.servlet.jsp.tagext.Tag tag, javax.servlet.jsp.PageContext pageContext) Invokes the evaluate() method on the "active" ExpressionEvaluator for the given pageContext.
static ExpressionEvaluator	getEvaluatorByName(String name) Gets an ExpressionEvaluator from the cache, or seeds the cache if we haven't seen a particular ExpressionEvaluator before.

Methods inherited from class java.lang.Object

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

Field Detail

EVALUATOR_CLASS

public static final String EVALUATOR_CLASS

See Also:

Constant Field Values

Constructor Detail

ExpressionEvaluatorManager

public ExpressionEvaluatorManager()

Method Detail

evaluate

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

Invokes the evaluate() method on the "active" ExpressionEvaluator for the given pageContext.

Throws:

javax.servlet.jsp.JspException

evaluate

public static Object evaluate(String attributeName,
                              String expression,
                              Class expectedType,
                              javax.servlet.jsp.PageContext pageContext)
                       throws javax.servlet.jsp.JspException

Invokes the evaluate() method on the "active" ExpressionEvaluator for the given pageContext.

Throws:

javax.servlet.jsp.JspException

getEvaluatorByName

public static ExpressionEvaluator getEvaluatorByName(String name)
                                              throws javax.servlet.jsp.JspException

Gets an ExpressionEvaluator from the cache, or seeds the cache if we haven't seen a particular ExpressionEvaluator before.

Throws:

javax.servlet.jsp.JspException

coerce

public static Object coerce(Object value,
                            Class classe)
                     throws javax.servlet.jsp.JspException

Performs a type conversion according to the EL's rules.

Throws:

javax.servlet.jsp.JspException