org.richfaces.el.util

Class ELUtils

java.lang.Object

org.richfaces.el.util.ELUtils

public final class ELUtils
extends Object

Author:

asmirnov

Method Summary

Modifier and Type	Method and Description
static <T> T	coerce(Object value, Class<T> targetType) Coerce the given object to targetType.
static javax.el.ValueExpression	createValueExpression(javax.faces.context.FacesContext context, String expression, boolean literal, Class<?> expectedType) Creates value expression from string and stores expression's expected type.
static javax.el.ValueExpression	createValueExpression(String expression) Create a ValueExpression with the expected type of Object.class
static javax.el.ValueExpression	createValueExpression(String expression, Class<?> expectedType) Creates value expression from string and stores expression's expected type
static Object	evaluateValueExpression(javax.el.ValueExpression expression, javax.el.ELContext elContext)
static boolean	isValueReference(String value) Get EL-enabled value.

Methods inherited from class java.lang.Object

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

Method Detail

isValueReference

public static boolean isValueReference(String value)

Get EL-enabled value. Return same string, if not el-expression. Otherthise, return parsed and evaluated expression.

Parameters:

value - string to parse

Returns:

interpreted el or unmodified value

createValueExpression

public static javax.el.ValueExpression createValueExpression(String expression)

Create a ValueExpression with the expected type of Object.class

Parameters:

expression - an EL expression

Returns:

a new ValueExpression instance based off the provided valueRef

createValueExpression

public static javax.el.ValueExpression createValueExpression(String expression,
                                                             Class<?> expectedType)

Creates value expression from string and stores expression's expected type

Parameters:

expression - string with EL expressions

expectedType - the type expected from expression after evaluation

Returns:

value expression from string and stores expression's expected type

evaluateValueExpression

public static Object evaluateValueExpression(javax.el.ValueExpression expression,
                                             javax.el.ELContext elContext)

createValueExpression

public static javax.el.ValueExpression createValueExpression(javax.faces.context.FacesContext context,
                                                             String expression,
                                                             boolean literal,
                                                             Class<?> expectedType)

Creates value expression from string and stores expression's expected type.

If the literal is provided, constant value expression is used instead.

Parameters:

context - current FacesContext

expression - string with EL expressions

literal - determined if the literal value is required

expectedType - the type expected from expression after evaluation

Returns:

value expression from string and stores expression's expected type

coerce

public static <T> T coerce(Object value,
                           Class<T> targetType)

Coerce the given object to targetType.

Parameters:

value - object to be coerced

targetType - which should be object coerced into

Returns:

the given value coerced to targetType