org.apache.myfaces.extensions.validator.core.el
Interface ELHelper

All Known Implementing Classes:

DefaultELHelper

public interface ELHelper

Encapulates EL handling to isolate the dependency to the specific jsf version.

Since:

1.x.1

Author:

Gerhard Petracek

Method Summary

Object	getBean(String beanName) Resolves the bean instance for the specified name.
Object	getBindingOfComponent(javax.faces.component.UIComponent uiComponent, String name) Deprecated.
PropertyDetails	getPropertyDetailsOfValueBinding(javax.faces.component.UIComponent uiComponent) Extracts the property details (expression, base object and property name) information of the value attribute of the given UIComponent value attribute.
Class	getTypeOfExpression(javax.faces.context.FacesContext facesContext, ValueBindingExpression valueBindingExpression) Evaluates the type returned by getValueOfExpression(javax.faces.context.FacesContext, org.apache.myfaces.extensions.validator.core.el.ValueBindingExpression)
Object	getValueOfExpression(javax.faces.context.FacesContext facesContext, ValueBindingExpression valueBindingExpression) Evaluates the given expression within the current FacesContext
boolean	isELTermValid(javax.faces.context.FacesContext facesContext, String valueBindingExpression) Determines if the expression is a valid expression, meaning that the expression can be evaluated without an exception.
boolean	isELTermWellFormed(Object o) A very basic check of the EL expression

Method Detail

getBean

Object getBean(String beanName)

Resolves the bean instance for the specified name.

Parameters:

beanName - The bean name we are interested in, no EL expression.

Returns:

instance for the bean name or null.

getValueOfExpression

Object getValueOfExpression(javax.faces.context.FacesContext facesContext,
                            ValueBindingExpression valueBindingExpression)

Evaluates the given expression within the current FacesContext

Parameters:

facesContext - FacesContext for the current request

valueBindingExpression - value-binding to evaluate

Returns:

result for the given expression

getTypeOfExpression

Class getTypeOfExpression(javax.faces.context.FacesContext facesContext,
                          ValueBindingExpression valueBindingExpression)

Evaluates the type returned by getValueOfExpression(javax.faces.context.FacesContext, org.apache.myfaces.extensions.validator.core.el.ValueBindingExpression)

Parameters:

facesContext - FacesContext for the current request

valueBindingExpression - value-binding to evaluate

Returns:

type of the result of the expression

getPropertyDetailsOfValueBinding

PropertyDetails getPropertyDetailsOfValueBinding(javax.faces.component.UIComponent uiComponent)

Extracts the property details (expression, base object and property name) information of the value attribute of the given UIComponent value attribute.

Parameters:

uiComponent - The UIComponent in question

Returns:

property details for the value of the given UIComponent

isELTermValid

boolean isELTermValid(javax.faces.context.FacesContext facesContext,
                      String valueBindingExpression)

Determines if the expression is a valid expression, meaning that the expression can be evaluated without an exception.

Parameters:

facesContext - The JSF Context

valueBindingExpression - The EL expression we want to evaluate.

Returns:

true if the expression is valid - false otherwise

isELTermWellFormed

boolean isELTermWellFormed(Object o)

A very basic check of the EL expression

Parameters:

o - Object in question

Returns:

true if the given object is a well formed string - false otherwise

getBindingOfComponent

@Deprecated
Object getBindingOfComponent(javax.faces.component.UIComponent uiComponent,
                                        String name)

Deprecated.

Gets the value of the attribute specified by the parameter name for the UIComponent.

Parameters:

uiComponent - The UIComponent in question

name - The name of the attribute.

Returns:

The ValueExpression assigned to the attribute.