Jsf Utility : JavaServer Faces « J2EE « Java
Jsf Utility
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/*
* @(#)JsfUtility.java
*
* Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved.
*
* END_HEADER - DO NOT EDIT
*/
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.faces.component.UIComponent;
public class JsfUtility {
protected JsfUtility() {
super();
}
/**
* Helper method to set value expression property.
*
* @param component The UIComponent to set a value expression for.
* @param name The name of the value expression property.
* @param expression The expresion for the value expression.
*/
public static void setValueExpression(UIComponent component, String name,
String expression) {
if (expression == null) {
return;
}
FacesContext context = FacesContext.getCurrentInstance();
component.setValueExpression(name, createValueExpression(
context, expression, Object.class));
}
/**
* Helper method to set a method expression property.
* Create a method expression that returns String and has no
* input paramaters.
*
* @param component The UIComponent to set a value binding for.
* @param name The name of the method expression property
* @param expression The expression to create.
*/
public static void setMethodExpression(UIComponent component,
String name, String expression) {
setMethodExpression(component, name, expression,
Object.class, new Class[0]);
}
/**
* Helper method to set a method expression property.
*
* @param component The UIComponent to set a value binding for.
* @param name The name of the method expression property
* @param expression The expression to create.
*/
public static void setMethodExpression(UIComponent component,
String name, String expression, Class out, Class[] in) {
if (expression == null) {
return;
}
FacesContext context = FacesContext.getCurrentInstance();
component.getAttributes().put(name,
createMethodExpression(context, expression, out, in));
}
public static MethodExpression createMethodExpression(
FacesContext context, String expr, Class out, Class[] in) {
return context.getApplication().getExpressionFactory().
createMethodExpression(context.getELContext(), expr, out, in);
}
public static ValueExpression createValueExpression(
FacesContext context, String expr, Class value) {
return context.getApplication().getExpressionFactory().
createValueExpression(context.getELContext(), expr, value);
}
}
