javax.faces.component.UIOutput Maven / Gradle / Ivy
/*
* $Id: UIOutput.java,v 1.54 2007/04/27 22:00:05 ofung Exp $
*/
/*
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*
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*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
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package javax.faces.component;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
/**
* UIOutput is a {@link UIComponent} that has a
* value, optionally retrieved from a model tier bean via a value
* expression, that is displayed to the user. The user cannot directly
* modify the rendered value; it is for display purposes only.
*
* During the Render Response phase of the request processing
* lifecycle, the current value of this component must be
* converted to a String (if it is not already), according to the following
* rules:
*
* - If the current value is not
null, and is not already
* a String, locate a {@link Converter} (if any) to use
* for the conversion, as follows:
*
* - If
getConverter() returns a non-null {@link Converter},
* use that one, otherwise
* - If
Application.createConverter(Class), passing the
* current value's class, returns a non-null {@link Converter},
* use that one.
*
* - If the current value is not
null and a {@link Converter}
* was located, call its getAsString() method to perform
* the conversion.
* - If the current value is not
null but no {@link Converter}
* was located, call toString() on the current value to perform
* the conversion.
*
*
* By default, the rendererType property must be set to
* "javax.faces.Text". This value can be changed by calling the
* setRendererType() method.
*/
public class UIOutput extends UIComponentBase
implements ValueHolder {
// ------------------------------------------------------ Manifest Constants
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.Output";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.Output";
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UIOutput} instance with default property
* values.
*/
public UIOutput() {
super();
setRendererType("javax.faces.Text");
}
// ------------------------------------------------------ Instance Variables
private Converter converter = null;
private Object value = null;
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
// --------------------------------------- ConvertibleValueHolder Properties
public Converter getConverter() {
if (this.converter != null) {
return (this.converter);
}
ValueExpression ve = getValueExpression("converter");
if (ve != null) {
try {
return ((Converter) ve.getValue(getFacesContext().getELContext()));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (null);
}
}
public void setConverter(Converter converter) {
this.converter = converter;
}
public Object getLocalValue() {
return (this.value);
}
public Object getValue() {
if (this.value != null) {
return (this.value);
}
ValueExpression ve = getValueExpression("value");
if (ve != null) {
try {
return (ve.getValue(getFacesContext().getELContext()));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (null);
}
}
public void setValue(Object value) {
this.value = value;
}
// ----------------------------------------------------- StateHolder Methods
private Object[] values;
public Object saveState(FacesContext context) {
if (values == null) {
values = new Object[3];
}
values[0] = super.saveState(context);
values[1] = saveAttachedState(context, converter);
values[2] = value;
return (values);
}
public void restoreState(FacesContext context, Object state) {
values = (Object[]) state;
super.restoreState(context, values[0]);
converter = (Converter) restoreAttachedState(context, values[1]);
value = values[2];
}
}