javax.faces.component.UIOutput Maven / Gradle / Ivy
/*
* $Id: UIOutput.java,v 1.54.12.1 2008/04/21 20:31:24 edburns Exp $
*/
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package javax.faces.component;
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";
enum PropertyKeys {
value,
converter
}
private Converter converter;
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UIOutput} instance with default property
* values.
*/
public UIOutput() {
super();
setRendererType("javax.faces.Text");
}
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
// --------------------------------------- EditableValueHolder Properties
public Converter getConverter() {
if (this.converter != null) {
return (this.converter);
}
return (Converter) getStateHelper().eval(PropertyKeys.converter);
}
public void setConverter(Converter converter) {
clearInitialState();
// we don't push the converter to the StateHelper
// if it's been explicitly set (i.e. it's not a ValueExpression
// reference
this.converter = converter;
}
public Object getLocalValue() {
return getStateHelper().get(PropertyKeys.value);
}
public Object getValue() {
return getStateHelper().eval(PropertyKeys.value);
}
public void setValue(Object value) {
getStateHelper().put(PropertyKeys.value, value);
}
/**
*
* In addition to the actions taken in {@link UIComponentBase}
* when {@link PartialStateHolder#markInitialState()} is called,
* check if the installed {@link Converter} is a PartialStateHolder and
* if it is, call {@link javax.faces.component.PartialStateHolder#markInitialState()}
* on it.
*
*/
@Override
public void markInitialState() {
super.markInitialState();
Converter c = getConverter();
if (c != null && c instanceof PartialStateHolder) {
((PartialStateHolder) c).markInitialState();
}
}
@Override
public void clearInitialState() {
if (initialStateMarked()) {
super.clearInitialState();
Converter c = getConverter();
if (c != null && c instanceof PartialStateHolder) {
((PartialStateHolder) c).clearInitialState();
}
}
}
@Override
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
Object[] values = (Object[]) super.saveState(context);
Object converterState = null;
if (converter != null) {
if (!initialStateMarked()) {
// we saving the full state
converterState = saveAttachedState(context, converter);
} else {
if (converter instanceof StateHolder) {
StateHolder sh = (StateHolder) converter;
if (!sh.isTransient()) {
converterState = ((StateHolder) converter).saveState(context);
}
}
}
}
if (converterState != null || values != null) {
return new Object[] { values, converterState };
}
return values;
}
@Override
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state == null) {
return;
}
Object[] values = (Object[]) state;
super.restoreState(context, values[0]);
Object converterState = values[1];
if (converterState instanceof StateHolderSaver) {
// this means full state was saved and as such
// overwrite any existing converter with the saved
// converter
converter = (Converter) restoreAttachedState(context,
converterState);
} else {
// apply any saved state to the existing converter
if (converterState != null && converter instanceof StateHolder) {
((StateHolder) converter)
.restoreState(context, converterState);
}
}
}
}