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JSR-000372: JavaServer(TM) Faces 2.3 API
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
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";
private static final String FORCE_FULL_CONVERTER_STATE = "com.sun.faces.component.UIOutput.forceFullConverterState";
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
@Override
public String getFamily() {
return COMPONENT_FAMILY;
}
// --------------------------------------- EditableValueHolder Properties
@Override
public Converter getConverter() {
if (converter != null) {
return converter;
}
return (Converter) getStateHelper().eval(PropertyKeys.converter);
}
@Override
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;
}
@Override
public Object getLocalValue() {
return getStateHelper().get(PropertyKeys.value);
}
/**
*
* Return the value property.
*
*
* @since 2.2
*/
@Override
public Object getValue() {
return getStateHelper().eval(PropertyKeys.value);
}
@Override
public void setValue(Object value) {
getStateHelper().put(PropertyKeys.value, value);
}
/**
*
* Convenience method to reset this component's value to the un-initialized state.
*
*
* @since 2.2
*/
public void resetValue() {
getStateHelper().remove(PropertyKeys.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 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 converterState = null;
if (converter != null) {
if (!initialStateMarked() || getAttributes().containsKey(FORCE_FULL_CONVERTER_STATE)) {
/*
* Check if our parent component has its initial state marked and we know we don't.
* That means we are not using the same state saving algorithm. So we are going to
* ALWAYS force to do FSS for the converter.
*/
if (getParent() != null && getParent().initialStateMarked()) {
getAttributes().put(FORCE_FULL_CONVERTER_STATE, true);
if (converter instanceof PartialStateHolder) {
PartialStateHolder partialStateHolder = (PartialStateHolder) converter;
partialStateHolder.clearInitialState();
}
}
converterState = saveAttachedState(context, converter);
} else {
if (converter instanceof StateHolder) {
StateHolder stateHolder = (StateHolder) converter;
if (!stateHolder.isTransient()) {
converterState = ((StateHolder) converter).saveState(context);
}
}
}
}
Object[] values = (Object[]) super.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);
}
}
}
}