/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces.component.util;
import java.io.Serializable;
import javax.faces.component.PartialStateHolder;
import javax.faces.component.StateHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;
/**
* @author Nick Belaevski
*
*/
public final class PartialStateHolderUtil {
private static final class StateHolderObject implements Serializable {
private static final long serialVersionUID = 6157742187482213801L;
private boolean partialState;
private Object savedState;
public StateHolderObject(boolean partialState, Object savedState) {
super();
this.partialState = partialState;
this.savedState = savedState;
}
public boolean isPartialState() {
return partialState;
}
public Object getSavedState() {
return savedState;
}
}
private PartialStateHolderUtil() {
// utility class constructor
}
public static Object saveState(FacesContext context, UIComponent component, Object objectToSave) {
Object savedState = null;
boolean nullDelta = true;
boolean converterHasPartialState = false;
if (component.initialStateMarked()) {
if (objectToSave != null) {
if (objectToSave instanceof PartialStateHolder) {
// Delta
StateHolder holder = (StateHolder) objectToSave;
if (!holder.isTransient()) {
Object attachedState = holder.saveState(context);
if (attachedState != null) {
nullDelta = false;
savedState = attachedState;
}
converterHasPartialState = true;
} else {
savedState = null;
}
} else {
// Full
savedState = UIComponentBase.saveAttachedState(context, objectToSave);
nullDelta = false;
}
}
if (savedState == null && nullDelta) {
// No values
return null;
}
} else {
savedState = UIComponentBase.saveAttachedState(context, objectToSave);
}
return new StateHolderObject(converterHasPartialState, savedState);
}
public static Object restoreState(FacesContext context, Object savedState, Object existingObject) {
if (savedState != null) {
StateHolderObject stateHolderObject = (StateHolderObject) savedState;
if (stateHolderObject.isPartialState()) {
((StateHolder) existingObject).restoreState(context, stateHolderObject.getSavedState());
return existingObject;
} else {
return UIComponentBase.restoreAttachedState(context, stateHolderObject.getSavedState());
}
} else {
return null;
}
}
}