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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* 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 a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.component;
import javax.faces.context.FacesContext;
import java.util.List;
import java.util.ArrayList;
import java.lang.reflect.Array;
/**
* <p>
* Utility class to enable partial state saving of Lists of attached objects
* such as <code>FacesListener</code>s or <code>Validator</code>s.
* </p>
*/
@SuppressWarnings({"unchecked"})
class AttachedObjectListHolder<T> implements PartialStateHolder {
private boolean initialState;
private List<T> attachedObjects = new ArrayList<T>(2);
// ------------------------------------- Methods from PartialStateHolder
public void markInitialState() {
if (!attachedObjects.isEmpty()) {
for (T t : attachedObjects) {
if (t instanceof PartialStateHolder) {
((PartialStateHolder) t).markInitialState();
}
}
}
initialState = true;
}
public boolean initialStateMarked() {
return initialState;
}
public void clearInitialState() {
if (!attachedObjects.isEmpty()) {
for (T t : attachedObjects) {
if (t instanceof PartialStateHolder) {
((PartialStateHolder) t).clearInitialState();
}
}
}
initialState = false;
}
// -------------------------------------------- Methods from StateHolder
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (attachedObjects == null) {
return null;
}
if (initialState) {
Object[] attachedObjects = new Object[this.attachedObjects.size()];
boolean stateWritten = false;
for (int i = 0, len = attachedObjects.length; i < len; i++) {
T attachedObject = this.attachedObjects.get(i);
if (attachedObject instanceof StateHolder) {
StateHolder sh = (StateHolder) attachedObject;
if (!sh.isTransient()) {
attachedObjects[i] = sh.saveState(context);
}
if (attachedObjects[i] != null) {
stateWritten = true;
}
}
}
return ((stateWritten) ? attachedObjects : null);
} else {
Object[] attachedObjects = new Object[this.attachedObjects.size()];
for (int i = 0, len = attachedObjects.length; i < len; i++) {
attachedObjects[i] = UIComponentBase.saveAttachedState(context, this.attachedObjects.get(i));
}
return (attachedObjects);
}
}
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state == null) {
return;
}
Object[] attachedObjects = (Object[]) state;
if (attachedObjects.length > 0 && attachedObjects[0] instanceof StateHolderSaver) {
// overwrite the existing attachedObjects with those included
// in the full state.
if (this.attachedObjects != null) {
this.attachedObjects.clear();
} else {
this.attachedObjects = new ArrayList<T>(2);
}
for (int i = 0, len = attachedObjects.length; i < len; i++) {
T restored = (T) ((StateHolderSaver) attachedObjects[i]).restore(context);
if (restored != null) {
this.attachedObjects.add(restored);
}
}
} else {
// assume 1:1 relation between existing attachedObjects and state
for (int i = 0, len = attachedObjects.length; i < len; i++) {
T l = this.attachedObjects.get(i);
if (l instanceof StateHolder) {
((StateHolder) l).restoreState(context, attachedObjects[i]);
}
}
}
}
public boolean isTransient() {
return false;
}
public void setTransient(boolean newTransientValue) {
// no-op
}
// ------------------------------------------------------ Public Methods
void add(T attachedObject) {
clearInitialState();
attachedObjects.add(attachedObject);
}
void remove(T attachedObject) {
clearInitialState();
attachedObjects.remove(attachedObject);
}
T[] asArray(Class<T> type) {
return new ArrayList<T>(attachedObjects).toArray((T[])Array.newInstance(type, attachedObjects.size()));
}
}
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