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JSR-000344: JavaServer(TM) Faces 2.2 API
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package javax.faces.component;
import javax.faces.context.FacesContext;
import java.util.List;
import java.util.ArrayList;
import java.lang.reflect.Array;
import java.util.Iterator;
/**
*
* Utility class to enable partial state saving of Lists of attached objects
* such as FacesListeners or Validators.
*
*/
@SuppressWarnings({"unchecked"})
class AttachedObjectListHolder implements PartialStateHolder {
private boolean initialState;
private List attachedObjects = new ArrayList(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(2);
}
for (int i = 0, len = attachedObjects.length; i < len; i++) {
T restored = (T) ((StateHolderSaver) attachedObjects[i]).restore(context);
if (restored != null) {
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 type) {
return new ArrayList(attachedObjects).toArray((T[])Array.newInstance(type, attachedObjects.size()));
}
Iterator iterator() {
return attachedObjects.iterator();
}
}