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/*
* Copyright (c) 2014 CEA and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Christian W. Damus (CEA) - Initial API and implementation
*
*/
package org.eclipse.papyrus.infra.tools.databinding;
import java.util.Collections;
import java.util.Set;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.set.IObservableSet;
import org.eclipse.core.databinding.observable.set.ISetChangeListener;
import org.eclipse.core.databinding.observable.set.SetChangeEvent;
import org.eclipse.core.databinding.observable.set.SetDiff;
/**
* This is the DelegatingObservableSet type. Enjoy.
*/
public class DelegatingObservableSet extends DelegatingObservableCollection<IObservableSet> implements IObservableSet {
private static final Object SET_EVENT_TYPE = new Object();
private ISetChangeListener forwardingSetChangeListener;
DelegatingObservableSet(IObservableSet delegate) {
super(delegate, IObservableSet.class);
}
DelegatingObservableSet(Realm realm) {
super(realm, IObservableSet.class);
}
public static IObservableSet wrap(IObservableSet observable) {
IObservableSet result;
if(observable instanceof IDelegatingObservable) {
// Already have a delegator. Just create another like it
try {
result = (IObservableSet)observable.getClass().getDeclaredConstructor(IObservableSet.class).newInstance(observable);
} catch (Exception e) {
// Seems unlikely as I must have created the observable in the first place
throw new IllegalArgumentException("observable is an invalid implementation of IDelegatingObservable", e); //$NON-NLS-1$
}
} else {
result = DelegatingInvocationHandler.wrap(new DelegatingObservableSet(observable), IObservableSet.class);
}
return result;
}
public static IObservableSet create(Realm realm, ClassLoader loader, Class<?>... mixins) {
return DelegatingInvocationHandler.wrap(new DelegatingObservableSet(realm), IObservableSet.class, loader, mixins);
}
public void addSetChangeListener(ISetChangeListener listener) {
addListener(SET_EVENT_TYPE, listener);
}
public void removeSetChangeListener(ISetChangeListener listener) {
removeListener(SET_EVENT_TYPE, listener);
}
@Override
protected void hookDelegate(IObservableSet delegate) {
super.hookDelegate(delegate);
delegate.addSetChangeListener(getForwardingSetChangeListener());
}
@Override
protected void unhookDelegate(IObservableSet delegate) {
delegate.removeSetChangeListener(getForwardingSetChangeListener());
super.unhookDelegate(delegate);
}
@Override
protected void delegateChanged(IObservableSet oldDelegate, IObservableSet newDelegate) {
super.delegateChanged(oldDelegate, newDelegate);
Set<?> oldSet = ((oldDelegate == null) || oldDelegate.isDisposed()) ? Collections.EMPTY_SET : oldDelegate;
Set<?> newSet = (newDelegate == null) ? Collections.EMPTY_SET : newDelegate;
fireEvent(new MySetChangeEvent(Diffs.computeSetDiff(oldSet, newSet)));
}
private ISetChangeListener getForwardingSetChangeListener() {
if(forwardingSetChangeListener == null) {
forwardingSetChangeListener = new ISetChangeListener() {
public void handleSetChange(SetChangeEvent event) {
SetChangeEvent myEvent = new MySetChangeEvent(event.diff);
fireEvent(myEvent);
}
};
}
return forwardingSetChangeListener;
}
//
// Nested types
//
class MySetChangeEvent extends SetChangeEvent {
private static final long serialVersionUID = 1L;
MySetChangeEvent(SetDiff diff) {
super(getRealObservable(), diff);
}
@Override
protected Object getListenerType() {
// We implement our own listener type because the type from the core framework is not accessible
return SET_EVENT_TYPE;
}
}
}
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