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/*****************************************************************************
* Copyright (c) 2015 Christian W. Damus 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 - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.sync.policy;
import org.eclipse.papyrus.infra.sync.SyncFeature;
import org.eclipse.papyrus.infra.sync.SyncItem;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
/**
* A default implementation of the synchronization policy, which relies on the {@linkplain ISyncPolicyDelegate.Registry registered}
* policy {@linkplain ISyncPolicyDelegate delegates} to makes its decisions. Any {@linkplain SyncFeature feature} that does
* not have a delegate is synchronized by default.
*/
public class DefaultSyncPolicy implements ISyncPolicy {
private final ISyncPolicyDelegate.Registry delegateRegistry;
public DefaultSyncPolicy(ISyncPolicyDelegate.Registry delegateRegistry) {
super();
this.delegateRegistry = delegateRegistry;
}
@Override
public <M, T> boolean shouldSynchronize(SyncItem<M, T> from, SyncItem<M, T> to, SyncFeature<M, T, ?> feature) {
ISyncPolicyDelegate<M, T> delegate = delegateRegistry.get(feature);
return (delegate == null) || delegate.shouldSynchronize(from, to);
}
@Override
public <M, T> Iterable<? extends SyncItem<M, T>> filter(final SyncItem<M, T> from, Iterable<? extends SyncItem<M, T>> to, SyncFeature<M, T, ?> feature) {
final ISyncPolicyDelegate<M, T> delegate = delegateRegistry.get(feature);
return (delegate == null)
? to
: Iterables.filter(to, new Predicate<SyncItem<M, T>>() {
@Override
public boolean apply(SyncItem<M, T> input) {
return delegate.shouldSynchronize(from, input);
}
});
}
@Override
public <M, T, X> Iterable<? extends SyncFeature<M, T, X>> filter(final SyncItem<M, T> from, final SyncItem<M, T> to, Iterable<? extends SyncFeature<M, T, X>> features) {
return Iterables.filter(features, new Predicate<SyncFeature<M, T, X>>() {
@Override
public boolean apply(SyncFeature<M, T, X> input) {
return shouldSynchronize(from, to, input);
}
});
}
@Override
public <M, T> void observe(SyncItem<M, T> syncTarget, SyncFeature<M, T, ?> feature) {
final ISyncPolicyDelegate<M, T> delegate = delegateRegistry.get(feature);
// If there is no delegate, then there's no need to observe for changes in
// synchronizability because it can only ever be synchronized
if (delegate != null) {
delegate.observe(syncTarget);
}
}
}
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