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/*
* Copyright 2014 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.store;
import java.util.List;
import org.onosproject.event.Event;
import static com.google.common.base.Preconditions.checkState;
/**
* Base implementation of a store.
*/
public class AbstractStore<E extends Event, D extends StoreDelegate<E>>
implements Store<E, D> {
protected D delegate;
@Override
public void setDelegate(D delegate) {
checkState(this.delegate == null || this.delegate == delegate,
"Store delegate already set");
this.delegate = delegate;
}
@Override
public void unsetDelegate(D delegate) {
if (this.delegate == delegate) {
this.delegate = null;
}
}
@Override
public boolean hasDelegate() {
return delegate != null;
}
/**
* Notifies the delegate with the specified event.
*
* @param event event to delegate
*/
protected void notifyDelegate(E event) {
if (delegate != null) {
delegate.notify(event);
}
}
/**
* Notifies the delegate with the specified list of events.
*
* @param events list of events to delegate
*/
protected void notifyDelegate(List<E> events) {
for (E event: events) {
notifyDelegate(event);
}
}
}
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