| /* |
| * 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); |
| } |
| } |
| } |