+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. 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
+ */
+package org.opendaylight.controller.sal.binding.impl;
+
+import org.opendaylight.controller.sal.binding.api.NotificationListener;
+import org.opendaylight.yangtools.yang.binding.Notification;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * An aggregated listener registration. This is a result of registering an invoker which can handle multiple
+ * interfaces at the same time. In order to support correct delivery, we need to maintain per-type registrations
+ * which get squashed if a notification which implements multiple interfaces is encountered.
+ *
+ * We take care of that by implementing alternate {@link #hashCode()}/{@link #equals(Object)}, which resolve
+ * to the backing aggregator.
+ *
+ * @param <N> Notification type
+ * @param <A> Aggregator type
+ */
+abstract class AggregatedNotificationListenerRegistration<N extends Notification, A> extends AbstractNotificationListenerRegistration<N> {
+ private final A aggregator;
+
+ protected AggregatedNotificationListenerRegistration(final Class<? extends Notification> type, final NotificationListener<N> listener, final A aggregator) {
+ super(type, listener);
+ this.aggregator = Preconditions.checkNotNull(aggregator);
+ }
+
+ protected A getAggregator() {
+ return aggregator;
+ }
+
+ @Override
+ public int hashCode() {
+ return aggregator.hashCode();
+ }
+
+ @Override
+ public boolean equals(final Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (obj == null) {
+ return false;
+ }
+ if (!this.getClass().equals(obj.getClass())) {
+ return false;
+ }
+
+ return aggregator.equals(((AggregatedNotificationListenerRegistration<?, ?>)obj).aggregator);
+ }
+}