ONOS-7739 Support for P4Runtime multicast programming

Design doc: https://docs.google.com/document/d/13rkQlwr49M-uxQQEuxCMP7BFEPY2gtQ850Hn3gUfesU/edit#heading=h.lzdayib259sq

Change-Id: Ief00bec89fe5a9784b0ee13fdaafa3ae58ab654f
diff --git a/core/store/dist/src/main/java/org/onosproject/store/pi/impl/DistributedPiMulticastGroupTranslationStore.java b/core/store/dist/src/main/java/org/onosproject/store/pi/impl/DistributedPiMulticastGroupTranslationStore.java
new file mode 100644
index 0000000..c95b185
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/pi/impl/DistributedPiMulticastGroupTranslationStore.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.pi.impl;
+
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.net.group.Group;
+import org.onosproject.net.pi.runtime.PiMulticastGroupEntry;
+import org.onosproject.net.pi.service.PiMulticastGroupTranslationStore;
+
+/**
+ * Distributed implementation of a PI translation store for multicast groups.
+ */
+@Component(immediate = true)
+@Service
+public class DistributedPiMulticastGroupTranslationStore
+        extends AbstractDistributedPiTranslationStore<Group, PiMulticastGroupEntry>
+        implements PiMulticastGroupTranslationStore {
+
+    private static final String MAP_SIMPLE_NAME = "mc-group";
+
+    @Override
+    protected String mapSimpleName() {
+        return MAP_SIMPLE_NAME;
+    }
+}