ONOS-7251 - Initial implementation of fabric.p4 L2 broadcast feature.

Thrift client cherry-picked from the commit dd5792ac9ee38a702c3128a34224852b5c284687

Change-Id: I989f2b2074485a892195889a7c976b518510da88
diff --git a/drivers/bmv2/src/main/java/org/onosproject/drivers/bmv2/api/runtime/Bmv2Handle.java b/drivers/bmv2/src/main/java/org/onosproject/drivers/bmv2/api/runtime/Bmv2Handle.java
new file mode 100644
index 0000000..373b41b
--- /dev/null
+++ b/drivers/bmv2/src/main/java/org/onosproject/drivers/bmv2/api/runtime/Bmv2Handle.java
@@ -0,0 +1,73 @@
+/*
+ * 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.drivers.bmv2.api.runtime;
+
+import org.onosproject.net.DeviceId;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Global identifier of an entity applied to a BMv2 device.
+ * @param <E> an object extending Bmv2Entity
+ */
+public abstract class Bmv2Handle<E extends Bmv2Entity> {
+
+    private final DeviceId deviceId;
+    private final E bmv2Entity;
+
+    protected Bmv2Handle(DeviceId deviceId, E bmv2Entity) {
+        this.deviceId = checkNotNull(deviceId);
+        this.bmv2Entity = checkNotNull(bmv2Entity);
+    }
+
+    /**
+     * Returns the device ID of this handle.
+     *
+     * @return device ID
+     */
+    public final DeviceId deviceId() {
+        return deviceId;
+    }
+
+    /**
+     * Returns the type of entity identified by this handle.
+     *
+     * @return BMv2 entity type
+     */
+    public final Bmv2EntityType entityType() {
+        return bmv2Entity.entityType();
+    }
+
+    /**
+     * The entity to which this handle is associated.
+     *
+     * @return Bmv2 entity
+     */
+    public final E bmv2Entity() {
+        return bmv2Entity;
+    }
+
+    @Override
+    public abstract int hashCode();
+
+    @Override
+    public abstract boolean equals(Object obj);
+
+    @Override
+    public abstract String toString();
+}