Adding route subsystem code to support EVPN

Change-Id: I5d9715af8e2a9474892267c97cd4763f12be4816
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnRouteSet.java b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnRouteSet.java
new file mode 100644
index 0000000..9530f09
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnRouteSet.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2017-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.incubator.net.routing;
+
+import com.google.common.collect.ImmutableSet;
+
+import java.util.Objects;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * A set of routes for a particular prefix in a route table.
+ */
+public class EvpnRouteSet {
+    private final RouteTableId tableId;
+
+    private final EvpnPrefix prefix;
+    private final Set<EvpnRoute> routes;
+
+    /**
+     * Creates a new route set.
+     *
+     * @param tableId route table ID
+     * @param prefix  IP prefix
+     * @param routes  routes for the given prefix
+     */
+    public EvpnRouteSet(RouteTableId tableId, EvpnPrefix prefix, Set<EvpnRoute>
+            routes) {
+        this.tableId = checkNotNull(tableId);
+        this.prefix = checkNotNull(prefix);
+        this.routes = ImmutableSet.copyOf(checkNotNull(routes));
+    }
+
+    /**
+     * Returns the route table ID.
+     *
+     * @return route table ID
+     */
+    public RouteTableId tableId() {
+        return tableId;
+    }
+
+    /**
+     * Returns the IP prefix.
+     *
+     * @return IP prefix
+     */
+    public EvpnPrefix prefix() {
+        return prefix;
+    }
+
+    /**
+     * Returns the set of routes.
+     *
+     * @return routes
+     */
+    public Set<EvpnRoute> routes() {
+        return routes;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(tableId, prefix, routes);
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (this == other) {
+            return true;
+        }
+
+        if (!(other instanceof RouteSet)) {
+            return false;
+        }
+
+        EvpnRouteSet that = (EvpnRouteSet) other;
+
+        return Objects.equals(this.tableId, that.tableId) &&
+                Objects.equals(this.prefix, that.prefix) &&
+                Objects.equals(this.routes, that.routes);
+    }
+}