Route Simplification programming
Change-Id: If3d8aaa3fe2dad5538b10ddc54b97f504d0f1a35
diff --git a/app/src/main/java/org/onosproject/segmentrouting/RouteSimplifierUtils.java b/app/src/main/java/org/onosproject/segmentrouting/RouteSimplifierUtils.java
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+/*
+ * 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.segmentrouting;
+
+/**
+ * Utility class for route simplification.
+ */
+import com.google.common.collect.ImmutableList;
+import org.onlab.packet.IpPrefix;
+import org.onosproject.routeservice.ResolvedRoute;
+import org.onosproject.routeservice.Route;
+
+final class RouteSimplifierUtils {
+
+ /**
+ * When route with source type listed in leafExclusionRouteTypes,
+ * it will programme only on the leaf pair the nexthop attaches to. Other leaves will be ignored.
+ */
+ private static final ImmutableList<Route.Source> LEAF_EXCLUSION_ROUTE_TYPES =
+ ImmutableList.of(Route.Source.DHCP, Route.Source.RIP, Route.Source.DHCPLQ);
+
+ private SegmentRoutingManager srManager;
+
+ RouteSimplifierUtils(SegmentRoutingManager srManager) {
+
+ this.srManager = srManager;
+ }
+
+ /**
+ * Checking whether the leafExclusionRouteTypes contains the given source type.
+ *
+ * @return boolean if it containsd the source type.
+ * */
+ private boolean hasLeafExclusionEnabledForType(Route.Source s) {
+ return LEAF_EXCLUSION_ROUTE_TYPES.contains(s);
+ }
+
+ /*
+ * When route with any source of given prefix is listed in leafExclusionRouteTypes,
+ * it will programme only on the leaf pair the nexthop attaches to. Other leaves will be ignored.
+ *
+ * @param ipPrefix ip prefix of the route.
+ * @return boolean if contains the prefix of the mentioned source type.
+ * */
+ public boolean hasLeafExclusionEnabledForPrefix(IpPrefix ipPrefix) {
+ for (ResolvedRoute route : srManager.routeService.getAllResolvedRoutes(ipPrefix)) {
+ if (hasLeafExclusionEnabledForType(route.route().source())) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+}