ONOS-5680 Implemented VirtualNetworkFlowRuleManager skeleton.

Change-Id: Ibf28d86551810cfe0c17103bc50656274b324f73
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkFlowRuleManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkFlowRuleManager.java
new file mode 100644
index 0000000..1bf8a4a
--- /dev/null
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkFlowRuleManager.java
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.virtual.impl;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.event.AbstractListenerManager;
+import org.onosproject.incubator.net.virtual.VirtualNetwork;
+import org.onosproject.incubator.net.virtual.VirtualNetworkService;
+import org.onosproject.incubator.net.virtual.VnetService;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.FlowRule;
+import org.onosproject.net.flow.FlowRuleEvent;
+import org.onosproject.net.flow.FlowRuleListener;
+import org.onosproject.net.flow.FlowRuleOperations;
+import org.onosproject.net.flow.FlowRuleService;
+import org.onosproject.net.flow.TableStatisticsEntry;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Flow rule service implementation built on the virtual network service.
+ */
+public class VirtualNetworkFlowRuleManager extends AbstractListenerManager<FlowRuleEvent, FlowRuleListener>
+        implements FlowRuleService, VnetService {
+
+    private static final String NETWORK_NULL = "Network ID cannot be null";
+    private final VirtualNetwork network;
+    private final VirtualNetworkService manager;
+
+    /**
+     * Creates a new VirtualNetworkFlowRuleService object.
+     *
+     * @param virtualNetworkManager virtual network manager service
+     * @param network               virtual network
+     */
+    public VirtualNetworkFlowRuleManager(VirtualNetworkService virtualNetworkManager, VirtualNetwork network) {
+        checkNotNull(network, NETWORK_NULL);
+        this.network = network;
+        this.manager = virtualNetworkManager;
+    }
+
+    @Override
+    public int getFlowRuleCount() {
+        return 0;
+    }
+
+    @Override
+    public Iterable<FlowEntry> getFlowEntries(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public void applyFlowRules(FlowRule... flowRules) {
+
+    }
+
+    @Override
+    public void purgeFlowRules(DeviceId deviceId) {
+
+    }
+
+    @Override
+    public void removeFlowRules(FlowRule... flowRules) {
+
+    }
+
+    @Override
+    public void removeFlowRulesById(ApplicationId appId) {
+
+    }
+
+    @Override
+    public Iterable<FlowRule> getFlowRulesById(ApplicationId id) {
+        return null;
+    }
+
+    @Override
+    public Iterable<FlowEntry> getFlowEntriesById(ApplicationId id) {
+        return null;
+    }
+
+    @Override
+    public Iterable<FlowRule> getFlowRulesByGroupId(ApplicationId appId, short groupId) {
+        return null;
+    }
+
+    @Override
+    public void apply(FlowRuleOperations ops) {
+
+    }
+
+    @Override
+    public Iterable<TableStatisticsEntry> getFlowTableStatistics(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public VirtualNetwork network() {
+        return network;
+    }
+}
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java
index 8ef2b52..b40386d 100644
--- a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java
@@ -53,6 +53,7 @@
 import org.onosproject.net.Link;
 import org.onosproject.net.PortNumber;
 import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.flow.FlowRuleService;
 import org.onosproject.net.host.HostService;
 import org.onosproject.net.intent.IntentEvent;
 import org.onosproject.net.intent.IntentListener;
@@ -392,6 +393,8 @@
             service = new VirtualNetworkHostManager(this, network);
         } else if (serviceKey.serviceClass.equals(PathService.class)) {
             service = new VirtualNetworkPathManager(this, network);
+        } else if (serviceKey.serviceClass.equals(FlowRuleService.class)) {
+            service = new VirtualNetworkFlowRuleManager(this, network);
         } else {
             return null;
         }