[ONOS-7444] Optimize SONA gw doesn't use vrouter app and quagga anymore
- Done: Deriving MAC address from external peer router and simple SNAT functionality
- Todo: SNAT, Floating IP-based routing

Change-Id: Ib1a5784a7304c44b28d7b2c9891b98fd13000db1
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/IpAddressCompleter.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/IpAddressCompleter.java
new file mode 100644
index 0000000..4ae1dd4
--- /dev/null
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/IpAddressCompleter.java
@@ -0,0 +1,54 @@
+/*
+ * 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.openstacknetworking.cli;
+
+import org.apache.karaf.shell.console.Completer;
+import org.apache.karaf.shell.console.completer.StringsCompleter;
+import org.onlab.packet.IpAddress;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.openstacknetworking.api.ExternalPeerRouter;
+import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+import java.util.SortedSet;
+import java.util.stream.Collectors;
+
+/**
+ * IP Address Completer.
+ */
+public class IpAddressCompleter implements Completer {
+
+    @Override
+    public int complete(String buffer, int cursor, List<String> candidates) {
+        StringsCompleter delegate = new StringsCompleter();
+        OpenstackNetworkService osNetService = AbstractShellCommand.get(OpenstackNetworkService.class);
+        Set<IpAddress> set = osNetService.externalPeerRouters().stream()
+                .map(ExternalPeerRouter::externalPeerRouterIp)
+                .collect(Collectors.toSet());
+        SortedSet<String> strings = delegate.getStrings();
+
+        Iterator<IpAddress> it = set.iterator();
+
+        while (it.hasNext()) {
+            strings.add(it.next().toString());
+        }
+
+        return delegate.complete(buffer, cursor, candidates);
+
+    }
+}