Add group table, flow rules by listening to openstack node events

Change-Id: Ifbb1ae9c812e9bc24260e960c17b5430dcf59a11
diff --git a/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/cli/VtapIdCompleter.java b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/cli/VtapIdCompleter.java
new file mode 100644
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--- /dev/null
+++ b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/cli/VtapIdCompleter.java
@@ -0,0 +1,53 @@
+/*
+ * 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.openstackvtap.cli;
+
+import org.apache.karaf.shell.console.Completer;
+import org.apache.karaf.shell.console.completer.StringsCompleter;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.openstackvtap.api.OpenstackVtap;
+import org.onosproject.openstackvtap.api.OpenstackVtapService;
+
+import java.util.List;
+import java.util.SortedSet;
+
+import static org.onosproject.openstackvtap.util.OpenstackVtapUtil.getVtapTypeFromString;
+
+/**
+ * vTap ID completer.
+ */
+public class VtapIdCompleter implements Completer {
+
+    private static final String VTAP_TYPE = "none";
+
+    @Override
+    public int complete(String buffer, int cursor, List<String> candidates) {
+
+        OpenstackVtap.Type type = getVtapTypeFromString(VTAP_TYPE);
+
+        // Delegate string completer
+        StringsCompleter delegate = new StringsCompleter();
+        SortedSet<String> strings = delegate.getStrings();
+
+        OpenstackVtapService service = AbstractShellCommand.get(OpenstackVtapService.class);
+
+        service.getVtaps(type).forEach(t -> {
+            strings.add(t.id().toString());
+        });
+
+        return delegate.complete(buffer, cursor, candidates);
+    }
+}