ONOS-2186 - GUI Topo Overlay - (WIP)
- split BiLink into abstract superclass and concrete subclasses.
- created BiLinkMap to collate bilinks (and derivative subclasses).
- added missing Javadocs, and other general cleanup.

Change-Id: Icfa85bc44a223c6cf245a4005170583dad1cc801
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/TrafficLinkMap.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/TrafficLinkMap.java
new file mode 100644
index 0000000..59965ad
--- /dev/null
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/TrafficLinkMap.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2015 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.ui.impl.topo;
+
+import org.onosproject.net.Link;
+import org.onosproject.net.LinkKey;
+
+/**
+ * Collection of {@link TrafficLink}s.
+ */
+public class TrafficLinkMap extends BiLinkMap<TrafficLink> {
+
+    @Override
+    public TrafficLink create(LinkKey key, Link link) {
+        return new TrafficLink(key, link);
+    }
+}