[BSC-3431] Introduce a REST API for directed-links. ...

[BSC-3431] Introduce a REST API for directed-links.  /wm/topology/directed-links/json will now return unidirectional links.

src/main/java/net/floodlightcontroller/linkdiscovery/web/DirectedLinksResource.java

+/**
+ *    Copyright 2013, Big Switch Networks, Inc.
+ *
+ *    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 net.floodlightcontroller.linkdiscovery.web;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LinkDirection;
+import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LinkType;
+import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.floodlightcontroller.linkdiscovery.LinkInfo;
+import net.floodlightcontroller.routing.Link;
+
+import org.restlet.resource.Get;
+import org.restlet.resource.ServerResource;
+
+public class DirectedLinksResource extends ServerResource {
+
+    @Get("json")
+    public Set<LinkWithType> retrieve() {
+        ILinkDiscoveryService ld = (ILinkDiscoveryService)getContext().getAttributes().
+                get(ILinkDiscoveryService.class.getCanonicalName());
+        Map<Link, LinkInfo> links = new HashMap<Link, LinkInfo>();
+        Set<LinkWithType> returnLinkSet = new HashSet<LinkWithType>();
+
+        if (ld != null) {
+            links.putAll(ld.getLinks());
+            for (Link link: links.keySet()) {
+                LinkInfo info = links.get(link);
+                LinkType type = ld.getLinkType(link, info);
+                if (type == LinkType.DIRECT_LINK || type == LinkType.TUNNEL) {
+                    LinkWithType lwt = new LinkWithType(link,
+                            info.getSrcPortState(),
+                            info.getDstPortState(),
+                            type,
+                            LinkDirection.UNIDIRECTIONAL);
+                    returnLinkSet.add(lwt);
+                }
+            }
+        }
+        return returnLinkSet;
+    }
+}

src/main/java/net/floodlightcontroller/topology/web/TopologyWebRoutable.java

@@ -19,6 +19,7 @@ package net.floodlightcontroller.topology.web;
 import org.restlet.Context;
 import org.restlet.routing.Router;
 
+import net.floodlightcontroller.linkdiscovery.web.DirectedLinksResource;
 import net.floodlightcontroller.linkdiscovery.web.ExternalLinksResource;
 import net.floodlightcontroller.linkdiscovery.web.LinksResource;
 import net.floodlightcontroller.restserver.RestletRoutable;
@@ -31,6 +32,7 @@ public class TopologyWebRoutable implements RestletRoutable {
     public Router getRestlet(Context context) {
         Router router = new Router(context);
         router.attach("/links/json", LinksResource.class);
+        router.attach("/directed-links/json", DirectedLinksResource.class);
         router.attach("/external-links/json", ExternalLinksResource.class);
         router.attach("/tunnellinks/json", TunnelLinksResource.class);
         router.attach("/switchclusters/json", SwitchClustersResource.class);