Fix for ONOS-291. Highlighting intents in ONOS GUI for selected links.

Change-Id: I757aa40b96d92014fa2d720539da20dd309ec9b1

@@ -19,11 +19,14 @@ package org.onosproject.ui.topo;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.Device;
 import org.onosproject.net.Device;
 import org.onosproject.net.Element;
 import org.onosproject.net.Element;
 import org.onosproject.net.Host;
 import org.onosproject.net.Host;
+import org.onosproject.net.Link;
 import org.onosproject.net.device.DeviceService;
 import org.onosproject.net.device.DeviceService;
 import org.onosproject.net.host.HostService;
 import org.onosproject.net.host.HostService;
+import org.onosproject.net.link.LinkService;
 import org.onosproject.ui.JsonUtils;
 import org.onosproject.ui.JsonUtils;
 import org.slf4j.Logger;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.slf4j.LoggerFactory;
@@ -33,11 +36,12 @@ import java.util.HashSet;
 import java.util.Set;
 import java.util.Set;
 
 
 import static com.google.common.base.Strings.isNullOrEmpty;
 import static com.google.common.base.Strings.isNullOrEmpty;
+import static org.onosproject.net.ConnectPoint.deviceConnectPoint;
 import static org.onosproject.net.DeviceId.deviceId;
 import static org.onosproject.net.DeviceId.deviceId;
 import static org.onosproject.net.HostId.hostId;
 import static org.onosproject.net.HostId.hostId;
 
 
 /**
 /**
- * Encapsulates a selection of devices and/or hosts from the topology view.
+ * Encapsulates a selection of devices, hosts and links from the topology view.
  */
  */
 public class NodeSelection {
 public class NodeSelection {
 
 
@@ -46,31 +50,38 @@ public class NodeSelection {
 
 
     private static final String IDS = "ids";
     private static final String IDS = "ids";
     private static final String HOVER = "hover";
     private static final String HOVER = "hover";
+    private static final String LINK_ID_DELIM = "-";
 
 
     private final DeviceService deviceService;
     private final DeviceService deviceService;
     private final HostService hostService;
     private final HostService hostService;
+    private final LinkService linkService;
 
 
     private final Set<String> ids;
     private final Set<String> ids;
     private final String hover;
     private final String hover;
 
 
     private final Set<Device> devices = new HashSet<>();
     private final Set<Device> devices = new HashSet<>();
     private final Set<Host> hosts = new HashSet<>();
     private final Set<Host> hosts = new HashSet<>();
+    private final Set<Link> links = new HashSet<>();
     private Element hovered;
     private Element hovered;
 
 
     /**
     /**
      * Creates a node selection entity, from the given payload, using the
      * Creates a node selection entity, from the given payload, using the
-     * supplied device and host services. Note that if a device or host was
-     * hovered over by the mouse, it is available via {@link #hovered()}.
+     * supplied link, device and host services. Note that if a link, device
+     * or host was hovered over by the mouse, it is available
+     * via {@link #hovered()}.
      *
      *
      * @param payload message payload
      * @param payload message payload
      * @param deviceService device service
      * @param deviceService device service
      * @param hostService host service
      * @param hostService host service
+     * @param linkService link service
      */
      */
     public NodeSelection(ObjectNode payload,
     public NodeSelection(ObjectNode payload,
                          DeviceService deviceService,
                          DeviceService deviceService,
-                         HostService hostService) {
+                         HostService hostService,
+                         LinkService linkService) {
         this.deviceService = deviceService;
         this.deviceService = deviceService;
         this.hostService = hostService;
         this.hostService = hostService;
+        this.linkService = linkService;
 
 
         ids = extractIds(payload);
         ids = extractIds(payload);
         hover = extractHover(payload);
         hover = extractHover(payload);
@@ -82,8 +93,9 @@ public class NodeSelection {
             setHoveredElement();
             setHoveredElement();
         }
         }
 
 
-        // now go find the devices and hosts that are in the selection list
-        Set<String> unmatched = findDevices(ids);
+        // now go find the links, devices and hosts that are in the selection list
+        Set<String> unmatched = findLinks(ids);
+        unmatched = findDevices(unmatched);
         unmatched = findHosts(unmatched);
         unmatched = findHosts(unmatched);
         if (unmatched.size() > 0) {
         if (unmatched.size() > 0) {
             log.debug("Skipping unmatched IDs {}", unmatched);
             log.debug("Skipping unmatched IDs {}", unmatched);
@@ -101,6 +113,15 @@ public class NodeSelection {
     }
     }
 
 
     /**
     /**
+     * Returns a view of the selected links (hover not included).
+     *
+     * @return selected links
+     */
+    public Set<Link> links() {
+        return Collections.unmodifiableSet(links);
+    }
+
+    /**
      * Returns a view of the selected devices, including the hovered device
      * Returns a view of the selected devices, including the hovered device
      * if there was one.
      * if there was one.
      *
      *
@@ -144,7 +165,24 @@ public class NodeSelection {
     }
     }
 
 
     /**
     /**
-     * Returns the element (host or device) over which the mouse was hovering,
+     * Returns a view of the selected links, including the hovered link
+     * if thee was one.
+     *
+     * @return selected (plus hovered) links
+     */
+    public Set<Link> linksWithHover() {
+        Set<Link> withHover;
+        if (hovered != null && hovered instanceof Link) {
+            withHover = new HashSet<>(links);
+            withHover.add((Link) hovered);
+        } else {
+            withHover = links;
+        }
+        return Collections.unmodifiableSet(withHover);
+    }
+
+    /**
+     * Returns the element (link, host or device) over which the mouse was hovering,
      * or null.
      * or null.
      *
      *
      * @return element hovered over
      * @return element hovered over
@@ -159,7 +197,7 @@ public class NodeSelection {
      * @return true if nothing selected
      * @return true if nothing selected
      */
      */
     public boolean none() {
     public boolean none() {
-        return devices().size() == 0 && hosts().size() == 0;
+        return devices().isEmpty() && hosts().isEmpty() && links().isEmpty();
     }
     }
 
 
     @Override
     @Override
@@ -169,6 +207,7 @@ public class NodeSelection {
                 ", hover='" + hover + '\'' +
                 ", hover='" + hover + '\'' +
                 ", #devices=" + devices.size() +
                 ", #devices=" + devices.size() +
                 ", #hosts=" + hosts.size() +
                 ", #hosts=" + hosts.size() +
+                ", #links=" + links.size() +
                 '}';
                 '}';
     }
     }
 
 
@@ -248,4 +287,34 @@ public class NodeSelection {
         }
         }
         return unmatched;
         return unmatched;
     }
     }
+
+    private Set<String> findLinks(Set<String> ids) {
+        Set<String> unmatched = new HashSet<>();
+        ConnectPoint cpSrc, cpDst;
+        Link link;
+
+        for (String id : ids) {
+            try {
+                String[] connectPoints = id.split(LINK_ID_DELIM);
+                if (connectPoints.length != 2) {
+                    unmatched.add(id);
+                    continue;
+                }
+
+                cpSrc = deviceConnectPoint(connectPoints[0]);
+                cpDst = deviceConnectPoint(connectPoints[1]);
+                link = linkService.getLink(cpSrc, cpDst);
+
+                if (link != null) {
+                    links.add(link);
+                } else {
+                    unmatched.add(id);
+                }
+
+            } catch (Exception e) {
+                unmatched.add(id);
+            }
+        }
+        return unmatched;
+    }
 }
 }

@@ -21,18 +21,24 @@ import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.ImmutableSet;
 import org.junit.Test;
 import org.junit.Test;
+import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.DefaultDevice;
 import org.onosproject.net.DefaultDevice;
 import org.onosproject.net.DefaultHost;
 import org.onosproject.net.DefaultHost;
+import org.onosproject.net.DefaultLink;
 import org.onosproject.net.Device;
 import org.onosproject.net.Device;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.Host;
 import org.onosproject.net.Host;
 import org.onosproject.net.HostId;
 import org.onosproject.net.HostId;
+import org.onosproject.net.Link;
 import org.onosproject.net.device.DeviceService;
 import org.onosproject.net.device.DeviceService;
 import org.onosproject.net.device.DeviceServiceAdapter;
 import org.onosproject.net.device.DeviceServiceAdapter;
 import org.onosproject.net.host.HostService;
 import org.onosproject.net.host.HostService;
 import org.onosproject.net.host.HostServiceAdapter;
 import org.onosproject.net.host.HostServiceAdapter;
+import org.onosproject.net.link.LinkService;
+import org.onosproject.net.link.LinkServiceAdapter;
 
 
 import static org.junit.Assert.*;
 import static org.junit.Assert.*;
+import static org.onosproject.net.Link.Type.DIRECT;
 
 
 /**
 /**
  * Unit tests for {@link NodeSelection}.
  * Unit tests for {@link NodeSelection}.
@@ -51,20 +57,31 @@ public class NodeSelectionTest {
         }
         }
     }
     }
 
 
+    private static class FakeLink extends DefaultLink {
+        FakeLink(ConnectPoint src, ConnectPoint dst) {
+            super(null, src, dst, DIRECT, Link.State.ACTIVE);
+        }
+    }
+
     private final ObjectMapper mapper = new ObjectMapper();
     private final ObjectMapper mapper = new ObjectMapper();
 
 
     private static final String IDS = "ids";
     private static final String IDS = "ids";
     private static final String HOVER = "hover";
     private static final String HOVER = "hover";
 
 
-    private static final DeviceId DEVICE_1_ID = DeviceId.deviceId("Device-1");
-    private static final DeviceId DEVICE_2_ID = DeviceId.deviceId("Device-2");
+    private static final DeviceId DEVICE_1_ID = DeviceId.deviceId("Device1");
+    private static final DeviceId DEVICE_2_ID = DeviceId.deviceId("Device2");
     private static final HostId HOST_A_ID = HostId.hostId("aa:aa:aa:aa:aa:aa/1");
     private static final HostId HOST_A_ID = HostId.hostId("aa:aa:aa:aa:aa:aa/1");
     private static final HostId HOST_B_ID = HostId.hostId("bb:bb:bb:bb:bb:bb/2");
     private static final HostId HOST_B_ID = HostId.hostId("bb:bb:bb:bb:bb:bb/2");
+    private static final String LINK_1_ID = "Device1/1-Device2/2";
+    private static final ConnectPoint CP_SRC = ConnectPoint.deviceConnectPoint("Device1/1");
+    private static final ConnectPoint CP_DST = ConnectPoint.deviceConnectPoint("Device2/2");
 
 
     private static final Device DEVICE_1 = new FakeDevice(DEVICE_1_ID);
     private static final Device DEVICE_1 = new FakeDevice(DEVICE_1_ID);
     private static final Device DEVICE_2 = new FakeDevice(DEVICE_2_ID);
     private static final Device DEVICE_2 = new FakeDevice(DEVICE_2_ID);
     private static final Host HOST_A = new FakeHost(HOST_A_ID);
     private static final Host HOST_A = new FakeHost(HOST_A_ID);
     private static final Host HOST_B = new FakeHost(HOST_B_ID);
     private static final Host HOST_B = new FakeHost(HOST_B_ID);
+    private static final Link LINK_A = new FakeLink(CP_SRC, CP_DST);
+    private static final Link LINK_B = new FakeLink(CP_DST, CP_SRC);
 
 
     // ==================
     // ==================
     // == FAKE SERVICES
     // == FAKE SERVICES
@@ -94,8 +111,21 @@ public class NodeSelectionTest {
         }
         }
     }
     }
 
 
+    private static class FakeLinks extends LinkServiceAdapter {
+        @Override
+        public Link getLink(ConnectPoint src, ConnectPoint dst) {
+            if (CP_SRC.equals(src) && CP_DST.equals(dst)) {
+                return LINK_A;
+            } else if (CP_SRC.equals(dst) && CP_DST.equals(src)) {
+                return LINK_B;
+            }
+            return null;
+        }
+    }
+
     private DeviceService deviceService = new FakeDevices();
     private DeviceService deviceService = new FakeDevices();
     private HostService hostService = new FakeHosts();
     private HostService hostService = new FakeHosts();
+    private LinkService linkService = new FakeLinks();
 
 
     private NodeSelection ns;
     private NodeSelection ns;
 
 
@@ -108,7 +138,7 @@ public class NodeSelectionTest {
     }
     }
 
 
     private NodeSelection createNodeSelection(ObjectNode payload) {
     private NodeSelection createNodeSelection(ObjectNode payload) {
-        return new NodeSelection(payload, deviceService, hostService);
+        return new NodeSelection(payload, deviceService, hostService, linkService);
     }
     }
 
 
     // selection JSON payload creation methods
     // selection JSON payload creation methods
@@ -134,6 +164,13 @@ public class NodeSelectionTest {
         ids.add(HOST_A_ID.toString());
         ids.add(HOST_A_ID.toString());
         return payload;
         return payload;
     }
     }
+    private ObjectNode oneLinkSelected() {
+        ObjectNode payload = objectNode();
+        ArrayNode ids = arrayNode();
+        payload.set(IDS, ids);
+        ids.add(LINK_1_ID.toString());
+        return payload;
+    }
 
 
     private ObjectNode twoHostsOneDeviceSelected() {
     private ObjectNode twoHostsOneDeviceSelected() {
         ObjectNode payload = objectNode();
         ObjectNode payload = objectNode();
@@ -204,6 +241,21 @@ public class NodeSelectionTest {
     }
     }
 
 
     @Test
     @Test
+    public void oneLink() {
+        ns = createNodeSelection(oneLinkSelected());
+        assertEquals("unexpected devices", 0, ns.devices().size());
+        assertEquals("unexpected devices w/hover", 0, ns.devicesWithHover().size());
+        assertEquals("unexpected hosts", 0, ns.hosts().size());
+        assertEquals("unexpected hosts w/hover", 0, ns.hostsWithHover().size());
+        assertEquals("missing link", 1, ns.links().size());
+        assertTrue("missing link A", ns.links().contains(LINK_A));
+        assertEquals("missing link w/hover", 1, ns.linksWithHover().size());
+        assertTrue("missing link A w/hover", ns.linksWithHover().contains(LINK_A));
+        assertFalse("unexpected selection", ns.none());
+        assertNull("hover?", ns.hovered());
+    }
+
+    @Test
     public void twoHostsOneDevice() {
     public void twoHostsOneDevice() {
         ns = createNodeSelection(twoHostsOneDeviceSelected());
         ns = createNodeSelection(twoHostsOneDeviceSelected());
         assertEquals("missing device", 1, ns.devices().size());
         assertEquals("missing device", 1, ns.devices().size());

@@ -534,7 +534,7 @@ public class TopologyViewMessageHandler extends TopologyViewMessageHandlerBase {
         @Override
         @Override
         public void process(long sid, ObjectNode payload) {
         public void process(long sid, ObjectNode payload) {
             NodeSelection nodeSelection =
             NodeSelection nodeSelection =
-                    new NodeSelection(payload, deviceService, hostService);
+                    new NodeSelection(payload, deviceService, hostService, linkService);
             traffic.monitor(Mode.DEV_LINK_FLOWS, nodeSelection);
             traffic.monitor(Mode.DEV_LINK_FLOWS, nodeSelection);
         }
         }
     }
     }
@@ -547,7 +547,7 @@ public class TopologyViewMessageHandler extends TopologyViewMessageHandlerBase {
         @Override
         @Override
         public void process(long sid, ObjectNode payload) {
         public void process(long sid, ObjectNode payload) {
             NodeSelection nodeSelection =
             NodeSelection nodeSelection =
-                    new NodeSelection(payload, deviceService, hostService);
+                    new NodeSelection(payload, deviceService, hostService, linkService);
             traffic.monitor(Mode.RELATED_INTENTS, nodeSelection);
             traffic.monitor(Mode.RELATED_INTENTS, nodeSelection);
         }
         }
     }
     }

@@ -49,7 +49,10 @@ public class IntentSelection {
      */
      */
     public IntentSelection(NodeSelection nodes, TopoIntentFilter filter) {
     public IntentSelection(NodeSelection nodes, TopoIntentFilter filter) {
         this.nodes = nodes;
         this.nodes = nodes;
-        intents = filter.findPathIntents(nodes.hostsWithHover(), nodes.devicesWithHover());
+        intents = filter.findPathIntents(
+                nodes.hostsWithHover(),
+                nodes.devicesWithHover(),
+                nodes.linksWithHover());
         if (intents.size() == 1) {
         if (intents.size() == 1) {
             index = 0;  // pre-select a single intent
             index = 0;  // pre-select a single intent
         }
         }

@@ -74,9 +74,12 @@ public class TopoIntentFilter {
      *
      *
      * @param hosts         set of hosts to query by
      * @param hosts         set of hosts to query by
      * @param devices       set of devices to query by
      * @param devices       set of devices to query by
-     * @return set of intents that 'match' all hosts and devices given
+     * @param links       set of links to query by
+     * @return set of intents that 'match' all hosts, devices and links given
      */
      */
-    public List<Intent> findPathIntents(Set<Host> hosts, Set<Device> devices) {
+    public List<Intent> findPathIntents(Set<Host> hosts,
+                                        Set<Device> devices,
+                                        Set<Link> links) {
         // start with all intents
         // start with all intents
         Iterable<Intent> sourceIntents = intentService.getIntents();
         Iterable<Intent> sourceIntents = intentService.getIntents();
 
 
@@ -85,7 +88,7 @@ public class TopoIntentFilter {
 
 
         // Iterate over all intents and produce a set that contains only those
         // Iterate over all intents and produce a set that contains only those
         // intents that target all selected hosts or derived edge connect points.
         // intents that target all selected hosts or derived edge connect points.
-        return getIntents(hosts, devices, edgePoints, sourceIntents);
+        return getIntents(hosts, devices, links, edgePoints, sourceIntents);
     }
     }
 
 
 
 
@@ -98,12 +101,12 @@ public class TopoIntentFilter {
         return edgePoints;
         return edgePoints;
     }
     }
 
 
-    // Produces a list of intents that target all selected hosts, devices or connect points.
-    private List<Intent> getIntents(Set<Host> hosts, Set<Device> devices,
+    // Produces a list of intents that target all selected hosts, devices, links or connect points.
+    private List<Intent> getIntents(Set<Host> hosts, Set<Device> devices, Set<Link> links,
                                     Set<ConnectPoint> edgePoints,
                                     Set<ConnectPoint> edgePoints,
                                     Iterable<Intent> sourceIntents) {
                                     Iterable<Intent> sourceIntents) {
         List<Intent> intents = new ArrayList<>();
         List<Intent> intents = new ArrayList<>();
-        if (hosts.isEmpty() && devices.isEmpty()) {
+        if (hosts.isEmpty() && devices.isEmpty() && links.isEmpty()) {
             return intents;
             return intents;
         }
         }
 
 
@@ -115,13 +118,13 @@ public class TopoIntentFilter {
                 boolean isRelevant = false;
                 boolean isRelevant = false;
                 if (intent instanceof HostToHostIntent) {
                 if (intent instanceof HostToHostIntent) {
                     isRelevant = isIntentRelevantToHosts((HostToHostIntent) intent, hosts) &&
                     isRelevant = isIntentRelevantToHosts((HostToHostIntent) intent, hosts) &&
-                            isIntentRelevantToDevices(intent, devices);
+                            isIntentRelevantToDevices(intent, devices) && isIntentRelevantToLinks(intent, links);
                 } else if (intent instanceof PointToPointIntent) {
                 } else if (intent instanceof PointToPointIntent) {
                     isRelevant = isIntentRelevant((PointToPointIntent) intent, edgePoints) &&
                     isRelevant = isIntentRelevant((PointToPointIntent) intent, edgePoints) &&
-                            isIntentRelevantToDevices(intent, devices);
+                            isIntentRelevantToDevices(intent, devices) && isIntentRelevantToLinks(intent, links);
                 } else if (intent instanceof MultiPointToSinglePointIntent) {
                 } else if (intent instanceof MultiPointToSinglePointIntent) {
                     isRelevant = isIntentRelevant((MultiPointToSinglePointIntent) intent, edgePoints) &&
                     isRelevant = isIntentRelevant((MultiPointToSinglePointIntent) intent, edgePoints) &&
-                            isIntentRelevantToDevices(intent, devices);
+                            isIntentRelevantToDevices(intent, devices) && isIntentRelevantToLinks(intent, links);
                 } else if (intent instanceof OpticalConnectivityIntent) {
                 } else if (intent instanceof OpticalConnectivityIntent) {
                     opticalIntents.add((OpticalConnectivityIntent) intent);
                     opticalIntents.add((OpticalConnectivityIntent) intent);
                 }
                 }
@@ -167,6 +170,17 @@ public class TopoIntentFilter {
         return true;
         return true;
     }
     }
 
 
+    // Indicates whether the specified intent involves all of the given links.
+    private boolean isIntentRelevantToLinks(Intent intent, Iterable<Link> links) {
+        List<Intent> installables = intentService.getInstallableIntents(intent.key());
+        for (Link link : links) {
+            if (!isIntentRelevantToLink(installables, link)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
     // Indicates whether the specified intent involves the given device.
     // Indicates whether the specified intent involves the given device.
     private boolean isIntentRelevantToDevice(List<Intent> installables, Device device) {
     private boolean isIntentRelevantToDevice(List<Intent> installables, Device device) {
         if (installables != null) {
         if (installables != null) {
@@ -196,6 +210,38 @@ public class TopoIntentFilter {
         return false;
         return false;
     }
     }
 
 
+    // Indicates whether the specified intent involves the given link.
+    private boolean isIntentRelevantToLink(List<Intent> installables, Link link) {
+        Link reverseLink = linkService.getLink(link.dst(), link.src());
+
+        if (installables != null) {
+            for (Intent installable : installables) {
+                if (installable instanceof PathIntent) {
+                    PathIntent pathIntent = (PathIntent) installable;
+                    return pathIntent.path().links().contains(link) ||
+                            pathIntent.path().links().contains(reverseLink);
+
+                } else if (installable instanceof FlowRuleIntent) {
+                    FlowRuleIntent flowRuleIntent = (FlowRuleIntent) installable;
+                    return flowRuleIntent.resources().contains(link) ||
+                            flowRuleIntent.resources().contains(reverseLink);
+
+                } else if (installable instanceof FlowObjectiveIntent) {
+                    FlowObjectiveIntent objectiveIntent = (FlowObjectiveIntent) installable;
+                    return objectiveIntent.resources().contains(link) ||
+                            objectiveIntent.resources().contains(reverseLink);
+
+                } else if (installable instanceof LinkCollectionIntent) {
+                    LinkCollectionIntent linksIntent = (LinkCollectionIntent) installable;
+                    return linksIntent.links().contains(link) ||
+                            linksIntent.links().contains(reverseLink);
+
+                }
+            }
+        }
+        return false;
+    }
+
     // Indicates whether the specified links involve the given device.
     // Indicates whether the specified links involve the given device.
     private boolean pathContainsDevice(Iterable<Link> links, DeviceId id) {
     private boolean pathContainsDevice(Iterable<Link> links, DeviceId id) {
         for (Link link : links) {
         for (Link link : links) {

@@ -192,7 +192,7 @@
             // else if we have node selections, deselect them all
             // else if we have node selections, deselect them all
             // (work already done)
             // (work already done)
 
 
-        } else if (tls.deselectLink()) {
+        } else if (tls.deselectAllLinks()) {
             // else if we have a link selected, deselect it
             // else if we have a link selected, deselect it
             // (work already done)
             // (work already done)
 
 

@@ -971,7 +971,7 @@
             node: function () { return node; },
             node: function () { return node; },
             zoomingOrPanning: zoomingOrPanning,
             zoomingOrPanning: zoomingOrPanning,
             updateDeviceColors: td3.updateDeviceColors,
             updateDeviceColors: td3.updateDeviceColors,
-            deselectLink: tls.deselectLink
+            deselectAllLinks: tls.deselectAllLinks
         };
         };
     }
     }
 
 

@@ -31,7 +31,7 @@
         network,
         network,
         showPorts = true,       // enable port highlighting by default
         showPorts = true,       // enable port highlighting by default
         enhancedLink = null,    // the link over which the mouse is hovering
         enhancedLink = null,    // the link over which the mouse is hovering
-        selectedLink = null;    // the link which is currently selected
+        selectedLinks = {};     // the links which are already selected
 
 
     // SVG elements;
     // SVG elements;
     var svg;
     var svg;
@@ -210,25 +210,33 @@
 
 
     function selectLink(ldata) {
     function selectLink(ldata) {
         // if the new link is same as old link, do nothing
         // if the new link is same as old link, do nothing
-        if (selectedLink && ldata && selectedLink.key === ldata.key) return;
-
-        // make sure no nodes are selected
-        tss.deselectAll();
-
-        // first, unenhance the currently enhanced link
-        if (selectedLink) {
-            unselLink(selectedLink);
-        }
-        selectedLink = ldata;
-        if (selectedLink) {
-            selLink(selectedLink);
-        }
+         if (d3.event.shiftKey && ldata.el.classed('selected')) {
+            unselLink(ldata);
+            return;
+         }
+
+         if (d3.event.shiftKey && !ldata.el.classed('selected')) {
+            selLink(ldata);
+            return;
+         }
+
+         tss.deselectAll();
+
+         if (!ldata.el.classed('selected')) {
+            selLink(ldata);
+            return;
+         }
+
+         if (ldata.el.classed('selected')) {
+            unselLink(ldata);
+         }
     }
     }
 
 
     function unselLink(d) {
     function unselLink(d) {
         // guard against link element not set
         // guard against link element not set
         if (d.el) {
         if (d.el) {
             d.el.classed('selected', false);
             d.el.classed('selected', false);
+            delete selectedLinks[d.key];
         }
         }
     }
     }
 
 
@@ -237,6 +245,7 @@
         if (!d.el) return;
         if (!d.el) return;
 
 
         d.el.classed('selected', true);
         d.el.classed('selected', true);
+        selectedLinks[d.key] = {key : d};
 
 
         tps.displayLink(d, tov.hooks.modifyLinkData);
         tps.displayLink(d, tov.hooks.modifyLinkData);
         tps.displaySomething();
         tps.displaySomething();
@@ -252,6 +261,9 @@
 
 
     function mouseClickHandler() {
     function mouseClickHandler() {
         var mp, link, node;
         var mp, link, node;
+        if (!d3.event.shiftKey) {
+            deselectAllLinks();
+        }
 
 
         if (!tss.clickConsumed()) {
         if (!tss.clickConsumed()) {
             mp = getLogicalMousePosition(this);
             mp = getLogicalMousePosition(this);
@@ -262,6 +274,7 @@
             } else {
             } else {
                 link = computeNearestLink(mp);
                 link = computeNearestLink(mp);
                 selectLink(link);
                 selectLink(link);
+                tss.selectObject(link);
             }
             }
         }
         }
     }
     }
@@ -285,13 +298,15 @@
         return on;
         return on;
     }
     }
 
 
-    function deselectLink() {
-        if (selectedLink) {
-            unselLink(selectedLink);
-            selectedLink = null;
-            return true;
+    function deselectAllLinks() {
+
+        if (Object.keys(selectedLinks).length > 0) {
+            network.links.forEach(function (d) {
+                if (selectedLinks[d.key]) {
+                    unselLink(d);
+                }
+            });
         }
         }
-        return false;
     }
     }
 
 
     // ==========================
     // ==========================
@@ -333,7 +348,7 @@
                 initLink: initLink,
                 initLink: initLink,
                 destroyLink: destroyLink,
                 destroyLink: destroyLink,
                 togglePorts: togglePorts,
                 togglePorts: togglePorts,
-                deselectLink: deselectLink
+                deselectAllLinks: deselectAllLinks
             };
             };
         }]);
         }]);
 }());
 }());

@@ -264,7 +264,7 @@
             table = detail.appendBody('table'),
             table = detail.appendBody('table'),
             tbody = table.append('tbody');
             tbody = table.append('tbody');
 
 
-        title.text('Selected Nodes');
+        title.text('Selected Items');
         ids.forEach(function (d, i) {
         ids.forEach(function (d, i) {
             addProp(tbody, i+1, d);
             addProp(tbody, i+1, d);
         });
         });

@@ -31,7 +31,7 @@
        node()                         // get ref to D3 selection of nodes
        node()                         // get ref to D3 selection of nodes
        zoomingOrPanning( ev )
        zoomingOrPanning( ev )
        updateDeviceColors( [dev] )
        updateDeviceColors( [dev] )
-       deselectLink()
+       deselectAllLinks()
      */
      */
 
 
     // internal state
     // internal state
@@ -106,12 +106,27 @@
                 }
                 }
             });
             });
         }
         }
-        if (!n) return;
+
+        if (obj.class === 'link') {
+
+            if (selections[obj.key]) {
+                deselectObject(obj.key);
+            } else {
+                selections[obj.key] = { obj: obj, el: el };
+                selectOrder.push(obj.key);
+            }
+
+            updateDetail();
+            return;
+        }
+
+        if (!n) {
+            return;
+        }
 
 
         if (nodeEv) {
         if (nodeEv) {
             consumeClick = true;
             consumeClick = true;
         }
         }
-        api.deselectLink();
 
 
         if (ev.shiftKey && n.classed('selected')) {
         if (ev.shiftKey && n.classed('selected')) {
             deselectObject(obj.id);
             deselectObject(obj.id);
@@ -196,6 +211,11 @@
 
 
     function singleSelect() {
     function singleSelect() {
         var data = getSel(0).obj;
         var data = getSel(0).obj;
+
+        //the link details are already taken care of in topoLink.js
+        if (data.class === 'link') {
+            return;
+        }
         requestDetails(data);
         requestDetails(data);
         // NOTE: detail panel is shown as a response to receiving
         // NOTE: detail panel is shown as a response to receiving
         //       a 'showDetails' event from the server. See 'showDetails'
         //       a 'showDetails' event from the server. See 'showDetails'

@@ -75,8 +75,10 @@
         var hov = api.hovered();
         var hov = api.hovered();
 
 
         function hoverValid() {
         function hoverValid() {
-            return hoverMode === 'intents' &&
-                hov && (hov.class === 'host' || hov.class === 'device');
+            return hoverMode === 'intents' && hov && (
+            hov.class === 'host' ||
+            hov.class === 'device' ||
+            hov.class === 'link');
         }
         }
 
 
         if (api.somethingSelected()) {
         if (api.somethingSelected()) {