ONOS-2184 - Implemented Virtual Network DeviceService and LinkService to use
VirtualNetwork service.

Change-Id: I695af440bc2fc5d688f8b9cf5201375bacd02e8a
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkLinkService.java b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkLinkService.java
new file mode 100644
index 0000000..7af0267
--- /dev/null
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkLinkService.java
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2016-present 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.incubator.net.virtual.impl;
+
+import org.onosproject.event.AbstractListenerManager;
+import org.onosproject.incubator.net.virtual.VirtualLink;
+import org.onosproject.incubator.net.virtual.VirtualNetwork;
+import org.onosproject.incubator.net.virtual.VirtualNetworkService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Link;
+import org.onosproject.net.link.LinkEvent;
+import org.onosproject.net.link.LinkListener;
+import org.onosproject.net.link.LinkService;
+
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Link service implementation built on the virtual network service.
+ */
+public class VirtualNetworkLinkService extends AbstractListenerManager<LinkEvent, LinkListener>
+        implements LinkService, VnetService {
+
+    private static final String NETWORK_NULL = "Network ID cannot be null";
+    private static final String DEVICE_NULL = "Device cannot be null";
+    private static final String CONNECT_POINT_NULL = "Connect point cannot be null";
+
+    private final VirtualNetwork network;
+    private final VirtualNetworkService manager;
+
+    /**
+     * Creates a new VirtualNetworkLinkService object.
+     *
+     * @param virtualNetworkManager virtual network manager service
+     * @param network               virtual network
+     */
+    public VirtualNetworkLinkService(VirtualNetworkService virtualNetworkManager, VirtualNetwork network) {
+        checkNotNull(network, NETWORK_NULL);
+        this.network = network;
+        this.manager = virtualNetworkManager;
+    }
+
+    @Override
+    public VirtualNetwork network() {
+        return network;
+    }
+
+    @Override
+    public int getLinkCount() {
+        return manager.getVirtualLinks(this.network.id()).size();
+    }
+
+    @Override
+    public Iterable<Link> getLinks() {
+        return manager.getVirtualLinks(this.network.id()).stream().collect(Collectors.toSet());
+    }
+
+    @Override
+    public Iterable<Link> getActiveLinks() {
+
+        return manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (link.state().equals(Link.State.ACTIVE)))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<Link> getDeviceLinks(DeviceId deviceId) {
+        checkNotNull(deviceId, DEVICE_NULL);
+        return manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (deviceId.equals(link.src().elementId()) ||
+                        deviceId.equals(link.dst().elementId())))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<Link> getDeviceEgressLinks(DeviceId deviceId) {
+        checkNotNull(deviceId, DEVICE_NULL);
+        return manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (deviceId.equals(link.dst().elementId())))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<Link> getDeviceIngressLinks(DeviceId deviceId) {
+        checkNotNull(deviceId, DEVICE_NULL);
+        return manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (deviceId.equals(link.src().elementId())))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<Link> getLinks(ConnectPoint connectPoint) {
+        checkNotNull(connectPoint, CONNECT_POINT_NULL);
+        return manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (connectPoint.equals(link.src()) ||
+                        connectPoint.equals(link.dst())))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<Link> getEgressLinks(ConnectPoint connectPoint) {
+        checkNotNull(connectPoint, CONNECT_POINT_NULL);
+        return manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (connectPoint.equals(link.dst())))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<Link> getIngressLinks(ConnectPoint connectPoint) {
+        checkNotNull(connectPoint, CONNECT_POINT_NULL);
+        return manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (connectPoint.equals(link.src())))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Link getLink(ConnectPoint src, ConnectPoint dst) {
+        checkNotNull(src, CONNECT_POINT_NULL);
+        checkNotNull(dst, CONNECT_POINT_NULL);
+        Optional<VirtualLink> foundLink =  manager.getVirtualLinks(this.network.id())
+                .stream()
+                .filter(link -> (src.equals(link.src()) &&
+                        dst.equals(link.dst())))
+                .findFirst();
+
+        if (foundLink.isPresent()) {
+            return foundLink.get();
+        }
+        return null;
+    }
+}