Mechanism to add Port annotation via netcfg

- intended to be used for driver to support ONOS-5895

Change-Id: Iddcf6f1b99273e8f8670b5f64fc9831e5f4ce3cd
diff --git a/core/net/src/main/java/org/onosproject/net/config/impl/BasicNetworkConfigs.java b/core/net/src/main/java/org/onosproject/net/config/impl/BasicNetworkConfigs.java
index 0bd8b91..5cabfbd 100644
--- a/core/net/src/main/java/org/onosproject/net/config/impl/BasicNetworkConfigs.java
+++ b/core/net/src/main/java/org/onosproject/net/config/impl/BasicNetworkConfigs.java
@@ -36,6 +36,7 @@
 import org.onosproject.net.config.basics.BasicLinkConfig;
 import org.onosproject.net.config.basics.BasicRegionConfig;
 import org.onosproject.net.config.basics.BasicUiTopoLayoutConfig;
+import org.onosproject.net.config.basics.PortAnnotationConfig;
 import org.onosproject.net.config.basics.SubjectFactories;
 import org.onosproject.net.region.RegionId;
 import org.onosproject.ui.model.topo.UiTopoLayoutId;
@@ -112,6 +113,14 @@
                 public BasicUiTopoLayoutConfig createConfig() {
                     return new BasicUiTopoLayoutConfig();
                 }
+            },
+            new ConfigFactory<ConnectPoint, PortAnnotationConfig>(CONNECT_POINT_SUBJECT_FACTORY,
+                    PortAnnotationConfig.class,
+                    PortAnnotationConfig.CONFIG_KEY) {
+                @Override
+                public PortAnnotationConfig createConfig() {
+                    return new PortAnnotationConfig();
+                }
             }
     );
 
diff --git a/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java b/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java
index a3dbcad..6fbb21c 100644
--- a/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java
+++ b/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java
@@ -58,6 +58,7 @@
 import org.onosproject.net.config.PortConfigOperator;
 import org.onosproject.net.config.PortConfigOperatorRegistry;
 import org.onosproject.net.config.basics.BasicDeviceConfig;
+import org.onosproject.net.config.basics.PortAnnotationConfig;
 import org.onosproject.net.device.DefaultPortDescription;
 import org.onosproject.net.device.DeviceAdminService;
 import org.onosproject.net.device.DeviceDescription;
@@ -148,6 +149,9 @@
         = synchronizedListMultimap(
            newListMultimap(new ConcurrentHashMap<>(), CopyOnWriteArrayList::new));
 
+    // not part of portOps. must be executed at the end
+    private PortAnnotationOperator portAnnotationOp;
+
     /**
      * Local storage for connectivity status of devices.
      */
@@ -165,6 +169,9 @@
 
     @Activate
     public void activate() {
+        portAnnotationOp = new PortAnnotationOperator(networkConfigService);
+        portOpsIndex.put(PortAnnotationConfig.class, portAnnotationOp);
+
         backgroundService = newSingleThreadScheduledExecutor(
                              groupedThreads("onos/device", "manager-background", log));
         localNodeId = clusterService.getLocalNode().id();
@@ -976,7 +983,7 @@
         for (PortConfigOperator portOp : portOps) {
             work = portOp.combine(cpt, work);
         }
-        return work;
+        return portAnnotationOp.combine(cpt, work);
     }
 
 }
diff --git a/core/net/src/main/java/org/onosproject/net/device/impl/PortAnnotationOperator.java b/core/net/src/main/java/org/onosproject/net/device/impl/PortAnnotationOperator.java
new file mode 100644
index 0000000..3041a07
--- /dev/null
+++ b/core/net/src/main/java/org/onosproject/net/device/impl/PortAnnotationOperator.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2017-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.net.device.impl;
+
+import java.util.Map;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.DefaultAnnotations.Builder;
+import org.onosproject.net.config.NetworkConfigService;
+import org.onosproject.net.config.PortConfigOperator;
+import org.onosproject.net.config.basics.PortAnnotationConfig;
+import org.onosproject.net.device.DefaultPortDescription;
+import org.onosproject.net.device.PortDescription;
+
+/**
+ * Implementations of {@link PortConfigOperator} to weave
+ * annotations added via {@link PortAnnotationConfig}.
+ */
+public class PortAnnotationOperator implements PortConfigOperator {
+
+    private NetworkConfigService networkConfigService;
+
+    /**
+     * Creates {@link PortAnnotationOperator} instance.
+     */
+    public PortAnnotationOperator() {
+    }
+
+    PortAnnotationOperator(NetworkConfigService networkConfigService) {
+        bindService(networkConfigService);
+    }
+
+    @Override
+    public void bindService(NetworkConfigService networkConfigService) {
+        this.networkConfigService = networkConfigService;
+    }
+
+    private PortAnnotationConfig lookupConfig(ConnectPoint cp) {
+        if (networkConfigService == null) {
+            return null;
+        }
+        return networkConfigService.getConfig(cp, PortAnnotationConfig.class);
+    }
+
+    @Override
+    public PortDescription combine(ConnectPoint cp, PortDescription descr) {
+        PortAnnotationConfig cfg = lookupConfig(cp);
+        if (cfg == null) {
+            return descr;
+        }
+        Map<String, String> annotations = cfg.annotations();
+        if (annotations.isEmpty()) {
+            return descr;
+        }
+
+        Builder builder = DefaultAnnotations.builder();
+        builder.putAll(descr.annotations());
+        builder.putAll(annotations);
+
+        return DefaultPortDescription.copyReplacingAnnotation(descr, builder.build());
+    }
+
+}