annotate-link command

- Utility to add annotations to existing links.
  for ONOS-5810, etc.

Change-Id: I0a10e5cffe376fe935552dc9c1812741522746ee
diff --git a/cli/src/main/java/org/onosproject/cli/net/AnnotateLinkCommand.java b/cli/src/main/java/org/onosproject/cli/net/AnnotateLinkCommand.java
new file mode 100644
index 0000000..94f3076
--- /dev/null
+++ b/cli/src/main/java/org/onosproject/cli/net/AnnotateLinkCommand.java
@@ -0,0 +1,113 @@
+/*
+ * 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.cli.net;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.net.ConnectPoint.deviceConnectPoint;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.Link;
+import org.onosproject.net.link.DefaultLinkDescription;
+import org.onosproject.net.link.LinkDescription;
+import org.onosproject.net.link.LinkProvider;
+import org.onosproject.net.link.LinkProviderRegistry;
+import org.onosproject.net.link.LinkProviderService;
+import org.onosproject.net.link.LinkService;
+import org.onosproject.net.provider.ProviderId;
+
+/**
+ * Annotates network link model.
+ */
+@Command(scope = "onos", name = "annotate-link",
+         description = "Annotates network model entities")
+public class AnnotateLinkCommand extends AbstractShellCommand {
+
+    static final ProviderId PID = new ProviderId("cli", "org.onosproject.cli", true);
+
+    @Option(name = "--both",
+            description = "Add to both direction")
+    private boolean both = false;
+
+    @Argument(index = 0, name = "srcConnectPoint", description = "source Connect Point",
+            required = true, multiValued = false)
+    private String srcCp = null;
+
+    @Argument(index = 1, name = "dstConnectPoint", description = "destination Connect Point",
+            required = true, multiValued = false)
+    private String dstCp = null;
+
+
+
+    @Argument(index = 2, name = "key", description = "Annotation key",
+            required = true, multiValued = false)
+    private String key = null;
+
+    @Argument(index = 3, name = "value",
+            description = "Annotation value (null to remove)",
+            required = false, multiValued = false)
+    private String value = null;
+
+
+    @Override
+    protected void execute() {
+        LinkService service = get(LinkService.class);
+        ConnectPoint src = deviceConnectPoint(srcCp);
+        ConnectPoint dst = deviceConnectPoint(dstCp);
+
+        LinkProviderRegistry registry = get(LinkProviderRegistry.class);
+        CliLinkProvider provider = new CliLinkProvider();
+        LinkProviderService providerService = registry.register(provider);
+        try {
+            providerService.linkDetected(description(service.getLink(src, dst),
+                                                     key, value));
+            if (both) {
+                providerService.linkDetected(description(service.getLink(dst, src),
+                                                         key, value));
+            }
+        } finally {
+            registry.unregister(provider);
+        }
+    }
+
+
+    private LinkDescription description(Link link, String key, String value) {
+        checkNotNull(key, "Key cannot be null");
+        DefaultAnnotations.Builder builder = DefaultAnnotations.builder();
+        if (value != null) {
+            builder.set(key, value);
+        } else {
+            builder.remove(key);
+        }
+        return new DefaultLinkDescription(link.src(),
+                                          link.dst(),
+                                          link.type(),
+                                          link.isExpected(),
+                                          builder.build());
+    }
+
+    private static final class CliLinkProvider implements LinkProvider {
+        @Override
+        public ProviderId id() {
+            return PID;
+        }
+    }
+
+}