[AETHER-1299] Implement SPINE pinning policy in SR.

Additionally introduces a new CLI command. Also this review addresses
comments coming from the previous patch [24393] and fixes some issue
seen in the previous patch.

Change-Id: I5362d95ebe1c237eb5bdb13ec34ab109d25f9f7a
diff --git a/impl/src/main/java/org/onosproject/segmentrouting/cli/PolicyRedirectAddCommand.java b/impl/src/main/java/org/onosproject/segmentrouting/cli/PolicyRedirectAddCommand.java
new file mode 100644
index 0000000..e9f0279
--- /dev/null
+++ b/impl/src/main/java/org/onosproject/segmentrouting/cli/PolicyRedirectAddCommand.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2015-present Open Networking Foundation
+ *
+ * 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.segmentrouting.cli;
+
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.Option;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.glassfish.jersey.internal.guava.Sets;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.cli.net.DeviceIdCompleter;
+import org.onosproject.net.DeviceId;
+import org.onosproject.segmentrouting.policy.api.PolicyId;
+import org.onosproject.segmentrouting.policy.api.PolicyService;
+import org.onosproject.segmentrouting.policy.api.RedirectPolicy;
+
+import java.util.Set;
+
+/**
+ * Command to add a new redirect policy.
+ */
+@Service
+@Command(scope = "onos", name = "sr-policy-redirect-add",
+        description = "Create a new redirect policy")
+public class PolicyRedirectAddCommand extends AbstractShellCommand {
+
+    @Option(name = "-s", aliases = "--spine",
+            description = "Pin to spine",
+            valueToShowInHelp = "device:spine1",
+            multiValued = true)
+    @Completion(DeviceIdCompleter.class)
+    String[] spines = null;
+
+    @Override
+    protected void doExecute() {
+        Set<DeviceId> spinesToEnforce = spinesToEnforce();
+        if (spinesToEnforce.isEmpty()) {
+            print("Unable to submit redirect policy");
+            return;
+        }
+        PolicyService policyService = AbstractShellCommand.get(PolicyService.class);
+        PolicyId policyId = policyService.addOrUpdatePolicy(new RedirectPolicy(spinesToEnforce));
+        print("Policy %s has been submitted", policyId);
+    }
+
+    private Set<DeviceId> spinesToEnforce() {
+        Set<DeviceId> spinesToEnforce = Sets.newHashSet();
+        if (spines != null) {
+            for (String spine : spines) {
+                spinesToEnforce.add(DeviceId.deviceId(spine));
+            }
+        }
+        return spinesToEnforce;
+    }
+}