CLI to display workflow status

Change-Id: I3d269693b97237fad5f69723dec0619de2c45055
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkflowStatusCommand.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkflowStatusCommand.java
new file mode 100644
index 0000000..3746b5f
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkflowStatusCommand.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2019-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.workflow.cli;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.workflow.api.WorkplaceStore;
+import org.onosproject.workflow.api.WorkflowStore;
+import org.onosproject.workflow.api.WorkflowContext;
+import org.onosproject.workflow.api.Workflow;
+import org.onosproject.workflow.api.JsonDataModelTree;
+import org.onosproject.workflow.api.WorkflowException;
+
+
+import java.util.Objects;
+
+@Service
+@Command(scope = "onos", name = "workflow-nodes", description = "workflow status cli")
+public class WorkflowStatusCommand extends AbstractShellCommand {
+
+    static final String STATUS = "status";
+
+    @Argument(index = 0, name = "cmd",
+            description = "command(" + STATUS + "eval)",
+            required = true)
+    private String cmd = null;
+
+    @Override
+    protected void doExecute() {
+        if (Objects.isNull(cmd)) {
+            error("invalid cmd parameter");
+            return;
+        }
+
+
+        switch (cmd) {
+            case STATUS:
+                invoke();
+                break;
+            default:
+                print("Unsupported cmd: " + cmd);
+        }
+    }
+
+
+    private void invoke() {
+        try {
+            WorkflowStore workflowStore = get(WorkflowStore.class);
+            WorkplaceStore workplaceStore = get(WorkplaceStore.class);
+            System.out.printf("%-25s %-45s %-10s%n", "DEVICEIP", " WORKFLOW NAME", "WORKFLOW STATE");
+            for (WorkflowContext context : workplaceStore.getContexts()) {
+                for (Workflow workflow : workflowStore.getAll()) {
+                    if (context.workflowId().equals(workflow.id())) {
+                        JsonDataModelTree tree = (JsonDataModelTree) context.data();
+                        JsonNode mgmtIp = tree.nodeAt("/mgmtIp");
+                        System.out.printf("%-25s %-45s %-10s%n", mgmtIp, context.name(), context.state().toString());
+                    }
+
+                }
+            }
+
+        } catch (WorkflowException e) {
+            e.printStackTrace();
+        }
+
+    }
+}
+