[ONOS-2253] The CLIs of subnet resource.

Change-Id: I4e499ecfef33681bc78c6f865e3d0e85f7a85ee9
diff --git a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetQueryCommand.java b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetQueryCommand.java
new file mode 100644
index 0000000..f5a94f0
--- /dev/null
+++ b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetQueryCommand.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2015 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.vtnrsc.cli.subnet;
+
+import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.vtnrsc.Subnet;
+import org.onosproject.vtnrsc.SubnetId;
+import org.onosproject.vtnrsc.subnet.SubnetService;
+
+/**
+ * Supports for querying a subnet.
+ */
+@Command(scope = "onos", name = "subnets", description = "Supports for querying a subnet")
+public class SubnetQueryCommand extends AbstractShellCommand {
+
+    @Option(name = "-i", aliases = "--id", description = "Subnet id", required = false,
+            multiValued = false)
+    String id = null;
+
+    private static final String FMT = "subnetId=%s, networkId=%s, subnetName=%s,"
+            + "tenantId=%s, cidr=%s, dhcpEnabled=%s, gatewayIp=%s," + "ipVersion=%s";
+
+    @Override
+    protected void execute() {
+        SubnetService service = get(SubnetService.class);
+        if (id != null) {
+            Subnet subnet = service.getSubnet(SubnetId.subnetId(id));
+            printSubnet(subnet);
+        } else {
+            Iterable<Subnet> subnets = service.getSubnets();
+            if (subnets == null) {
+                return;
+            }
+            for (Subnet subnet : subnets) {
+                printSubnet(subnet);
+            }
+        }
+    }
+
+    private void printSubnet(Subnet subnet) {
+        print(FMT, subnet.id(), subnet.networkId(), subnet.subnetName(),
+              subnet.tenantId(), subnet.cidr(), subnet.dhcpEnabled(), subnet
+                      .gatewayIp(), subnet.ipVersion());
+
+    }
+}