Add a Polatis SNMP driver

Change-Id: I4ba986d9e7aebb33cbce413b70393db16fc9ffcc
diff --git a/drivers/polatis/snmp/src/main/java/org/onosproject/drivers/polatis/snmp/PolatisDeviceDescription.java b/drivers/polatis/snmp/src/main/java/org/onosproject/drivers/polatis/snmp/PolatisDeviceDescription.java
new file mode 100644
index 0000000..ff2862d
--- /dev/null
+++ b/drivers/polatis/snmp/src/main/java/org/onosproject/drivers/polatis/snmp/PolatisDeviceDescription.java
@@ -0,0 +1,125 @@
+/*
+ * Copyright 2018-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.drivers.polatis.snmp;
+
+import com.google.common.collect.Lists;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.SparseAnnotations;
+import org.onosproject.net.device.DefaultDeviceDescription;
+import org.onosproject.net.device.DeviceDescription;
+import org.onosproject.net.device.DeviceDescriptionDiscovery;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.device.PortDescription;
+import org.onosproject.net.driver.AbstractHandlerBehaviour;
+
+import org.onlab.packet.ChassisId;
+
+import org.slf4j.Logger;
+
+import java.io.IOException;
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import static org.onosproject.drivers.polatis.snmp.PolatisSnmpUtility.getOid;
+
+/**
+ * Representation of device information and ports via SNMP for all Polatis
+ * optical circuit switches.
+ */
+public class PolatisDeviceDescription extends AbstractHandlerBehaviour
+    implements DeviceDescriptionDiscovery {
+
+    private static final String DEFAULT_MANUFACTURER = "Polatis";
+    private static final String DEFAULT_DESCRIPTION_DATA = "Unknown";
+
+    private static final String SOFTWARE_VERSION_OID = ".1.3.6.1.4.1.26592.2.1.2.2.3.0";
+    private static final String PRODUCT_CODE_OID = ".1.3.6.1.4.1.26592.2.1.2.2.1.0";
+    private static final String SERIAL_NUMBER_OID = ".1.3.6.1.4.1.26592.2.1.2.2.2.0";
+
+    private final Logger log = getLogger(getClass());
+
+    /**
+     * Discovers device details, for Polatis Snmp device by getting the system
+     * information.
+     *
+     * @return device description
+     */
+    @Override
+    public DeviceDescription discoverDeviceDetails() {
+        DeviceService deviceService = checkNotNull(handler().get(DeviceService.class));
+        DeviceId deviceId = handler().data().deviceId();
+        Device device = deviceService.getDevice(deviceId);
+        if (device == null) {
+            return new DefaultDeviceDescription(deviceId.uri(), Device.Type.FIBER_SWITCH,
+                    DEFAULT_MANUFACTURER, DEFAULT_DESCRIPTION_DATA,
+                    DEFAULT_DESCRIPTION_DATA, DEFAULT_DESCRIPTION_DATA,
+                    new ChassisId());
+        }
+        String hardwareVersion = DEFAULT_DESCRIPTION_DATA;
+        try {
+            hardwareVersion = hardwareVersion();
+        } catch (IOException e) {
+            log.error("Error reading hardware version for device {} exception {}", deviceId, e);
+        }
+
+        String softwareVersion = DEFAULT_DESCRIPTION_DATA;
+        try {
+            softwareVersion = softwareVersion();
+        } catch (IOException e) {
+            log.error("Error reading software version for device {} exception {}", deviceId, e);
+        }
+
+        String serialNumber = DEFAULT_DESCRIPTION_DATA;
+        try {
+            serialNumber = serialNumber();
+        } catch (IOException e) {
+            log.error("Error reading serial number for device {} exception {}", deviceId, e);
+        }
+
+        return new DefaultDeviceDescription(deviceId.uri(), Device.Type.FIBER_SWITCH,
+                                            DEFAULT_MANUFACTURER, hardwareVersion,
+                                            softwareVersion, serialNumber,
+                                            device.chassisId(), (SparseAnnotations) device.annotations());
+    }
+
+    /**
+     * Discovers port details, for Polatis Snmp device.
+     *
+     * @return port list
+     */
+    @Override
+    public List<PortDescription> discoverPortDetails() {
+        // TODO: Implement me
+        return Lists.newLinkedList();
+        // return ImmutableList.copyOf(this.getPorts());
+    }
+
+    private String hardwareVersion() throws IOException {
+        return getOid(handler(), PRODUCT_CODE_OID);
+    }
+
+    private String softwareVersion() throws IOException {
+        return getOid(handler(), SOFTWARE_VERSION_OID);
+    }
+
+    private String serialNumber() throws IOException {
+        return getOid(handler(), SERIAL_NUMBER_OID);
+    }
+}