Update device type delete service to reduce generality of the method by specifying different methods for each single responsibility

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderService.java

@@ -772,6 +772,24 @@ public interface DeviceManagementProviderService {
     DeviceTypeVersion getDeviceTypeVersion(String deviceTypeName, String version) throws
             DeviceManagementException;
 
+    /**
+     * Remove all versions of a device type
+     *
+     * @param deviceType Device type object
+     * @return True if device type versions are removed
+     * @throws DeviceManagementException Will be thrown if any service level or DAO level error occurs
+     */
+    boolean deleteDeviceTypeVersions(DeviceType deviceType)
+            throws DeviceManagementException;
+
+    /**
+     * Dis-enroll all devices passed
+     *
+     * @param devices List of devices to dis-enroll
+     * @throws DeviceManagementException Will be thrown if any service level or DAO level error occurs
+     */
+    void disEnrollDevices(List<Device> devices) throws DeviceManagementException;
+
     /**
      * Permanently delete a device type with all it's devices
      *

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java

@@ -153,6 +153,7 @@ import java.util.List;
 import java.util.Arrays;
 import java.util.Map;
 import java.util.Properties;
+import java.util.stream.Collectors;
 
 public class DeviceManagementProviderServiceImpl implements DeviceManagementProviderService,
         PluginInitializationListener {
@@ -3604,25 +3605,60 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
     public boolean deleteDeviceType(String deviceTypeName, DeviceType deviceType)
             throws DeviceManagementException {
         List<String> deviceIdentifiers;
-        List<DeviceTypeVersion> deviceTypeVersions;
-        boolean result;
-        int tenantId = getTenantId();
 
         try {
-            if (deviceType == null || deviceTypeName.isEmpty()) {
+            if (deviceType == null || deviceTypeName == null || deviceTypeName.isEmpty()) {
                 String msg = "Error, device type cannot be null or empty";
                 log.error(msg);
                 return false;
             }
-            DeviceManagementDAOFactory.beginTransaction();
+            List<Device> devices = getAllDevices(deviceTypeName, false);
-            List<Device> devices = deviceDAO.getDevices(deviceTypeName, this.getTenantId());
             if (devices == null || devices.isEmpty()) {
                 if (log.isDebugEnabled()) {
                     log.debug("No devices found for the device type: " + deviceTypeName);
                 }
             } else {
                 // dis-enroll devices
-                deviceIdentifiers = new ArrayList<>();
+                disEnrollDevices(devices);
+                // delete devices
+                deviceIdentifiers = devices.stream()
+                        .map(Device::getDeviceIdentifier).collect(Collectors.toList());
+                deleteDevices(deviceIdentifiers);
+            }
+            // remove device type versions
+            if (!deleteDeviceTypeVersions(deviceType)){
+                return false;
+            }
+            // delete device type
+            DeviceManagementDAOFactory.beginTransaction();
+            deviceTypeDAO.deleteDeviceType(getTenantId(), deviceType.getId());
+            DeviceManagementDAOFactory.commitTransaction();
+        } catch (InvalidDeviceException e) {
+            String msg = "Error occurred while deleting devices of type: " + deviceTypeName;
+            log.error(msg);
+            throw new DeviceManagementException(msg, e);
+        } catch (DeviceManagementDAOException e) {
+            DeviceManagementDAOFactory.rollbackTransaction();
+            String msg = "Error occurred while deleting device type of: " + deviceTypeName;
+            log.error(msg, e);
+            throw new DeviceManagementException(msg, e);
+        } catch (TransactionManagementException e) {
+            String msg = "Error occurred while initiating transaction";
+            log.error(msg, e);
+            throw new DeviceManagementException(msg, e);
+        } finally {
+            DeviceManagementDAOFactory.closeConnection();
+        }
+        return true;
+    }
+
+    @Override
+    public void disEnrollDevices(List<Device> devices)
+            throws DeviceManagementException {
+        int tenantId = getTenantId();
+
+        try {
+            DeviceManagementDAOFactory.beginTransaction();
             for (Device device : devices) {
                 if (device.getEnrolmentInfo().getStatus().equals(EnrolmentInfo.Status.REMOVED)) {
                     if (log.isDebugEnabled()) {
@@ -3652,61 +3688,67 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
                         throw new DeviceManagementException(msg, e);
                     }
                 }
-                    deviceIdentifiers.add(device.getDeviceIdentifier());
             }
             DeviceManagementDAOFactory.commitTransaction();
+        } catch (TransactionManagementException e) {
+            String msg = "Error occurred while initiating transaction";
+            log.error(msg, e);
+            throw new DeviceManagementException(msg, e);
+        } finally {
             DeviceManagementDAOFactory.closeConnection();
-                // delete devices
-                deleteDevices(deviceIdentifiers);
         }
-            // remove device type versions
+    }
+
+    @Override
+    public boolean deleteDeviceTypeVersions(DeviceType deviceType)
+            throws DeviceManagementException {
+        boolean result;
+        String deviceTypeName = deviceType.getName();
+        try {
             DeviceManagementDAOFactory.beginTransaction();
-            deviceTypeVersions = deviceTypeDAO.getDeviceTypeVersions(deviceType.getId(), deviceTypeName);
+            List<DeviceTypeVersion> deviceTypeVersions = deviceTypeDAO
+                    .getDeviceTypeVersions(deviceType.getId(), deviceTypeName);
             if (deviceTypeVersions == null || deviceTypeVersions.isEmpty()) {
                 if (log.isDebugEnabled()) {
-                    log.debug("Device of type: " + deviceTypeName + "doesn't have any type versions");
+                    log.debug("Device of type: " + deviceTypeName + "doesn't have any type " +
+                              "versions");
                 }
             } else {
                 for (DeviceTypeVersion deviceTypeVersion : deviceTypeVersions) {
                     result = deviceTypeDAO.isDeviceTypeVersionModifiable(deviceType.getId()
-                            , deviceTypeVersion.getVersionName(), tenantId);
+                            , deviceTypeVersion.getVersionName(), getTenantId());
                     if (!result) {
-                        String msg = "Device type of: " + deviceTypeName + "is unauthorized to modify " +
+                        String msg = "Device type of: " + deviceTypeName + "is unauthorized to " +
-                                     "version";
+                                     "modify version";
                         log.error(msg);
                         return false;
                     }
+                    deviceTypeVersion.setVersionStatus("REMOVED");
                     result = deviceTypeDAO.updateDeviceTypeVersion(deviceTypeVersion);
                     if (!result) {
-                        String msg = "Could not delete the version of device type: " +
+                        String msg = "Could not delete the version of device type: " + deviceTypeName;
-                                     deviceTypeName;
                         log.error(msg);
                         return false;
                     }
                 }
-            }
-            // delete device type
-            deviceTypeDAO.deleteDeviceType(tenantId, deviceType.getId());
                 DeviceManagementDAOFactory.commitTransaction();
-        } catch (InvalidDeviceException e) {
+            }
-            String msg = "Error occurred while deleting devices of type: " + deviceTypeName;
+        } catch (TransactionManagementException e) {
-            log.error(msg);
+            String msg = "Error occurred while initiating transaction";
+            log.error(msg, e);
             throw new DeviceManagementException(msg, e);
         } catch (DeviceManagementDAOException e) {
             DeviceManagementDAOFactory.rollbackTransaction();
             String msg = "Error occurred while deleting device type of: " + deviceTypeName;
             log.error(msg, e);
             throw new DeviceManagementException(msg, e);
-        } catch (TransactionManagementException e) {
-            String msg = "Error occurred while initiating transaction";
-            log.error(msg, e);
-            throw new DeviceManagementException(msg, e);
         } finally {
             DeviceManagementDAOFactory.closeConnection();
         }
         return true;
     }
 
+
     @Override
     public DeviceConfiguration getDeviceConfiguration(Map<String, String> deviceProps)
             throws DeviceManagementException, DeviceNotFoundException, UnauthorizedDeviceAccessException,