Added nullable handler for JsonObject;

Author: edubovik

README.md

@@ -192,7 +192,7 @@ To subscribe on notifications you just need to create `NotificationFilter` where
  </details>
 
  ### Working with User
- To create `User` you just need to call  `createUser(String login, String password, User.RoleEnum role, StatusEnum status, JsonObject data)`  method of  `DeviceHive` class
+ To create `User` you just need to call  `createUser(String lastLogin, String password, User.RoleEnum role, StatusEnum status, JsonObject data)`  method of  `DeviceHive` class
 
  ```java
  DHResponse<User> response = deviceHive.createUser("javaLibTest", "123456", RoleEnum.ADMIN, StatusEnum.ACTIVE, null);
@@ -207,7 +207,7 @@ To subscribe on notifications you just need to create `NotificationFilter` where
 
  Properties:
  * `id` (read only)
- * `login`
+ * `lastLogin`
  * `role`
  * `password` (write only)
  * `data`

client/src/main/java/com/github/devicehive/client/service/User.java

@@ -23,6 +23,7 @@
 
 import com.github.devicehive.client.model.DHResponse;
 import com.github.devicehive.rest.model.RoleEnum;
+import com.github.devicehive.rest.model.UserInsert;
 import com.github.devicehive.rest.model.UserUpdate;
 import com.github.devicehive.rest.model.UserVO;
 import com.github.devicehive.rest.model.UserWithNetwork;
@@ -37,7 +38,7 @@ public class User {
     private String login;
     private RoleEnum role;
     private String password;
-    private JsonObject data=new JsonObject();
+    private JsonObject data = new JsonObject();
 
     private User() {
     }
@@ -55,6 +56,16 @@ public static User create(UserWithNetwork user) {
         return result;
     }
 
+    public static User create(UserInsert user) {
+        if (user == null) {
+            return null;
+        }
+        User result = new User();
+        result.setId(user.getId());
+        result.setData(user.getData());
+        return result;
+    }
+
     public static User create(UserVO user) {
         if (user == null) {
             return null;

client/src/main/java/com/github/devicehive/client/service/UserService.java

@@ -74,7 +74,7 @@ public DHResponse<User> createUser(String login, String password, RoleEnum role,
         UserApi userApi = createService(UserApi.class);
         UserUpdate userUpdate = createUserBody(login, password, role, statusEnum, data);
         DHResponse<User> response;
-        DHResponse<UserVO> result = execute(userApi.insertUser(userUpdate));
+        DHResponse<UserInsert> result = execute(userApi.insertUser(userUpdate));
         response = DHResponse.create(User.create(result.getData()), result.getFailureData());
         if (response.isSuccessful()) {
             updateUser(response, login, role, data);

rest/src/main/java/com/github/devicehive/rest/adapters/NullJsonAdapter.java

@@ -0,0 +1,46 @@
+/*
+ *
+ *
+ *   NullJsonAdapter.java
+ *
+ *   Copyright (C) 2018 DataArt
+ *
+ *   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 com.github.devicehive.rest.adapters;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+
+import java.lang.reflect.Type;
+import java.util.Objects;
+
+public class NullJsonAdapter implements JsonDeserializer<JsonObject> {
+    @Override
+    public JsonObject deserialize(JsonElement jsonElement, Type type,
+                                  JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
+        if (Objects.equals(type, JsonNull.class)) {
+            return new JsonObject();
+        }
+        if (jsonElement.isJsonNull()) {
+            return new JsonObject();
+        }
+        return jsonElement.getAsJsonObject();
+    }
+}

rest/src/main/java/com/github/devicehive/rest/api/UserApi.java

@@ -21,14 +21,24 @@
 
 package com.github.devicehive.rest.api;
 
+import com.github.devicehive.rest.model.UserInsert;
 import com.github.devicehive.rest.model.UserNetworkResponse;
 import com.github.devicehive.rest.model.UserUpdate;
+import com.github.devicehive.rest.model.UserVO;
 import com.github.devicehive.rest.model.UserWithNetwork;
-import retrofit2.Call;
-import retrofit2.http.*;
 
 import java.util.List;
 
+import retrofit2.Call;
+import retrofit2.http.Body;
+import retrofit2.http.DELETE;
+import retrofit2.http.GET;
+import retrofit2.http.Headers;
+import retrofit2.http.POST;
+import retrofit2.http.PUT;
+import retrofit2.http.Path;
+import retrofit2.http.Query;
+
 
 public interface UserApi {
   /**
@@ -110,8 +120,8 @@ Call<com.github.devicehive.rest.model.UserResponse> getUser(
     "Content-Type:application/json"
   })
   @POST("user")
-  Call<com.github.devicehive.rest.model.UserVO> insertUser(
-          @Body com.github.devicehive.rest.model.UserUpdate body
+  Call<UserInsert> insertUser(
+          @Body UserUpdate body
   );
 
   /**
@@ -131,7 +141,7 @@ Call<com.github.devicehive.rest.model.UserVO> insertUser(
     "Content-Type:application/json"
   })
   @GET("user")
-  Call<List<com.github.devicehive.rest.model.UserVO>> list(
+  Call<List<UserVO>> list(
          @Query("login") String login, @Query("loginPattern") String loginPattern, @Query("role") Integer role,
          @Query("status") Integer status, @Query("sortField") String sortField, @Query("sortOrder") String sortOrder,
          @Query("take") Integer take, @Query("skip") Integer skip
@@ -163,7 +173,7 @@ Call<Void> unassignNetwork(
   })
   @PUT("user/current")
   Call<Void> updateCurrentUser(
-          @Body com.github.devicehive.rest.model.UserUpdate body
+          @Body UserUpdate body
   );
 
   /**

rest/src/main/java/com/github/devicehive/rest/model/Device.java

@@ -34,7 +34,9 @@
 
 package com.github.devicehive.rest.model;
 
+import com.github.devicehive.rest.adapters.NullJsonAdapter;
 import com.google.gson.JsonObject;
+import com.google.gson.annotations.JsonAdapter;
 import com.google.gson.annotations.SerializedName;
 
 /**
@@ -47,7 +49,7 @@ public class Device {
 
     @SerializedName("name")
     private String name = null;
-
+    @JsonAdapter(value = NullJsonAdapter.class)
     @SerializedName("data")
     private JsonObject data = new JsonObject();
 

rest/src/main/java/com/github/devicehive/rest/model/DeviceCommand.java

@@ -34,7 +34,9 @@
 
 package com.github.devicehive.rest.model;
 
+import com.github.devicehive.rest.adapters.NullJsonAdapter;
 import com.google.gson.JsonObject;
+import com.google.gson.annotations.JsonAdapter;
 import com.google.gson.annotations.SerializedName;
 
 import org.joda.time.DateTime;
@@ -61,7 +63,7 @@ public class DeviceCommand implements Comparable<DeviceCommand> {
 
     @SerializedName("networkId")
     private Long networkId = null;
-
+    @JsonAdapter(value = NullJsonAdapter.class)
     @SerializedName("parameters")
     private JsonObject parameters = new JsonObject();
 
@@ -71,6 +73,7 @@ public class DeviceCommand implements Comparable<DeviceCommand> {
     @SerializedName("status")
     private String status = null;
 
+    @JsonAdapter(value = NullJsonAdapter.class)
     @SerializedName("result")
     private JsonObject result = new JsonObject();
 

rest/src/main/java/com/github/devicehive/rest/model/DeviceCommandWrapper.java

@@ -34,7 +34,9 @@
 
 package com.github.devicehive.rest.model;
 
+import com.github.devicehive.rest.adapters.NullJsonAdapter;
 import com.google.gson.JsonObject;
+import com.google.gson.annotations.JsonAdapter;
 import com.google.gson.annotations.SerializedName;
 
 import org.joda.time.DateTime;
@@ -50,6 +52,7 @@ public class DeviceCommandWrapper {
     @SerializedName("timestamp")
     private DateTime timestamp = null;
 
+    @JsonAdapter(value = NullJsonAdapter.class)
     @SerializedName("parameters")
     private JsonObject parameters = new JsonObject();
 
@@ -59,6 +62,7 @@ public class DeviceCommandWrapper {
     @SerializedName("status")
     private String status = null;
 
+    @JsonAdapter(value = NullJsonAdapter.class)
     @SerializedName("result")
     private JsonObject result = new JsonObject();
 

rest/src/main/java/com/github/devicehive/rest/model/DeviceNotification.java

@@ -34,7 +34,9 @@
 
 package com.github.devicehive.rest.model;
 
+import com.github.devicehive.rest.adapters.NullJsonAdapter;
 import com.google.gson.JsonObject;
+import com.google.gson.annotations.JsonAdapter;
 import com.google.gson.annotations.SerializedName;
 
 import org.joda.time.DateTime;
@@ -59,6 +61,7 @@ public class DeviceNotification implements Comparable<DeviceNotification> {
     @SerializedName("timestamp")
     private DateTime timestamp = null;
 
+    @JsonAdapter(value = NullJsonAdapter.class)
     @SerializedName("parameters")
     private JsonObject parameters = new JsonObject();
 

rest/src/main/java/com/github/devicehive/rest/model/DeviceNotificationWrapper.java

@@ -34,7 +34,9 @@
 
 package com.github.devicehive.rest.model;
 
+import com.github.devicehive.rest.adapters.NullJsonAdapter;
 import com.google.gson.JsonObject;
+import com.google.gson.annotations.JsonAdapter;
 import com.google.gson.annotations.SerializedName;
 
 import org.joda.time.DateTime;
@@ -50,7 +52,8 @@ public class DeviceNotificationWrapper {
     @SerializedName("timestamp")
     private DateTime timestamp = null;
 
-    @SerializedName("parameters")
+    @JsonAdapter(value = NullJsonAdapter.class)
+    @SerializedName("data")
     private JsonObject parameters = new JsonObject();
 
     public String getNotification() {