add MessageEvent object and callback handler for it

sdk/src/main/java/com/vk/api/sdk/callback/CallbackApi.java

@@ -33,6 +33,7 @@ public class CallbackApi {
     private static final String CALLBACK_EVENT_MESSAGE_ALLOW = "message_allow";
     private static final String CALLBACK_EVENT_MESSAGE_DENY = "message_deny";
     private static final String CALLBACK_EVENT_MESSAGE_EDIT = "message_edit";
+    private static final String CALLBACK_EVENT_MESSAGE_EVENT = "message_event";
     private static final String CALLBACK_EVENT_PHOTO_NEW = "photo_new";
     private static final String CALLBACK_EVENT_PHOTO_COMMENT_NEW = "photo_comment_new";
     private static final String CALLBACK_EVENT_PHOTO_COMMENT_EDIT = "photo_comment_edit";
@@ -81,6 +82,8 @@ public class CallbackApi {
         }.getType());
         types.put(CALLBACK_EVENT_MESSAGE_DENY, new TypeToken<CallbackMessage<MessageDeny>>() {
         }.getType());
+        types.put(CALLBACK_EVENT_MESSAGE_EVENT, new TypeToken<CallbackMessage<MessageEvent>>() {
+        }.getType());
 
         types.put(CALLBACK_EVENT_PHOTO_NEW, new TypeToken<CallbackMessage<Photo>>() {
         }.getType());
@@ -201,6 +204,13 @@ public void messageDeny(Integer groupId, String secret, MessageDeny message) {
         messageDeny(groupId, message);
     }
 
+    public void messageEvent(Integer groupId, MessageEvent message) {
+    }
+
+    public void messageEvent(Integer groupId, String secret, MessageEvent message) {
+        messageEvent(groupId, message);
+    }
+
     public void photoNew(Integer groupId, Photo message) {
     }
 
@@ -482,6 +492,10 @@ public boolean parse(JsonObject json) {
                 messageDeny(message.getGroupId(), message.getSecret(), (MessageDeny) message.getObject());
                 break;
 
+            case CALLBACK_EVENT_MESSAGE_EVENT:
+                messageEvent(message.getGroupId(), message.getSecret(), (MessageEvent) message.getObject());
+                break;
+
             case CALLBACK_EVENT_PHOTO_NEW:
                 photoNew(message.getGroupId(), message.getSecret(), (Photo) message.getObject());
                 break;

sdk/src/main/java/com/vk/api/sdk/objects/callback/MessageEvent.java

@@ -0,0 +1,107 @@
+package com.vk.api.sdk.objects.callback;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import com.google.gson.annotations.SerializedName;
+import com.vk.api.sdk.objects.Validable;
+
+import java.util.Objects;
+
+/**
+ * MessageEvent object
+ */
+public class MessageEvent implements Validable {
+    @SerializedName("user_id")
+    private Integer userId;
+
+    @SerializedName("peer_id")
+    private Integer peerId;
+
+    @SerializedName("event_id")
+    private String eventId;
+
+    @SerializedName("payload")
+    private JsonObject payload;
+
+    @SerializedName("conversation_message_id")
+    private Integer conversationMessageId;
+
+    public Integer getUserId() {
+        return userId;
+    }
+
+    public MessageEvent setUserId(Integer userId) {
+        this.userId = userId;
+        return this;
+    }
+
+    public Integer getPeerId() {
+        return peerId;
+    }
+
+    public MessageEvent setPeerId(Integer peerId) {
+        this.peerId = peerId;
+        return this;
+    }
+
+    public String getEventId() {
+        return eventId;
+    }
+
+    public MessageEvent setEventId(String eventId) {
+        this.eventId = eventId;
+        return this;
+    }
+
+    public JsonObject getPayload() {
+        return payload;
+    }
+
+    public MessageEvent setPayload(JsonObject payload) {
+        this.payload = payload;
+        return this;
+    }
+
+    public Integer getConversationMessageId() {
+        return conversationMessageId;
+    }
+
+    public MessageEvent setConversationMessageId(Integer conversationMessageId) {
+        this.conversationMessageId = conversationMessageId;
+        return this;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(userId, peerId, eventId, payload, conversationMessageId);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        MessageEvent messageEvent = (MessageEvent) o;
+        return Objects.equals(userId, messageEvent.userId) &&
+                Objects.equals(peerId, messageEvent.peerId) &&
+                Objects.equals(eventId, messageEvent.eventId) &&
+                Objects.equals(payload, messageEvent.payload) &&
+                Objects.equals(conversationMessageId, messageEvent.conversationMessageId);
+    }
+
+    @Override
+    public String toString() {
+        final Gson gson = new Gson();
+        return gson.toJson(this);
+    }
+
+    public String toPrettyString() {
+        final StringBuilder sb = new StringBuilder("MessageEvent{");
+        sb.append("userId=").append(userId);
+        sb.append(", peerId='").append(peerId).append("'");
+        sb.append(", eventId='").append(eventId).append("'");
+        sb.append(", payload='").append(payload).append("'");
+        sb.append(", conversationMessageId='").append(conversationMessageId).append("'");
+        sb.append('}');
+        return sb.toString();
+    }
+}