Use guava

api/pom.xml

@@ -30,6 +30,10 @@
     <name>Telegram Bot API</name>
 
     <dependencies>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.squareup.retrofit2</groupId>
             <artifactId>retrofit</artifactId>

api/src/main/java/io/sgr/telegram/bot/api/http/CompletableFutureBasedCallAdapter.java

@@ -17,7 +17,7 @@
 
 package io.sgr.telegram.bot.api.http;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 import io.sgr.telegram.bot.api.models.http.ApiResponse;
 
@@ -37,11 +37,9 @@ class CompletableFutureBasedCallAdapter<T> implements CallAdapter<ApiResponse<T>
     private final Logger logger;
 
     CompletableFutureBasedCallAdapter(@Nonnull final Type responseType, final boolean retry, @Nonnull final Logger logger) {
-        notNull(responseType, "Missing response type!");
-        this.responseType = responseType;
+        this.responseType = checkNotNull(responseType, "Missing response type!");
         this.retry = retry;
-        notNull(logger, "Missing logger!");
-        this.logger = logger;
+        this.logger = checkNotNull(logger, "Missing logger!");
     }
 
     @Nonnull

api/src/main/java/io/sgr/telegram/bot/api/http/CompletableFutureBasedCallback.java

@@ -17,7 +17,7 @@
 
 package io.sgr.telegram.bot.api.http;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 import io.sgr.telegram.bot.api.exceptions.ApiCallException;
 import io.sgr.telegram.bot.api.models.http.ApiErrorResponse;
@@ -43,11 +43,9 @@ class CompletableFutureBasedCallback<T> implements Callback<ApiResponse<T>> {
     private final Logger logger;
 
     CompletableFutureBasedCallback(@Nonnull final CompletableFuture<T> future, final boolean retry, @Nonnull final Logger logger) {
-        notNull(future, "Missing future!");
-        this.future = future;
+        this.future = checkNotNull(future, "Missing future!");
         this.retry = retry;
-        notNull(logger, "Missing logger!");
-        this.logger = logger;
+        this.logger = checkNotNull(logger, "Missing logger!");
     }
 
     @Override public void onResponse(@Nonnull final Call<ApiResponse<T>> call, @Nonnull final Response<ApiResponse<T>> response) {

api/src/main/java/io/sgr/telegram/bot/api/http/DefaultCallAdapterFactory.java

@@ -17,7 +17,7 @@
 
 package io.sgr.telegram.bot.api.http;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 import io.sgr.telegram.bot.api.models.http.ApiResponse;
 
@@ -39,8 +39,7 @@ public class DefaultCallAdapterFactory extends CallAdapter.Factory {
 
     public DefaultCallAdapterFactory(final boolean retry, @Nonnull final Logger logger) {
         this.retry = retry;
-        notNull(logger, "Missing logger!");
-        this.logger = logger;
+        this.logger = checkNotNull(logger, "Missing logger!");
     }
 
     @Override

api/src/main/java/io/sgr/telegram/bot/api/models/Audio.java

@@ -17,7 +17,8 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -63,12 +64,11 @@ public Audio(
             @JsonProperty("mime_type") final String mimeType,
             @JsonProperty("file_size") final long fileSize,
             @JsonProperty("thumb") final PhotoSize thumb) {
-        notEmptyString(fileId, "File ID should be provided");
+        checkArgument(!isNullOrEmpty(fileId), "File ID should be provided");
         this.fileId = fileId;
+        checkArgument(!isNullOrEmpty(fileUniqueId), "File unique ID should be provided");
         this.fileUniqueId = fileUniqueId;
-        if (duration < 0) {
-            throw new IllegalArgumentException("Duration should be greater than or equal to zero");
-        }
+        checkArgument(duration >= 0, "Duration should be greater than or equal to zero");
         this.duration = duration;
         this.performer = performer;
         this.title = title;

api/src/main/java/io/sgr/telegram/bot/api/models/CallbackQuery.java

@@ -17,8 +17,9 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -65,13 +66,12 @@ public CallbackQuery(
             @JsonProperty("chat_instance") String chatInstance,
             @JsonProperty("data") String data,
             @JsonProperty("game_short_name") String gameShortName) {
-        notEmptyString(id, "ID should be provided");
+        checkArgument(!isNullOrEmpty(id), "ID should be provided");
         this.id = id;
-        notNull(from, "Sender should be provided");
-        this.from = from;
+        this.from = checkNotNull(from, "Sender should be provided");
         this.message = message;
         this.inlineMessageId = inlineMessageId;
-        notEmptyString(chatInstance, "Chat instance should be provided");
+        checkArgument(!isNullOrEmpty(chatInstance), "Chat instance should be provided");
         this.chatInstance = chatInstance;
         this.data = data;
         this.gameShortName = gameShortName;

api/src/main/java/io/sgr/telegram/bot/api/models/Chat.java

@@ -17,7 +17,7 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -69,7 +69,7 @@ public class Chat {
      */
     @JsonCreator
     public Chat(
-            @JsonProperty("id") Long id,
+            @JsonProperty("id") long id,
             @JsonProperty("type") ChatType type,
             @JsonProperty("title") String title,
             @JsonProperty("username") String username,
@@ -83,13 +83,11 @@ public Chat(
             @JsonProperty("slow_mode_delay") Integer slowModeDelay,
             @JsonProperty("sticker_set_name") String stickerSetName,
             @JsonProperty("can_set_sticker_set") Boolean canSetStickerSet) {
-        notNull(id, "Chat ID should be provided.");
         if (Math.abs(id) > 1e13) {
             throw new IllegalArgumentException(String.format("Unique identifier for this chat should not exceeding 1e13 by absolute value, but got %d", id));
         }
         this.id = id;
-        notNull(type, "ChatType should be provided.");
-        this.type = type;
+        this.type = checkNotNull(type, "ChatType should be provided.");
         this.title = title;
         this.username = username;
         this.firstName = firstName;

api/src/main/java/io/sgr/telegram/bot/api/models/ChatMember.java

@@ -17,7 +17,7 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -100,10 +100,8 @@ public ChatMember(
             @JsonProperty("can_send_polls") final Boolean canSendPolls,
             @JsonProperty("can_send_other_messages") final Boolean canSendOtherMessage,
             @JsonProperty("can_add_web_page_previews") final Boolean canAddWebPagePreviews) {
-        notNull(user, "User should be provided.");
-        this.user = user;
-        notNull(status, "Chat isMember status should be provided.");
-        this.status = status;
+        this.user = checkNotNull(user, "User should be provided.");
+        this.status = checkNotNull(status, "Chat isMember status should be provided.");
         this.customTitle = customTitle;
         this.untilDate = untilDate;
         this.canBeEdited = canBeEdited;

api/src/main/java/io/sgr/telegram/bot/api/models/ChatMemberStatus.java

@@ -17,7 +17,8 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 
@@ -44,7 +45,7 @@ public enum ChatMemberStatus {
      */
     @JsonCreator
     public static ChatMemberStatus fromString(final String str) {
-        notEmptyString(str, "Cannot parse ChatMemberStatus from null or empty string!");
+        checkArgument(!isNullOrEmpty(str), "Cannot parse ChatMemberStatus from null or empty string!");
         return ChatMemberStatus.valueOf(str.toUpperCase(Locale.ENGLISH));
     }
 

api/src/main/java/io/sgr/telegram/bot/api/models/ChatType.java

@@ -17,7 +17,8 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 
@@ -42,7 +43,7 @@ public enum ChatType {
      */
     @JsonCreator
     public static ChatType fromString(final String str) {
-        notEmptyString(str, "Cannot parse ChatType from null or empty string!");
+        checkArgument(!isNullOrEmpty(str), "Cannot parse ChatType from null or empty string!");
         return ChatType.valueOf(str.toUpperCase(Locale.ENGLISH));
     }
 

api/src/main/java/io/sgr/telegram/bot/api/models/Contact.java

@@ -17,7 +17,8 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -55,9 +56,9 @@ public Contact(
             @JsonProperty("last_name") String lastName,
             @JsonProperty("user_id") Long userId,
             @JsonProperty("vcard") final String vCard) {
-        notEmptyString(phoneNumber, "Phone number should be provided.");
+        checkArgument(!isNullOrEmpty(phoneNumber), "Phone number should be provided.");
         this.phoneNumber = phoneNumber;
-        notEmptyString(phoneNumber, "First name should be provided.");
+        checkArgument(!isNullOrEmpty(firstName), "First name should be provided.");
         this.firstName = firstName;
         this.lastName = lastName;
         this.userId = userId;

api/src/main/java/io/sgr/telegram/bot/api/models/Document.java

@@ -17,7 +17,8 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -57,8 +58,9 @@ public Document(
             @JsonProperty("file_name") final String fileName,
             @JsonProperty("mime_type") final String mimeType,
             @JsonProperty("file_size") final long fileSize) {
-        notEmptyString(fileId, "File ID should be provided");
+        checkArgument(!isNullOrEmpty(fileId), "File ID should be provided");
         this.fileId = fileId;
+        checkArgument(!isNullOrEmpty(fileUniqueId), "File unique ID should be provided");
         this.fileUniqueId = fileUniqueId;
         this.thumb = thumb;
         this.fileName = fileName;

api/src/main/java/io/sgr/telegram/bot/api/models/File.java

@@ -17,10 +17,10 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
-import io.sgr.telegram.bot.api.utils.Preconditions;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
@@ -50,8 +50,9 @@ public File(
             @JsonProperty("file_unique_id") final String fileUniqueId,
             @JsonProperty("file_size") final Long fileSize,
             @JsonProperty("file_path") final String filePath) {
-        notEmptyString(fileId, "File ID should be provided");
+        checkArgument(!isNullOrEmpty(fileId), "File ID should be provided");
         this.fileId = fileId;
+        checkArgument(!isNullOrEmpty(fileUniqueId), "File unique ID should be provided");
         this.fileUniqueId = fileUniqueId;
         this.fileSize = fileSize;
         this.filePath = filePath;

api/src/main/java/io/sgr/telegram/bot/api/models/Message.java

@@ -17,10 +17,9 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 import io.sgr.telegram.bot.api.models.game.Game;
-import io.sgr.telegram.bot.api.models.markups.InlineKeyboardButton;
 import io.sgr.telegram.bot.api.models.markups.InlineKeyboardMarkup;
 import io.sgr.telegram.bot.api.models.sticker.Sticker;
 import io.sgr.telegram.bot.api.utils.JsonUtil;
@@ -142,7 +141,7 @@ public class Message {
      * @param replyMarkup Optional. Inline keyboard attached to the message. login_url buttons are represented as ordinary url buttons.
      */
     public Message(
-            @JsonProperty("message_id") Long id,
+            @JsonProperty("message_id") long id,
             @JsonProperty("from") final User from,
             @JsonProperty("date") final Long date,
             @JsonProperty("chat") final Chat chat,
@@ -185,11 +184,9 @@ public Message(
             @JsonProperty("pinned_message") final Message pinned,
             @JsonProperty("connected_website") final String connectedWebsite,
             @JsonProperty("reply_markup") final InlineKeyboardMarkup replyMarkup) {
-        notNull(id, "Message ID should be provided.");
         this.id = id;
         this.from = from;
-        notNull(date, "Message sent date should be provided.");
-        this.date = date;
+        this.date = checkNotNull(date, "Message sent date should be provided.");
         this.chat = chat;
         this.forwardFrom = forwardFrom;
         this.forwardFromChat = forwardFromChat;

api/src/main/java/io/sgr/telegram/bot/api/models/MessageEntity.java

@@ -17,8 +17,9 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -60,12 +61,10 @@ public MessageEntity(
             @JsonProperty("url") final String url,
             @JsonProperty("user") final User user,
             @JsonProperty("language") final String language) {
-        notEmptyString(type, "Message entity type should be provided.");
+        checkArgument(!isNullOrEmpty(type), "Message entity type should be provided.");
         this.type = type;
-        notNull(offset, "Message entity offset should be provided.");
-        this.offset = offset;
-        notNull(length, "Message entity length should be provided.");
-        this.length = length;
+        this.offset = checkNotNull(offset, "Message entity offset should be provided.");
+        this.length = checkNotNull(length, "Message entity length should be provided.");
         this.url = url;
         this.user = user;
         this.language = language;

api/src/main/java/io/sgr/telegram/bot/api/models/PhotoSize.java

@@ -17,7 +17,8 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notEmptyString;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
 
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
@@ -56,8 +57,9 @@ public PhotoSize(
             @JsonProperty("width") final int width,
             @JsonProperty("height") final int height,
             @JsonProperty("file_size") final Integer fileSize) {
-        notEmptyString(fileId, "File ID should be provided.");
+        checkArgument(!isNullOrEmpty(fileId), "File ID should be provided.");
         this.fileId = fileId;
+        checkArgument(!isNullOrEmpty(fileUniqueId), "File unique ID should be provided");
         this.fileUniqueId = fileUniqueId;
         this.width = width;
         this.height = height;

api/src/main/java/io/sgr/telegram/bot/api/models/TelegramError.java

@@ -17,8 +17,6 @@
 
 package io.sgr.telegram.bot.api.models;
 
-import static io.sgr.telegram.bot.api.utils.Preconditions.notNull;
-
 import io.sgr.telegram.bot.api.utils.JsonUtil;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
@@ -44,12 +42,10 @@ public class TelegramError {
      */
     @JsonCreator
     public TelegramError(
-            @JsonProperty("ok") Boolean ok,
-            @JsonProperty("error_code") Integer errorCode,
+            @JsonProperty("ok") boolean ok,
+            @JsonProperty("error_code") int errorCode,
             @JsonProperty("description") String description) {
-        notNull(ok, "Status should be provided.");
         this.ok = ok;
-        notNull(ok, "Error code should be provided.");
         this.errorCode = errorCode;
         this.description = description;
     }