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The Java Telegram Bot API is a wrapper for the Telegram HTTP Bot API

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package pro.zackpollard.telegrambot.api.internal.chat.message;

import org.json.JSONObject;
import pro.zackpollard.telegrambot.api.chat.Chat;
import pro.zackpollard.telegrambot.api.chat.message.Message;
import pro.zackpollard.telegrambot.api.chat.message.content.Content;
import pro.zackpollard.telegrambot.api.internal.chat.ChatImpl;
import pro.zackpollard.telegrambot.api.internal.chat.message.content.ContentImpl;
import pro.zackpollard.telegrambot.api.internal.user.UserImpl;
import pro.zackpollard.telegrambot.api.user.User;

/**
 * @author Zack Pollard
 */
public class MessageImpl implements Message {

	private final int message_id;
	private final User from;
	private final int date;
	private final Chat chat;
	private final User forward_from;
	private final int forward_date;
	private final Message reply_to_message;
	private final Content content;

	private MessageImpl(JSONObject jsonObject) {

		if(!jsonObject.isNull("result")) jsonObject = jsonObject.getJSONObject("result");

		message_id = jsonObject.getInt("message_id");
		from = UserImpl.createUser(jsonObject.optJSONObject("from"));
		date = jsonObject.getInt("date");
		chat = ChatImpl.createChat(jsonObject.getJSONObject("chat"));
		forward_from = UserImpl.createUser(jsonObject.optJSONObject("forward_from"));
		forward_date = jsonObject.optInt("forward_date");
		reply_to_message = MessageImpl.createMessage(jsonObject.optJSONObject("reply_to_message"));
		content = ContentImpl.createContent(jsonObject);
	}

	public static Message createMessage(JSONObject jsonObject) {

		return jsonObject != null ? new MessageImpl(jsonObject) : null;
	}

	/**
	 * Get the ID of the message
	 *
	 * @return The ID of the message
	 */
	@Override
	public int getMessageId() {
		return message_id;
	}

	/**
	 * Get the UNIX timestamp of when this message was sent/received at
	 *
	 * @return The timestamp
	 */
	@Override
	public int getTimeStamp() {
		return date;
	}

	/**
	 * Get the user that sent the message
	 *
	 * @return The user
	 */
	@Override
	public User getSender() {
		return from;
	}

	/**
	 * Get the chat this message was sent in
	 *
	 * @return The chat
	 */
	@Override
	public Chat getChat() {
		return chat;
	}

	/**
	 * Gets the user the message was forwarded from
	 *
	 * @return The user who's message was forwarded, or null if the message wasn't forwarded
	 */
	@Override
	public User getForwardedFrom() {
		return forward_from;
	}

	/**
	 * Gets the UNIX timestamp of when the original forwarded message was sent
	 *
	 * @return The forwarded messages timestamp, or 0 if the message wasn't forwarded
	 */
	@Override
	public int getForwardedDate() {
		return forward_date;
	}

	/**
	 * Gets the message that this message replied to
	 *
	 * @return The message that was replied to, or null if this message wasn't a reply
	 */
	@Override
	public Message getRepliedTo() {
		return reply_to_message;
	}

	/**
	 * Gets the content of the message
	 *
	 * @return The content of the message
	 */
	@Override
	public Content getContent() {
		return content;
	}
}