telegram_example/src/main/java/org/telegram/commands/HelpCommand.java

package org.telegram.commands;

import org.telegram.database.DatabaseManager;
import org.telegram.telegrambots.api.methods.send.SendMessage;
import org.telegram.telegrambots.api.objects.Chat;
import org.telegram.telegrambots.api.objects.User;
import org.telegram.telegrambots.bots.AbsSender;
import org.telegram.telegrambots.bots.commands.BotCommand;
import org.telegram.telegrambots.bots.commands.ICommandRegistry;
import org.telegram.telegrambots.exceptions.TelegramApiException;
import org.telegram.telegrambots.logging.BotLogger;

/**
 * This command helps the user to find the command they need
 *
 * @author Timo Schulz (Mit0x2)
 */
public class HelpCommand extends BotCommand {

    private static final String LOGTAG = "HELPCOMMAND";

    private final ICommandRegistry commandRegistry;

    public HelpCommand(ICommandRegistry commandRegistry) {
        super("help", "Get all the commands this bot provides");
        this.commandRegistry = commandRegistry;
    }

    @Override
    public void execute(AbsSender absSender, User user, Chat chat, String[] strings) {

        if (!DatabaseManager.getInstance().getUserStateForCommandsBot(user.getId())) {
            return;
        }

        StringBuilder helpMessageBuilder = new StringBuilder("<b>Help</b>\n");
        helpMessageBuilder.append("These are the registered commands for this Bot:\n\n");

        for (BotCommand botCommand : commandRegistry.getRegisteredCommands()) {
            helpMessageBuilder.append(botCommand.toString()).append("\n\n");
        }

        SendMessage helpMessage = new SendMessage();
        helpMessage.setChatId(chat.getId().toString());
        helpMessage.enableHtml(true);
        helpMessage.setText(helpMessageBuilder.toString());

        try {
            absSender.sendMessage(helpMessage);
        } catch (TelegramApiException e) {
            BotLogger.error(LOGTAG, e);
        }
    }
}