package org.telegram.telegrambots.api.commands;

import java.util.Collection;
import java.util.Map;

/**
 *
 */
public interface ICommandRegistery {

    /**
     * register a command
     *
     * @param command the command to register
     * @return        whether the command could be registered, was not already registered
     */
    boolean register(Command command);

    /**
     * register multiple commands
     *
     * @param commands commands to register
     * @return         map with results of the command register per command
     */
    Map<Command, Boolean> registerAll(Command... commands);

    /**
     * deregister a command
     *
     * @param command the command to deregister
     * @return        whether the command could be deregistered, was registered
     */
    boolean deregister(Command command);

    /**
     * deregister multiple commands
     *
     * @param commands commands to deregister
     * @return         map with results of the command deregistered per command
     */
    Map<Command, Boolean> deregisterAll(Command... commands);

    /**
     * get a collection of all registered commands
     *
     * @return a collection of registered commands
     */
    Collection<Command> getRegisteredCommands();

}
package org.telegram.telegrambots.api.commands;

import java.util.Map;

/**
 *
 */
public interface ICommandRegistery {

    /**
     * register a command
     *
     * @param command the command to register
     * @return        whether the command could be registered, was not already registered
     */
    boolean register(Command command);

    /**
     * register multiple commands
     *
     * @param commands commands to register
     * @return         map with results of the command register per command
     */
    Map<Command, Boolean> registerAll(Command... commands);

    /**
     * deregister a command
     *
     * @param command the command to deregister
     * @return        whether the command could be deregistered, was registered
     */
    boolean deregister(Command command);

    /**
     * deregister multiple commands
     *
     * @param commands commands to deregister
     * @return         map with results of the command deregistered per command
     */
    Map<Command, Boolean> deregisterAll(Command... commands);

}
--- 
+++ 
@@ -1,5 +1,6 @@
 package org.telegram.telegrambots.api.commands;
 
+import java.util.Collection;
 import java.util.Map;
 
 /**
@@ -39,4 +40,11 @@
      */
     Map<Command, Boolean> deregisterAll(Command... commands);
 
+    /**
+     * get a collection of all registered commands
+     *
+     * @return a collection of registered commands
+     */
+    Collection<Command> getRegisteredCommands();
+
 }
Add method to retrieve all registered commands
