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Legacy API


All described API on this page will break in the future of BetonQuest. Main parts are already reworked in BetonQuest 2.0, other parts will mainly be reworked in 3.0 and 4.0 in the far future. All API on this page will get replacements, but there are none at the moment, so if you use this API, you will have to rewrite your code in the future. The documentation on this page may not be up to date and may not be complete anymore.

If we change something we will update the JavaDocs, so make sure to check them out if something seems to be missing here. This is the case because we prefer to delete outdated content from this page instead of updating it. New APIs will instead get their own page.


Currently, profiles are in development. So at the moment you can use the PlayerConverter class to get a profile.

Base concepts🔗

How to write and register new base concepts (events, conditions, objectives, variables) in BetonQuest.

Writing events🔗

Use the BetonQuest.registerEvent(String name, EventFactory eventFactory, StaticEventFactory staticEventFactory) and BetonQuest.registerNonStaticEvent(String name, EventFactory eventFactory) method. Read the Javadocs for more information and see the implementation of the existing events. to call an event, you need to use the BetonQuest.event(Profile profile, EventID eventID) method.

Writing objectives🔗

Objectives are more complicated because they use event handlers and they must store players' data. They extend Objective class. As always, you need to extract all data from supplied Instruction object in the constructor. Don't register listeners in the constructor!

If your objective handles changing data (like amount of mobs left to kill) you should create a class extending ObjectiveData. For example block objective does need to store amount of blocks left to place/break, and it does that using "BlockData" class. In the constructor it receives three strings: data string, ID of the player and ID of the objective. The latter two are used by BetonQuest to correctly save and load the former one from the database.

The data string should contains all the information you need in your objective. You must write a parser which will extract the information, methods used in the objective to alter the information, and override the toString() method in so it returns data string in the format parsable by your parser. Everytime the data in your object changes (like when killing a mob), you need to call update() method. It will save the data to the database.

Now you should override getDefaultDataInstruction() method. It must return the default data instruction understandable by your parser. For example in tame objective it will return the amount of mobs to tame. If you don't use data objects, just return an empty string (not null, just "").

In order for your objective to use the data object you have created you need to set the template variable to this object's class. If you're not defining the data object (because you don't need to handle the changing data), you should set the template simply to ObjectiveData.class.

Every time your objective accepts the player's action (for example killing the right mob in MobKill objective) it must be also verified with checkConditions() method. You don't want your objective ignoring all conditions, right? When you decide that the objective is completed you should call completeObjective() method. It will fire all events for you, so you don't have to do this manually.

start() and stop() methods must start objective's listeners and stop them accordingly. It's because the plugin turns the objective's listeners off if there are no players having it active. Here usually you will register/unregister listeners, but some objectives may be different. For example delay objective starts and cancels a runnable, instead of using listeners.

If your objective has some properties (used in variables) you should override the String getProperty(String property, String playerID) method. At runtime, if anyone uses %objective.yourObjective.theProperty% variable, BetonQuest will call that method with theProperty keyword as the first argument. Using it you should parse the data of the objective and return it as a String. If the supplied property name is incorrect or there was an error during getting the value, return an empty String and optionally log an error (LogUtils.getLogger().log(...)).

Objectives are registered the same way as conditions and events, using registerObjective(String name, Class<? extends Objective>) method.


IDE's typically autocomplete the wrong constructor. A correct constructor takes a single Instruction argument.

Writing conditions🔗

Writing conditions is easy too. They must extend Condition and override execute(String playerID) method, which should return true or false, depending on if the condition was met. You register them using registerConditions(String name, Class<? extends Condition) method from BetonQuest instance as well. The rest is almost the same, you're defining the constructor which will parse the Instruction object and overriding execute(String playerID) method to check if the player meets the condition. Don't worry about inverting it, as it's automatically done by BetonQuest.

Conditions are always getting an online player in the execute(String playerID) method, so you don't need to check that manually.


IDE's typically autocomplete the wrong constructor. A correct constructor takes a single Instruction argument.

Writing variables🔗

All variables need to extend Variable class. In the constructor you must parse the instruction and extract all information about your variable's behavior. Then you have to override the String getValue(String playerID) method. It should return the value of the variable for the supplied player. If it's impossible, it should return an empty String. Registering variables is done via BetonQuest.registerVariable(String name, Class<? extends Variable> variable) method.

Reading Instruction object🔗

The Instruction object parses the instruction string defined by the user and splits it into arguments. You can ask it for required arguments one by one with next() method or a parser method like getQuestItem(). Required arguments are the ones specified at the very beginning of an instruction string, for example add someTag in tag event. It will automatically throw InstructionParseException for you if it encounters an error, for example when there were no more arguments in user's instruction or it can't parse the argument to the type you asked for.

You can also ask for optional arguments: if the instruction string contains argument arg:something and you ask for optional arg, it will give you something. If there is no optional argument, it will return null. Don't worry about passing that null to parser methods like getLocation(String), they won't throw an error, they'll simply return that null.

Parser methods are there for your convenience. You could write a location parser for yourself, but there's no need for that, you can just use getLocation() or getLocation(String) method and receive LocationData object. The former method is simply getLocation(next()).

If your instruction is more complicated and Instruction class doesn't provide necessary methods, you can still parse the instruction string manually. You can get it with getInstruction() method. Just remember to throw InstructionParseException when the instruction supplied by the user is incorrect. BetonQuest will catch them and display a message in the console.

Firing events🔗

The plugin has a static method for firing events - event(String playerID, EventID eventID).

You can't fire an event directly using an instruction string.

final QuestPackage questPackage = Config.getPackages().get("myPackage") //(1)!
final Profile playerProfile = PlayerConverter.getID(player); //(2)!

BetonQuest.event(playerProfile, new EventID(questPackage, eventID)); 
  1. You can get the package from the Config class. It's a map of all packages, so you can get the one you need by its name.
  2. You can get the player's profile from the PlayerConverter class. You can use the player object to obtain a players profile.

Checking conditions🔗

BetonQuest has static boolean method condition(String playerID, String conditionID). It works similarly as event method described above.

Starting objectives🔗

The newObjective(String playerID, String objectiveID) method will launch the objective from start. You can however use resumeObjective(String playerID, String objectiveID, String instruction) to pass your own ObjectiveData instruction to the objective. It will not be saved to the database, because it is assumed that the objective has just been loaded from it and it exists there without any change. You should save it manually.

Creating additional conversation input/output methods🔗

In order to register an object as the conversation input/output it needs to implement ConversationIO interface. The constructor will receive three arguments: Conversation object, playerID String and NPC name String. It needs to parse the required data here and register all needed listeners. The setResponse(String response) method will receive NPC's text from the conversation. The addOption(String option) method will be called by the conversation for each reply option for this NPC text. The object must store all this data and when display() is called, it must use it to display the player the output. When it detects that the player chose an answer, it should pass it to the conversation using Conversation.passPlayerAnswer(int number) method. The integer is the number of the answer, starting at 1. clear() method will be called at the beginning of the new conversation cycle. It should clear all the previous options, so they do not overlap. end() method will be called when the conversation ends, and it should unregister all listeners. You can also call that message when you detect that the player forced conversation ending (for example by moving away from the NPC). Remember to notify the conversation about that using Conversation.end().

Registering the conversation inputs/outputs is done in the same way as objectives, events and conditions, through BetonQuest.registerConversationIO(String name, Class<? extends ConversationIO>) method.

Listening to BetonQuest (Bukkit) events🔗

BetonQuest exposes some of its actions as Bukkit events.
You can find these events in org.betonquest.betonquest.api package. Use them as you would use any other Bukkit event.

If you need any additional events just open an issue or pull request on GitHub.