Example - Awarding a player an advancement

Say we want to award a player an advancement. First, we need the structure of our command:

/award <player> <advancement>

Since we require a player, we will use the PlayerArgument for this example. Given a player, we can simply get the AdvancementProgress for that player, and then award the criteria required to fully complete the provided advancement.

LinkedHashMap<String, Argument> arguments = new LinkedHashMap<>();
arguments.put("player", new PlayerArgument());
arguments.put("advancement", new AdvancementArgument());

new CommandAPICommand("award")
    .withArguments(arguments)
    .executes((sender, args) -> {
        Player target = (Player) args[0];
        Advancement advancement = (Advancement) args[1];
        
        //Award all criteria for the advancement
        AdvancementProgress progress = target.getAdvancementProgress(advancement);
        for(String criteria : advancement.getCriteria()) {
            progress.awardCriteria(criteria);
        }
    })
    .register();