Collection Keys

Collection keys are a set of keys that represent the metadata type for a collection, for you to have easier access to the metadata of a collection.

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List Key

Here's an example of defining a collection key for a list:

public class ListKeyTest {
    public static final MetaListKey<String> LIST_KEY = MetaKey.createList("plugin:list_key", String.class);

    public void test() {
        MetaStorage storage = MetaStorage.create();
        LIST_KEY.add(storage, "Hello, Fairy!");
        LIST_KEY.add(storage, "I'm a list!");

        List<String> list = storage.get(LIST_KEY);
        list.forEach(System.out::print); // Hello, Fairy! I'm a list!

        LIST_KEY.clear();
    }
}

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Set Key

Here's an example of defining a collection key for a set:

public class SetKeyTest {
    public static final MetaSetKey<String> SET_KEY = MetaKey.createSet("plugin:set_key", String.class);

    public void test() {
        MetaStorage storage = MetaStorage.create();
        SET_KEY.add(storage, "Hello, Fairy!");
        SET_KEY.add(storage, "I'm a set!");
        SET_KEY.add(storage, "Hello, Fairy!");

        Set<String> set = storage.get(SET_KEY);
        set.forEach(System.out::print); // Hello, Fairy! I'm a set!

        SET_KEY.clear();
    }
}

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Map Key

Here's an example of defining a collection key for a map:

public class MapKeyTest {
    public static final MetaMapKey<String, Integer> MAP_KEY = MetaKey.createMap("plugin:map_key", String.class, Integer.class);

    public void test() {
        MetaStorage storage = MetaStorage.create();
        MAP_KEY.put(storage, "Hello", 1);
        MAP_KEY.put(storage, "Fairy", 2);

        Map<String, Integer> map = storage.get(MAP_KEY);
        map.forEach((key, value) -> System.out.println(key + ": " + value)); // Hello: 1, Fairy: 2

        MAP_KEY.clear();
    }
}