Bindings

Using the Binder we create bindings, that is, linking a type to a provider (which can be a sub-class provider, an instance, a provider function, etc.)

An injector will always try to find an explicit binding for a type before trying to directly instantiate it. If the injector finds a binding for a type, the provider is called

Important: Note that we can not bind the same type to multiple providers

Direct Binding

A direct binding is a binding of a type to a provider function (team.unnamed.inject.Provider<T>)

binder.bind(Database.class).toProvider(() -> {
    System.out.println("Database requested!");
    return new SQLiteDependency("file.db");
});

The injector will call the function whenever Database is requested

Linked Binding

A linked binding is a binding of a type to a sub-type

binder.bind(Database.class).to(MySQLDatabase.class);

The injector will try to instantiate and supply MySQLDatabase whenever Database is requested

Instance Binding

An instance binding is a binding of a type to an instance

binder.bind(Database.class).toInstance(new SQLiteDatabase("file.db"));

The injector will return the given instance whenever Database is requested