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Java Mixins

This is a very simple library to show how to implement mixins in Java.

The next code you can see how to use the library. You can find more examples in the test folder.

final Person originalPerson = new SimplePerson("John", "Doe");

final Person person = new MixerBuilder(Person.class)
        .include(new Mixin(Entity.class, EntityDelegate.class))
        .include(new Mixin(MixtureInspector.class, MixtureInspectorDelegate.class))
        .build()
        .mixWith(originalPerson);

assertThat(person, isPerson(originalPerson));
assertThat((Entity) person, isEntity());
assertThat((MixtureInspector) person, hasOriginal(originalPerson));

Also you can use the library without the need of casting:

final Person originalPerson = new SimplePerson("John", "Doe");

final PoweredPerson poweredPerson = new MixerBuilder(PoweredPerson.class)
        .include(new Mixin(Entity.class, EntityDelegate.class))
        .include(new Mixin(MixtureInspector.class, MixtureInspectorDelegate.class))
        .build()
        .mixWith(originalPerson);

assertThat(poweredPerson, isPerson(originalPerson));
assertThat(poweredPerson, isEntity());
assertThat(poweredPerson, hasOriginal(originalPerson));

Also you can cache the factory:

// Builds the Factory just one time
final Mixer mixer = new MixerBuilder(PoweredPerson.class)
        .include(new Mixin(Entity.class, EntityDelegate.class))
        .include(new Mixin(MixtureInspector.class, MixtureInspectorDelegate.class))
        .build();

// Builds all the mixtures that you want!
final PoweredPerson poweredPerson1 = mixer.mixWith(new SimplePerson("John", "Doe"));
final PoweredPerson poweredPerson2 = mixer.mixWith(new SimplePerson("Jane", "Doe"));
final PoweredPerson poweredPerson3 = mixer.mixWith(new SimplePerson("Joe", "Public"));

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