Implement GriefingData

[Cybermaxke]

Todo:

• Also block hiding in stone for silverfish if griefing is disabled.

Test plugin code:

import org.spongepowered.api.data.key.Keys;
import org.spongepowered.api.entity.Entity;
import org.spongepowered.api.entity.living.player.Player;
import org.spongepowered.api.event.Listener;
import org.spongepowered.api.event.entity.InteractEntityEvent;
import org.spongepowered.api.event.filter.cause.First;
import org.spongepowered.api.plugin.Plugin;
import org.spongepowered.api.text.Text;

@Plugin(id = "test-plugin", name = "TestPlugin", version = "DEV")
public class TestPlugin {

    @Listener
    public void onPlayerInteractWithEntity(InteractEntityEvent.Secondary event, @First Player player) {
        Entity entity = event.getTargetEntity();
        if (entity.supports(Keys.CAN_GRIEF)) {
            boolean flag = !entity.get(Keys.CAN_GRIEF).get();
            entity.offer(Keys.CAN_GRIEF, flag);
            player.sendMessage(Text.of("Toggled griefing state of " + entity.getType().getName() +
                    " to " + flag));
        }
    }
}

Note:
There are much more entities (almost all living ones) that are able to grief the world, mainly through destroying crops. And in the explanation of GriefingData is it only limited to Enderman and Humanoids.

[JBYoshi]

I was going to do it myself, but it was more complex than I thought. Thanks for taking over it for me 😄

[gabizou]

Implementation shouldn't be required for testing a boolean based value.

[Cybermaxke]

@JBYoshi Haha, no problem, there had claimed it when I looked through the list ;)

[jamierocks]

Why call the GameRules object this$0?

[Cybermaxke]

It was like that in the examples, but I should probably change it.

[stephan-gh]

this$0 sounds fine if the redirect you have actually refers to the same object as the current mixin you're in, however if it refers to a different object like in this case you should better name it differently.

[Aaron1011]

@Cybermaxke: Could you rebase and squash this?

[jamierocks]

RIP