Sponge Virtual biomes test

CustomBiomes.java

/*
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package org.spongepowered.biomes;

import com.flowpowered.math.vector.Vector2i;
import org.spongepowered.api.Sponge;
import org.spongepowered.api.data.DataContainer;
import org.spongepowered.api.event.Listener;
import org.spongepowered.api.event.game.state.GamePreInitializationEvent;
import org.spongepowered.api.plugin.Plugin;
import org.spongepowered.api.world.biome.BiomeGenerationSettings;
import org.spongepowered.api.world.biome.BiomeType;
import org.spongepowered.api.world.biome.BiomeTypes;
import org.spongepowered.api.world.biome.VirtualBiomeType;
import org.spongepowered.api.world.extent.MutableBiomeArea;
import org.spongepowered.api.world.gen.BiomeGenerator;
import org.spongepowered.api.world.gen.WorldGenerator;
import org.spongepowered.api.world.gen.WorldGeneratorModifier;
import org.spongepowered.api.world.storage.WorldProperties;

@Plugin(id = "custombiomes_test")
public class CustomBiomes implements WorldGeneratorModifier {

    private BiomeType custom;

    @Listener
    public void onPreInit(GamePreInitializationEvent event) {
        this.custom = VirtualBiomeType.builder().name("Custom biome").persistedBiome(BiomeTypes.DESERT).build("custombiomes_test:custom");
        Sponge.getRegistry().register(BiomeType.class, this.custom);
        System.out.println(this.custom);
        System.out.println(Sponge.getRegistry().getType(BiomeType.class, "custombiomes_test:custom").orElse(null));
        Sponge.getRegistry().register(WorldGeneratorModifier.class, this);
    }

    @Override
    public String getId() {
        return "custombiomes_test:gen";
    }

    @Override
    public String getName() {
        return "custombiomes_test generator";
    }

    @Override
    public void modifyWorldGenerator(WorldProperties world, DataContainer container, WorldGenerator worldGenerator) {
        System.out.println("Applying custom biome generator");
        BiomeGen gen = new BiomeGen(worldGenerator.getBiomeGenerator(), this.custom);
        worldGenerator.setBiomeGenerator(gen);
        BiomeGenerationSettings settings = worldGenerator.getBiomeSettings(this.custom);
        settings.getGenerationPopulators().clear();
        settings.getPopulators().clear();
        settings.getGroundCoverLayers().clear();
    }

    public static class BiomeGen implements BiomeGenerator {

        private final BiomeGenerator wrapped;
        private final BiomeType virtual;

        public BiomeGen(BiomeGenerator wrapped, BiomeType virtual) {
            this.wrapped = wrapped;
            this.virtual = virtual;
        }

        @Override
        public void generateBiomes(MutableBiomeArea buffer) {
            Vector2i chunkMin = buffer.getBiomeMin().div(16);
            if (Math.abs(chunkMin.getX()) < 4 && Math.abs(chunkMin.getY()) < 4) {
                System.out.println("Setting " + chunkMin + " to custom biome");
                buffer.getBiomeWorker().fill((x, y) -> this.virtual);
            } else if (Math.abs(chunkMin.getX()) == 4 || Math.abs(chunkMin.getY()) == 4) {
                buffer.getBiomeWorker().fill((x, y) -> BiomeTypes.DESERT);
            } else {
                this.wrapped.generateBiomes(buffer);
            }
        }
    }

}