import net.minecraft.world.gen.layer.GenLayerRiver; //导入依赖的package包/类
public static GenLayer getTileableLayer(GenLayer layer) {
	Class<?> cl = layer.getClass();

	if (cl == GenLayerVoronoiZoom.class) {
		return new VoronoiZoomTileable((GenLayerVoronoiZoom) layer);
	}
	if (cl == GenLayerRiverMix.class) {
		return new RiverMixTileable((GenLayerRiverMix) layer);
	}
	if (cl == GenLayerSmooth.class) {
		return new SmoothTileable((GenLayerSmooth) layer);
	}
	if (cl == GenLayerZoom.class) {
		return new ZoomTileable((GenLayerZoom) layer);
	}
	if (cl == GenLayerShore.class) {
		return new ShoreTileable((GenLayerShore) layer);
	}
	if (cl == GenLayerAddIsland.class) {
		return new AddForestIslandTileable((GenLayerAddIsland) layer);
	}
	if (cl == GenLayerRareBiome.class) {
		return new MutatedPlainsTileable((GenLayerRareBiome) layer);
	}
	if (cl == GenLayerHills.class) {
		return new HillsAndMutatedTileable((GenLayerHills) layer);
	}
	if (cl == GenLayerBiomeEdge.class) {
		return new BiomeEdgeTileable((GenLayerBiomeEdge) layer);
	}
	if (cl == GenLayerBiome.class) {
		return new BiomeTileable((GenLayerBiome) layer);
	}
	if (cl == GenLayerDeepOcean.class) {
		return new DeepOceanTileable((GenLayerDeepOcean) layer);
	}
	if (cl == GenLayerAddMushroomIsland.class) {
		return new AddMushroomIslandTileable((GenLayerAddMushroomIsland) layer);
	}
	if (cl == GenLayerEdge.class) {
		return new EdgeTemperaturesTileable((GenLayerEdge) layer);
	}
	if (cl == GenLayerAddSnow.class) {
		return new AddSnowTileable((GenLayerAddSnow) layer);
	}
	if (cl == GenLayerRemoveTooMuchOcean.class) {
		return new RemoveTooMuchOceanTileable((GenLayerRemoveTooMuchOcean) layer);
	}
	if (cl == GenLayerFuzzyZoom.class) {
		return new FuzzyZoomTileable((GenLayerFuzzyZoom) layer);
	}
	if (cl == GenLayerIsland.class) {
		return new PlainsIslandTileable((GenLayerIsland) layer);
	}
	if (cl == GenLayerRiverInit.class) {
		return new RiverInitTileable((GenLayerRiverInit) layer);
	}
	if (cl == GenLayerRiver.class) {
		return new RiverTileable((GenLayerRiver) layer);
	}
	throw new UnknownGenLayerException(layer);
}
 

import net.minecraft.world.gen.layer.GenLayerRiver; //导入依赖的package包/类
public RiverTileable(GenLayerRiver originalLayer) {
	super(0, null);
	ReflectionUtil.copyNonStaticFieldsByType(GenLayer.class, long.class, originalLayer, this);
	ReflectionUtil.copyNonStaticFieldsByType(GenLayer.class, GenLayer.class, originalLayer, this);
	this.parent = GenLayerTileableUtil.getTileableLayer(this.parent);
}