example.java

public class SpongeBlockRegistry implements BlockRegistry<BlockSnapshot> {

    private Map<BlockType, Integer> blockTypeMapping = new HashMap<>();
    private List<List<Set<BlockTrait<?>>>> typeVariants = new ArrayList<>();
    private List<BlockType> blockTypes = new ArrayList<>();

    @Override
    public BaseBlock getType(BlockSnapshot nativeType) {
        BlockType targetType = nativeType.getState().getType();
        Set<BlockTrait<?>> traitSet = new HashSet<>(nativeType.getState().getTraits());

        if (!blockTypeMapping.containsKey(targetType)) {
            blockTypes.add(targetType);
            typeVariants.add(new ArrayList<>());
            blockTypeMapping.put(targetType, typeVariants.size() - 1);
        }

        int blockId = blockTypeMapping.get(targetType);
        List<Set<BlockTrait<?>>> blockVariants = typeVariants.get(blockId);
        int variantId = blockVariants.indexOf(traitSet);
        if (variantId == -1) {
            blockVariants.add(traitSet);
            variantId = blockVariants.size() - 1;
        }

        return WorldEdit.getInstance().getBaseBlockFactory().getBaseBlock(blockId, variantId);
    }

    @Override
    public BlockSnapshot toNative(BaseBlock worldEditType) {
        BlockType type = blockTypes.get(worldEditType.getType());
        Set<BlockTrait<?>> traitSet = typeVariants.get(worldEditType.getId()).get(worldEditType.getData());
        for (BlockTrait<?> trait : traitSet) {
            BlockState.builder().blockType(type).build().withTrait(trait);

        }
        BlockSnapshot.builder()
    }
}