gistfile1.txt

private static Field mapDataBridgeMixin$dimensionId;
    private static Method getTypeMethod;

    @Shadow public abstract void updateMapData(int x, int y);

    static {
        Class<?> clazz = null;
        try {
            if (SpongeImplHooks.isDeobfuscatedEnvironment()) {
                mapDataBridgeMixin$dimensionId = MapData.class.getDeclaredField("dimension");
            } else {
                mapDataBridgeMixin$dimensionId = MapData.class.getDeclaredField("field_76200_c");
            }
            clazz = mapDataBridgeMixin$dimensionId.getType();
            // See java's Number class. all primitive number types are able to
            // be converted to from any number via .xxxValue()
            // its not the best solution, but due to primitive types you cant use
            // Class.cast() since it auto-boxes into the wrapper class, which can't be cast.
            String methodName = clazz.getName() + "Value";
            // Integer is what we currently use until we meet with the field
            getTypeMethod = Integer.class.getMethod(methodName);
            SpongeImpl.getLogger().warn("Got type method from Integer.class. Method name: " + methodName + ". class: " + clazz.getName());
        } catch (NoSuchMethodException e) {
            SpongeImpl.getLogger().fatal("Field dimensionId in MapData was not an instance of a valid type (byte, int etc). SpongeForge patches to int and normally it is a byte. Actual type was " + clazz.getTypeName());
        }
        catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
    }

@Override
    public int bridge$getDimensionId() {
        try {
            return ((Number)mapDataBridgeMixin$dimensionId.get(this)).intValue();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            return 0;
        }

    }

    @Override
    public void bridge$setDimensionId(int dimensionId) {
        try {
            mapDataBridgeMixin$dimensionId.set(this, getTypeMethod.invoke(dimensionId));
        } catch (IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }