public static boolean isAssignableFrom()

in src/main/java/org/codehaus/groovy/runtime/MetaClassHelper.java [745:801]
53 lines of code
37 McCabe index (conditional complexity)

    public static boolean isAssignableFrom(Class classToTransformTo, Class classToTransformFrom) {
        if (classToTransformTo == classToTransformFrom
                || classToTransformFrom == null
                || classToTransformTo == Object.class) {
            return true;
        }

        classToTransformTo = TypeUtil.autoboxType(classToTransformTo);
        classToTransformFrom = TypeUtil.autoboxType(classToTransformFrom);
        if (classToTransformTo == classToTransformFrom) return true;

        // note: there is no coercion for boolean and char. Range matters, precision doesn't
        if (classToTransformTo == Integer.class) {
            if (classToTransformFrom == Short.class
                    || classToTransformFrom == Byte.class
                    || classToTransformFrom == BigInteger.class)
                return true;
        } else if (classToTransformTo == Double.class) {
            if (classToTransformFrom == Integer.class
                    || classToTransformFrom == Long.class
                    || classToTransformFrom == Short.class
                    || classToTransformFrom == Byte.class
                    || classToTransformFrom == Float.class
                    || classToTransformFrom == BigDecimal.class
                    || classToTransformFrom == BigInteger.class)
                return true;
        } else if (classToTransformTo == BigDecimal.class) {
            if (classToTransformFrom == Double.class
                    || classToTransformFrom == Integer.class
                    || classToTransformFrom == Long.class
                    || classToTransformFrom == Short.class
                    || classToTransformFrom == Byte.class
                    || classToTransformFrom == Float.class
                    || classToTransformFrom == BigInteger.class)
                return true;
        } else if (classToTransformTo == BigInteger.class) {
            if (isIntegerLongShortByte(classToTransformFrom))
                return true;
        } else if (classToTransformTo == Long.class) {
            if (classToTransformFrom == Integer.class
                    || classToTransformFrom == Short.class
                    || classToTransformFrom == Byte.class)
                return true;
        } else if (classToTransformTo == Float.class) {
            if (isIntegerLongShortByte(classToTransformFrom))
                return true;
        } else if (classToTransformTo == Short.class) {
            if (classToTransformFrom == Byte.class)
                return true;
        } else if (classToTransformTo == String.class) {
            if (GString.class.isAssignableFrom(classToTransformFrom)) {
                return true;
            }
        }

        return classToTransformTo.isAssignableFrom(classToTransformFrom);
    }