private static Type getClosestParentType()

in bval-jsr/src/main/java/org/apache/bval/util/reflection/TypeUtils.java [925:963]

• 25 lines of code
• 8 McCabe index (conditional complexity)

    private static Type getClosestParentType(final Class<?> cls, final Class<?> superClass) {
        // only look at the interfaces if the super class is also an interface
        if (superClass.isInterface()) {
            // get the generic interfaces of the subject class
            final Type[] interfaceTypes = cls.getGenericInterfaces();
            // will hold the best generic interface match found
            Type genericInterface = null;

            // find the interface closest to the super class
            for (final Type midType : interfaceTypes) {
                Class<?> midClass = null;

                if (midType instanceof ParameterizedType) {
                    midClass = getRawType((ParameterizedType) midType);
                } else if (midType instanceof Class<?>) {
                    midClass = (Class<?>) midType;
                } else {
                    throw new IllegalStateException("Unexpected generic"
                            + " interface type found: " + midType);
                }

                // check if this interface is further up the inheritance chain
                // than the previously found match
                if (isAssignable(midClass, superClass)
                        && isAssignable(genericInterface, (Type) midClass)) {
                    genericInterface = midType;
                }
            }

            // found a match?
            if (genericInterface != null) {
                return genericInterface;
            }
        }

        // none of the interfaces were descendants of the target class, so the
        // super class has to be one, instead
        return cls.getGenericSuperclass();
    }