private static boolean isAssignable()

in bval-jsr/src/main/java/org/apache/bval/util/reflection/TypeUtils.java [663:699]

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

    private static boolean isAssignable(final Type type, final TypeVariable<?> toTypeVariable,
            final Map<TypeVariable<?>, Type> typeVarAssigns) {
        if (type == null) {
            return true;
        }

        // only a null type can be assigned to null type which
        // would have cause the previous to return true
        if (toTypeVariable == null) {
            return false;
        }

        // all types are assignable to themselves
        if (toTypeVariable.equals(type)) {
            return true;
        }

        if (type instanceof TypeVariable<?>) {
            // a type variable is assignable to another type variable, if
            // and only if the former is the latter, extends the latter, or
            // is otherwise a descendant of the latter.
            final Type[] bounds = getImplicitBounds((TypeVariable<?>) type);

            for (final Type bound : bounds) {
                if (isAssignable(bound, toTypeVariable, typeVarAssigns)) {
                    return true;
                }
            }
        }

        if (type instanceof Class<?> || type instanceof ParameterizedType
                || type instanceof GenericArrayType || type instanceof WildcardType) {
            return false;
        }

        throw new IllegalStateException("found an unhandled type: " + type);
    }