public static boolean isAssignable()

in log4j-core/src/main/java/org/apache/logging/log4j/core/util/TypeUtil.java [70:132]
53 lines of code
18 McCabe index (conditional complexity)

    public static boolean isAssignable(final Type lhs, final Type rhs) {
        Objects.requireNonNull(lhs, "No left hand side type provided");
        Objects.requireNonNull(rhs, "No right hand side type provided");
        if (lhs.equals(rhs)) {
            return true;
        }
        if (Object.class.equals(lhs)) {
            // everything is assignable to Object
            return true;
        }
        // raw type on left
        if (lhs instanceof Class<?>) {
            final Class<?> lhsClass = (Class<?>) lhs;
            if (rhs instanceof Class<?>) {
                // no generics involved
                final Class<?> rhsClass = (Class<?>) rhs;
                return lhsClass.isAssignableFrom(rhsClass);
            }
            if (rhs instanceof ParameterizedType) {
                // check to see if the parameterized type has the same raw type as the lhs; this is legal
                final Type rhsRawType = ((ParameterizedType) rhs).getRawType();
                if (rhsRawType instanceof Class<?>) {
                    return lhsClass.isAssignableFrom((Class<?>) rhsRawType);
                }
            }
            if (lhsClass.isArray() && rhs instanceof GenericArrayType) {
                // check for compatible array component types
                return isAssignable(lhsClass.getComponentType(), ((GenericArrayType) rhs).getGenericComponentType());
            }
        }
        // parameterized type on left
        if (lhs instanceof ParameterizedType) {
            final ParameterizedType lhsType = (ParameterizedType) lhs;
            if (rhs instanceof Class<?>) {
                final Type lhsRawType = lhsType.getRawType();
                if (lhsRawType instanceof Class<?>) {
                    return ((Class<?>) lhsRawType).isAssignableFrom((Class<?>) rhs);
                }
            } else if (rhs instanceof ParameterizedType) {
                final ParameterizedType rhsType = (ParameterizedType) rhs;
                return isParameterizedAssignable(lhsType, rhsType);
            }
        }
        // generic array type on left
        if (lhs instanceof GenericArrayType) {
            final Type lhsComponentType = ((GenericArrayType) lhs).getGenericComponentType();
            if (rhs instanceof Class<?>) {
                // raw type on right
                final Class<?> rhsClass = (Class<?>) rhs;
                if (rhsClass.isArray()) {
                    return isAssignable(lhsComponentType, rhsClass.getComponentType());
                }
            } else if (rhs instanceof GenericArrayType) {
                return isAssignable(lhsComponentType, ((GenericArrayType) rhs).getGenericComponentType());
            }
        }
        // wildcard type on left
        if (lhs instanceof WildcardType) {
            return isWildcardAssignable((WildcardType) lhs, rhs);
        }
        // strange...
        return false;
    }