isSubclassOf method

@override bool isSubclassOf(ClassMirror other)

Returns whether the class denoted by the receiver is a subclass of the class denoted by the argument.

Note that the subclass relationship is reflexive.

Required capabilities: isSubclassOf requires a TypeRelationsCapability, and it requires that the chain of subclasses from this to other is covered.

Implementation

@override
bool isSubclassOf(ClassMirror other) {
  if (_superclassIndex == noCapabilityIndex) {
    // There are two possible reasons for this: (1) If we have no type
    // relations capability then the index will always be noCapabilityIndex.
    // (2) Even if we have the type relations capability then the superclass
    // may be un-covered. So we cannot tell the two apart based on index.
    // Note that the check for superclass access also applies to the access
    // to superinterfaces, that is, it is not necessary (nor useful) to check
    // for access to superinterfaces here.
    if (!_supportsTypeRelations(_reflector)) {
      throw NoSuchCapabilityError(
        'Attempt to evaluate `isSubclassOf` for `$qualifiedName` '
        'without `typeRelationsCapability`',
      );
    }
    throw NoSuchCapabilityError(
      'Attempt to evaluate `isSubclassOf` for $qualifiedName '
      'without capability.',
    );
  }
  return _isSubclassOf(other);
}