private static bool AreSameNamespace(Modification modification, Dependency dependency)
{
string modificationNamespace;
if (modification is NamespaceModification)
{
modificationNamespace = ((NamespaceModification)modification).Namespace;
}
else if (modification is TopicModification)
{
modificationNamespace = ((TopicModification)modification).Topic.Namespace;
}
else
{
throw new ArgumentException("Unrecognized modification type: " + modification.GetType().ToString());
}
string dependencyNamespace;
if (dependency is NamespaceDependency)
{
dependencyNamespace = ((NamespaceDependency)dependency).Namespace;
}
else if (dependency is TopicDependency)
{
dependencyNamespace = ((TopicDependency)dependency).TopicName.Namespace;
}
else
{
throw new ArgumentException("Unrecognized dependency type: " + dependency.GetType().ToString());
}
return modificationNamespace.Equals(dependencyNamespace, StringComparison.InvariantCultureIgnoreCase);
}
internal static bool Invalidates(Modification modification, Dependency dependency)
{
if (modification == null)
{
throw new ArgumentNullException("Modification may not be null.");
}
if (dependency == null)
{
throw new ArgumentNullException("Dependency may not be null.");
}
// Dependencies:
// NamespaceDependency:
// NamespaceExistenceDependency
// NamespacePermissionsDependency
// NamespacePropertiesDependency
// TopicListDependency
// TopicDependency:
// TopicContentsDependency
// TopicExistenceDependency
// TopicPermissionsDependency
// Modifications:
// NamespaceModification:
// NamespaceContentsDeletedModification
// NamespacePermissionsModification
// NamespacePropertiesModification
// TopicListModification
// TopicModification:
// TopicContentsModification
// TopicDeletedModification
// TopicPermissionsModification
if (!AreSameNamespace(modification, dependency))
{
return false;
}
if (modification is NamespaceContentsDeletedModification)
{
return true;
}
else if (modification is NamespacePermissionsModification)
{
// If the namespace permissions have changed, then it's
// possible that the user no longer has any access to the
// contents of this namespace. So we flush everything.
return true;
}
else if (modification is NamespacePropertiesModification)
{
return dependency is NamespacePropertiesDependency;
}
else if (modification is TopicListModification)
{
return true;
}
else if (modification is TopicContentsModification)
{
// Might be a modification, but then again it could be a write of a new topic
return AreSameTopic(modification, dependency) || dependency is TopicListDependency;
}
else if (modification is TopicDeletedModification)
{
return AreSameTopic(modification, dependency) || dependency is TopicListDependency;
}
else if (modification is TopicPermissionsModification)
{
return AreSameTopic(modification, dependency);
}
else
{
throw new ArgumentException("Unrecognized modification type: " + modification.GetType().ToString());
}
}