from zope.interface import Interface


class ILinkIntegrityNotificationException(Interface):
    """ an exception indicating a prevented link integrity breach """


class ILinkIntegrityTool(Interface):
    """ interface of link integrity tool """


class ILinkIntegrityInfo(Interface):
    """ a place to store information about link integrity, i.e. breaches;
        the storage is assumed to be unique per browser request """

    def addBreach(source, target):
        """ add information about an integrity breach, i.e. an indicator
            that `source` object somehow references `target` """

    def getIntegrityBreaches():
        """ return stored information regarding link integrity breaches """

    def setIntegrityBreaches(breaches):
        """ store information regarding link integrity breaches """

    def getDeletedItems():
        """ return information about all items deleted during the request """

    def addDeletedItem(item):
        """ remember an item deleted during the request """

    def getEnvMarker():
        """ return the marker string used to pass the already confirmed
            items across the retry exception """

    def isConfirmedItem(obj):
        """ indicate if the removal of the given object was confirmed """

    def encodeConfirmedItems(additions):
        """ return the list of previously confirmed (for removeal) items,
            optionally adding the given items, encoded for usage in a form """


class IOFSImage(Interface):
    """ interface for OFS.Image.Image """