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from .version_constraint import VersionConstraint


class EmptyConstraint(VersionConstraint):
    def is_empty(self):
        return True

    def is_any(self):
        return False

    def allows(self, version):
        return False

    def allows_all(self, other):
        return other.is_empty()

    def allows_any(self, other):
        return False

    def intersect(self, other):
        return self

    def union(self, other):
        return other

    def difference(self, other):
        return self

    def __str__(self):
        return "<empty>"