// hash generates the key for the map from either an id int64 or a code string.
// If both interfaces are nil it returns 0 which is default for website, group or store.
// fnv64a used to calculate the uint64 value of a string, especially website code and store code.
func hash(wID scope.WebsiteIDer, gID scope.GroupIDer, sID scope.StoreIDer) (uint64, error) {
uz := uint64(0)
if nil == wID && nil == gID && nil == sID {
return uz, ErrHashRetrieverNil
}
if wC, ok := wID.(scope.WebsiteCoder); ok {
return hashCode(wC.WebsiteCode()), nil
}
if nil != wID {
return uint64(wID.WebsiteID()), nil
}
if nil != gID {
return uint64(gID.GroupID()), nil
}
if sC, ok := sID.(scope.StoreCoder); ok {
return hashCode(sC.StoreCode()), nil
}
if nil != sID {
return uint64(sID.StoreID()), nil
}
return uz, ErrHashRetrieverNil // unreachable ....
}
// Group creates a new Group which contains all related stores and its website according to the
// interface definition.
func (st *Storage) Group(id scope.GroupIDer) (*Group, error) {
g, err := st.group(id)
if err != nil {
return nil, errgo.Mask(err)
}
w, err := st.website(scope.MockID(g.WebsiteID))
if err != nil {
if PkgLog.IsDebug() {
PkgLog.Debug("store.Storage.Group.website", "err", err, "websiteID", g.WebsiteID, "groupID", id.GroupID())
}
return nil, errgo.Mask(err)
}
return NewGroup(g, SetGroupConfig(st.cr), SetGroupWebsite(w), SetGroupStores(st.stores, nil))
}
// group returns a TableGroup by using a group id as argument. If no argument or more than
// one has been supplied it returns an error.
func (st *Storage) group(r scope.GroupIDer) (*TableGroup, error) {
if r == nil {
return nil, ErrGroupNotFound
}
return st.groups.FindByGroupID(r.GroupID())
}