// getRoot gets the root graph query object after parsing the args.
func getRoot(l *lex.Lexer) (gq *GraphQuery, rerr error) {
gq = &GraphQuery{
Args: make(map[string]string),
}
item := <-l.Items
if item.Typ != itemName {
return nil, x.Errorf("Expected some name. Got: %v", item)
}
gq.Alias = item.Val
item = <-l.Items
if item.Typ != itemLeftRound {
return nil, x.Errorf("Expected variable start. Got: %v", item)
}
item = <-l.Items
if item.Typ == itemGenerator {
// Store the generator function.
gen, err := parseFunction(l)
if !schema.IsIndexed(gen.Attr) {
return nil, x.Errorf(
"Field %s is not indexed and cannot be used in functions",
gen.Attr)
}
if err != nil {
return nil, err
}
gq.Func = gen
} else if item.Typ == itemArgument {
args, err := parseArguments(l)
if err != nil {
return nil, err
}
for _, p := range args {
if p.Key == "_uid_" {
gq.UID, rerr = strconv.ParseUint(p.Val, 0, 64)
if rerr != nil {
return nil, rerr
}
} else if p.Key == "_xid_" {
gq.XID = p.Val
} else {
return nil, x.Errorf("Expecting _uid_ or _xid_. Got: %+v", p)
}
}
} else {
return nil, x.Errorf("Unexpected root argument.")
}
return gq, nil
}
// AddMutationWithIndex is AddMutation with support for indexing.
func (l *List) AddMutationWithIndex(ctx context.Context, t *task.DirectedEdge, op uint32) error {
x.AssertTruef(len(t.Attr) > 0,
"[%s] [%d] [%v] %d %d\n", t.Attr, t.Entity, t.Value, t.ValueId, op)
var vbytes []byte
var vtype byte
var verr error
doUpdateIndex := pstore != nil && (t.Value != nil) &&
schema.IsIndexed(t.Attr)
if doUpdateIndex {
// Check last posting for original value BEFORE any mutation actually happens.
vbytes, vtype, verr = l.Value()
}
hasMutated, err := l.AddMutation(ctx, t, op)
if err != nil {
return err
}
if !hasMutated || !doUpdateIndex {
return nil
}
// Exact matches.
if verr == nil && len(vbytes) > 0 {
delTerm := vbytes
delType := vtype
p := types.ValueForType(types.TypeID(delType))
if err := p.UnmarshalBinary(delTerm); err != nil {
return err
}
addIndexMutations(ctx, t.Attr, t.Entity, p, true)
}
if op == Set {
p := types.ValueForType(types.TypeID(t.ValueType))
if err := p.UnmarshalBinary(t.Value); err != nil {
return err
}
addIndexMutations(ctx, t.Attr, t.Entity, p, false)
}
return nil
}