[#189] sdk/netmap: Refactor Selector type

Replace alias to v2 type Selector with v2-compatible implementation.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/netmap/selector.go

@@ -8,6 +8,9 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/v2/netmap"
 )
 
+// Selector represents v2-compatible netmap selector.
+type Selector netmap.Selector
+
 // processSelectors processes selectors and returns error is any of them is invalid.
 func (c *Context) processSelectors(p *netmap.PlacementPolicy) error {
 	for _, s := range p.GetSelectors() {
@@ -118,3 +121,80 @@ func (c *Context) getSelectionBase(s *netmap.Selector) []nodeAttrPair {
 	}
 	return result
 }
+
+// NewSelector creates and returns new Selector instance.
+func NewSelector() *Selector {
+	return NewSelectorFromV2(new(netmap.Selector))
+}
+
+// NewSelectorFromV2 converts v2 Selector to Selector.
+func NewSelectorFromV2(f *netmap.Selector) *Selector {
+	return (*Selector)(f)
+}
+
+// ToV2 converts Selector to v2 Selector.
+func (s *Selector) ToV2() *netmap.Selector {
+	return (*netmap.Selector)(s)
+}
+
+// Name returns selector name.
+func (s *Selector) Name() string {
+	return (*netmap.Selector)(s).
+		GetName()
+}
+
+// SetName sets selector name.
+func (s *Selector) SetName(name string) {
+	(*netmap.Selector)(s).
+		SetName(name)
+}
+
+// Count returns count of nodes to select from bucket.
+func (s *Selector) Count() uint32 {
+	return (*netmap.Selector)(s).
+		GetCount()
+}
+
+// SetCount sets count of nodes to select from bucket.
+func (s *Selector) SetCount(c uint32) {
+	(*netmap.Selector)(s).
+		SetCount(c)
+}
+
+// Clause returns modifier showing how to form a bucket.
+func (s *Selector) Clause() Clause {
+	return ClauseFromV2(
+		(*netmap.Selector)(s).
+			GetClause(),
+	)
+}
+
+// SetClause sets modifier showing how to form a bucket.
+func (s *Selector) SetClause(c Clause) {
+	(*netmap.Selector)(s).
+		SetClause(c.ToV2())
+}
+
+// Attribute returns attribute bucket to select from.
+func (s *Selector) Attribute() string {
+	return (*netmap.Selector)(s).
+		GetAttribute()
+}
+
+// SetAttribute sets attribute bucket to select from.
+func (s *Selector) SetAttribute(a string) {
+	(*netmap.Selector)(s).
+		SetAttribute(a)
+}
+
+// Filter returns filter reference to select from.
+func (s *Selector) Filter() string {
+	return (*netmap.Selector)(s).
+		GetFilter()
+}
+
+// SetFilter sets filter reference to select from.
+func (s *Selector) SetFilter(f string) {
+	(*netmap.Selector)(s).
+		SetFilter(f)
+}