[#164] sdk/object: Define filters to search virtual objects

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

pkg/object/search.go

@@ -110,3 +110,15 @@ func (f *SearchFilters) AddRootFilter() {
 func (f *SearchFilters) AddNonRootFilter() {
 	f.addRootFilter(ValNonRoot)
 }
+
+func (f *SearchFilters) addLeafFilter(val string) {
+	f.AddFilter(KeyLeaf, val, MatchStringEqual)
+}
+
+func (f *SearchFilters) AddLeafFilter() {
+	f.addLeafFilter(ValLeaf)
+}
+
+func (f *SearchFilters) AddNonLeafFilter() {
+	f.addLeafFilter(ValNonLeaf)
+}

pkg/object/search_test.go

@@ -79,3 +79,31 @@ func TestSearchFilters_AddNonRootFilter(t *testing.T) {
 	require.Equal(t, object.KeyRoot, f.Header())
 	require.Equal(t, object.ValNonRoot, f.Value())
 }
+
+func TestSearchFilters_AddLeafFilter(t *testing.T) {
+	fs := new(object.SearchFilters)
+
+	fs.AddLeafFilter()
+
+	require.Len(t, *fs, 1)
+
+	f := (*fs)[0]
+
+	require.Equal(t, object.MatchStringEqual, f.Operation())
+	require.Equal(t, object.KeyLeaf, f.Header())
+	require.Equal(t, object.ValLeaf, f.Value())
+}
+
+func TestSearchFilters_AddNonLeafFilter(t *testing.T) {
+	fs := new(object.SearchFilters)
+
+	fs.AddNonLeafFilter()
+
+	require.Len(t, *fs, 1)
+
+	f := (*fs)[0]
+
+	require.Equal(t, object.MatchStringEqual, f.Operation())
+	require.Equal(t, object.KeyLeaf, f.Header())
+	require.Equal(t, object.ValNonLeaf, f.Value())
+}

pkg/object/wellknown_filters.go

@@ -18,3 +18,14 @@ const (
 	// ValNonRoot is a value of non-root object filter.
 	ValNonRoot = valFalse
 )
+
+const (
+	// KeyLeaf is a reserved search filter key to physically stored objects.
+	KeyLeaf = ReservedFilterPrefix + "LEAF"
+
+	// ValLeaf is a value of physically stored object filter.
+	ValLeaf = valTrue
+
+	// ValNonLeaf is a value of virtual object filter.
+	ValNonLeaf = valFalse
+)