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field_mask.go
56 lines (50 loc) · 1.62 KB
/
field_mask.go
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// Copyright © 2022 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package store
import "strings"
// FieldMask is used to specify applicable fields in SELECT or UPDATE queries.
type FieldMask []string
// Contains returns true if the given field is present in the field mask.
func (fm FieldMask) Contains(search string) bool {
for _, f := range fm {
if f == search {
return true
}
}
return false
}
// TopLevel returns the top-level fields from the field mask.
func (fm FieldMask) TopLevel() FieldMask {
out := make(FieldMask, 0, len(fm))
for _, f := range fm {
before, _, _ := strings.Cut(f, ".")
if !out.Contains(before) {
out = append(out, before)
}
}
return out
}
// TrimPrefix returns a field mask with all fields of fm that contain prefix, but then having that prefix removed.
func (fm FieldMask) TrimPrefix(prefix string) FieldMask {
if !strings.HasSuffix(prefix, ".") {
prefix += "."
}
out := make([]string, 0, len(fm))
for _, f := range fm {
if strings.HasPrefix(f, prefix) {
out = append(out, strings.TrimPrefix(f, prefix))
}
}
return out
}