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109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
/*
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Copyright 2017 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package spanner
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import (
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proto3 "github.com/golang/protobuf/ptypes/struct"
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sppb "google.golang.org/genproto/googleapis/spanner/v1"
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)
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// A KeySet defines a collection of Cloud Spanner keys and/or key
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// ranges. All the keys are expected to be in the same table or index. The keys
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// need not be sorted in any particular way.
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//
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// If the same key is specified multiple times in the set (for example if two
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// ranges, two keys, or a key and a range overlap), the Cloud Spanner backend behaves
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// as if the key were only specified once.
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type KeySet struct {
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// If All == true, then the KeySet names all rows of a table or
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// under a index.
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All bool
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// Keys is a list of keys covered by KeySet, see also documentation of
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// Key for details.
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Keys []Key
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// Ranges is a list of key ranges covered by KeySet, see also documentation of
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// KeyRange for details.
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Ranges []KeyRange
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}
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// AllKeys returns a KeySet that represents all Keys of a table or a index.
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func AllKeys() KeySet {
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return KeySet{All: true}
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}
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// Keys returns a KeySet for a set of keys.
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func Keys(keys ...Key) KeySet {
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ks := KeySet{Keys: make([]Key, len(keys))}
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copy(ks.Keys, keys)
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return ks
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}
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// Range returns a KeySet for a range of keys.
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func Range(r KeyRange) KeySet {
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return KeySet{Ranges: []KeyRange{r}}
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}
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// PrefixRange returns a KeySet for all keys with the given prefix, which is
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// a key itself.
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func PrefixRange(prefix Key) KeySet {
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return KeySet{Ranges: []KeyRange{
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{
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Start: prefix,
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End: prefix,
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Kind: ClosedClosed,
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},
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}}
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}
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// UnionKeySets unions multiple KeySets into a superset.
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func UnionKeySets(keySets ...KeySet) KeySet {
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s := KeySet{}
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for _, ks := range keySets {
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if ks.All {
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return KeySet{All: true}
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}
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s.Keys = append(s.Keys, ks.Keys...)
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s.Ranges = append(s.Ranges, ks.Ranges...)
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}
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return s
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}
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// proto converts KeySet into sppb.KeySet, which is the protobuf
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// representation of KeySet.
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func (keys KeySet) proto() (*sppb.KeySet, error) {
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pb := &sppb.KeySet{
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Keys: make([]*proto3.ListValue, 0, len(keys.Keys)),
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Ranges: make([]*sppb.KeyRange, 0, len(keys.Ranges)),
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All: keys.All,
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}
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for _, key := range keys.Keys {
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keyProto, err := key.proto()
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if err != nil {
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return nil, err
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}
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pb.Keys = append(pb.Keys, keyProto)
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}
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for _, r := range keys.Ranges {
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rProto, err := r.proto()
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if err != nil {
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return nil, err
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}
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pb.Ranges = append(pb.Ranges, rProto)
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}
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return pb, nil
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}
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