1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// Copyright 2016 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package datastore
import "golang.org/x/net/context"
// Datastore kinds for the metadata entities.
const (
namespaceKind = "__namespace__"
kindKind = "__kind__"
propertyKind = "__property__"
)
// Namespaces returns all the datastore namespaces.
func Namespaces(ctx context.Context) ([]string, error) {
// TODO(djd): Support range queries.
q := NewQuery(namespaceKind).KeysOnly()
keys, err := q.GetAll(ctx, nil)
if err != nil {
return nil, err
}
// The empty namespace key uses a numeric ID (==1), but luckily
// the string ID defaults to "" for numeric IDs anyway.
return keyNames(keys), nil
}
// Kinds returns the names of all the kinds in the current namespace.
func Kinds(ctx context.Context) ([]string, error) {
// TODO(djd): Support range queries.
q := NewQuery(kindKind).KeysOnly()
keys, err := q.GetAll(ctx, nil)
if err != nil {
return nil, err
}
return keyNames(keys), nil
}
// keyNames returns a slice of the provided keys' names (string IDs).
func keyNames(keys []*Key) []string {
n := make([]string, 0, len(keys))
for _, k := range keys {
n = append(n, k.StringID())
}
return n
}
// KindProperties returns all the indexed properties for the given kind.
// The properties are returned as a map of property names to a slice of the
// representation types. The representation types for the supported Go property
// types are:
// "INT64": signed integers and time.Time
// "DOUBLE": float32 and float64
// "BOOLEAN": bool
// "STRING": string, []byte and ByteString
// "POINT": appengine.GeoPoint
// "REFERENCE": *Key
// "USER": (not used in the Go runtime)
func KindProperties(ctx context.Context, kind string) (map[string][]string, error) {
// TODO(djd): Support range queries.
kindKey := NewKey(ctx, kindKind, kind, 0, nil)
q := NewQuery(propertyKind).Ancestor(kindKey)
propMap := map[string][]string{}
props := []struct {
Repr []string `datastore:property_representation`
}{}
keys, err := q.GetAll(ctx, &props)
if err != nil {
return nil, err
}
for i, p := range props {
propMap[keys[i].StringID()] = p.Repr
}
return propMap, nil
}
|
