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Diffstat (limited to 'vendor/cloud.google.com/go/internal/optional/optional.go')
-rw-r--r-- | vendor/cloud.google.com/go/internal/optional/optional.go | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/vendor/cloud.google.com/go/internal/optional/optional.go b/vendor/cloud.google.com/go/internal/optional/optional.go new file mode 100644 index 0000000..72780f7 --- /dev/null +++ b/vendor/cloud.google.com/go/internal/optional/optional.go | |||
@@ -0,0 +1,108 @@ | |||
1 | // Copyright 2016 Google LLC | ||
2 | // | ||
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | ||
4 | // you may not use this file except in compliance with the License. | ||
5 | // You may obtain a copy of the License at | ||
6 | // | ||
7 | // http://www.apache.org/licenses/LICENSE-2.0 | ||
8 | // | ||
9 | // Unless required by applicable law or agreed to in writing, software | ||
10 | // distributed under the License is distributed on an "AS IS" BASIS, | ||
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
12 | // See the License for the specific language governing permissions and | ||
13 | // limitations under the License. | ||
14 | |||
15 | // Package optional provides versions of primitive types that can | ||
16 | // be nil. These are useful in methods that update some of an API object's | ||
17 | // fields. | ||
18 | package optional | ||
19 | |||
20 | import ( | ||
21 | "fmt" | ||
22 | "strings" | ||
23 | "time" | ||
24 | ) | ||
25 | |||
26 | type ( | ||
27 | // Bool is either a bool or nil. | ||
28 | Bool interface{} | ||
29 | |||
30 | // String is either a string or nil. | ||
31 | String interface{} | ||
32 | |||
33 | // Int is either an int or nil. | ||
34 | Int interface{} | ||
35 | |||
36 | // Uint is either a uint or nil. | ||
37 | Uint interface{} | ||
38 | |||
39 | // Float64 is either a float64 or nil. | ||
40 | Float64 interface{} | ||
41 | |||
42 | // Duration is either a time.Duration or nil. | ||
43 | Duration interface{} | ||
44 | ) | ||
45 | |||
46 | // ToBool returns its argument as a bool. | ||
47 | // It panics if its argument is nil or not a bool. | ||
48 | func ToBool(v Bool) bool { | ||
49 | x, ok := v.(bool) | ||
50 | if !ok { | ||
51 | doPanic("Bool", v) | ||
52 | } | ||
53 | return x | ||
54 | } | ||
55 | |||
56 | // ToString returns its argument as a string. | ||
57 | // It panics if its argument is nil or not a string. | ||
58 | func ToString(v String) string { | ||
59 | x, ok := v.(string) | ||
60 | if !ok { | ||
61 | doPanic("String", v) | ||
62 | } | ||
63 | return x | ||
64 | } | ||
65 | |||
66 | // ToInt returns its argument as an int. | ||
67 | // It panics if its argument is nil or not an int. | ||
68 | func ToInt(v Int) int { | ||
69 | x, ok := v.(int) | ||
70 | if !ok { | ||
71 | doPanic("Int", v) | ||
72 | } | ||
73 | return x | ||
74 | } | ||
75 | |||
76 | // ToUint returns its argument as a uint. | ||
77 | // It panics if its argument is nil or not a uint. | ||
78 | func ToUint(v Uint) uint { | ||
79 | x, ok := v.(uint) | ||
80 | if !ok { | ||
81 | doPanic("Uint", v) | ||
82 | } | ||
83 | return x | ||
84 | } | ||
85 | |||
86 | // ToFloat64 returns its argument as a float64. | ||
87 | // It panics if its argument is nil or not a float64. | ||
88 | func ToFloat64(v Float64) float64 { | ||
89 | x, ok := v.(float64) | ||
90 | if !ok { | ||
91 | doPanic("Float64", v) | ||
92 | } | ||
93 | return x | ||
94 | } | ||
95 | |||
96 | // ToDuration returns its argument as a time.Duration. | ||
97 | // It panics if its argument is nil or not a time.Duration. | ||
98 | func ToDuration(v Duration) time.Duration { | ||
99 | x, ok := v.(time.Duration) | ||
100 | if !ok { | ||
101 | doPanic("Duration", v) | ||
102 | } | ||
103 | return x | ||
104 | } | ||
105 | |||
106 | func doPanic(capType string, v interface{}) { | ||
107 | panic(fmt.Sprintf("optional.%s value should be %s, got %T", capType, strings.ToLower(capType), v)) | ||
108 | } | ||