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type_assert.go
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/
type_assert.go
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package mapx
import (
"encoding/json"
"errors"
"fmt"
"time"
)
// ErrKeyDoesNotExist is returned when the key does not exist in the map.
var ErrKeyDoesNotExist = errors.New("key is not present in map")
// ErrKeyCanNotBeTypeAsserted is returned when the key can not be type asserted.
var ErrKeyCanNotBeTypeAsserted = errors.New("key could not be type asserted")
// GetString returns a string for a given key in values.
func GetString(values map[interface{}]interface{}, key interface{}) (string, error) {
if v, ok := values[key]; !ok {
return "", ErrKeyDoesNotExist
} else if sv, ok := v.(string); !ok {
return "", ErrKeyCanNotBeTypeAsserted
} else {
return sv, nil
}
}
// GetStringSlice returns a string slice for a given key in values.
func GetStringSlice(values map[interface{}]interface{}, key interface{}) ([]string, error) {
if v, ok := values[key]; !ok {
return []string{}, ErrKeyDoesNotExist
} else if sv, ok := v.([]string); ok {
return sv, nil
} else if sv, ok := v.([]interface{}); ok {
vs := make([]string, len(sv))
for k, v := range sv {
vv, ok := v.(string)
if !ok {
return []string{}, ErrKeyCanNotBeTypeAsserted
}
vs[k] = vv
}
return vs, nil
}
return []string{}, ErrKeyCanNotBeTypeAsserted
}
// GetTime returns a string slice for a given key in values.
func GetTime(values map[interface{}]interface{}, key interface{}) (time.Time, error) {
v, ok := values[key]
if !ok {
return time.Time{}, ErrKeyDoesNotExist
}
if sv, ok := v.(time.Time); ok {
return sv, nil
} else if sv, ok := v.(int64); ok {
return time.Unix(sv, 0), nil
} else if sv, ok := v.(int32); ok {
return time.Unix(int64(sv), 0), nil
} else if sv, ok := v.(int); ok {
return time.Unix(int64(sv), 0), nil
} else if sv, ok := v.(float64); ok {
return time.Unix(int64(sv), 0), nil
} else if sv, ok := v.(float32); ok {
return time.Unix(int64(sv), 0), nil
}
return time.Time{}, ErrKeyCanNotBeTypeAsserted
}
// GetInt64Default returns a int64 or the default value for a given key in values.
func GetInt64Default(values map[interface{}]interface{}, key interface{}, defaultValue int64) int64 {
f, err := GetInt64(values, key)
if err != nil {
return defaultValue
}
return f
}
// GetInt64 returns an int64 for a given key in values.
func GetInt64(values map[interface{}]interface{}, key interface{}) (int64, error) {
if v, ok := values[key]; !ok {
return 0, ErrKeyDoesNotExist
} else if j, ok := v.(json.Number); ok {
return j.Int64()
} else if sv, ok := v.(int64); ok {
return sv, nil
}
return 0, ErrKeyCanNotBeTypeAsserted
}
// GetInt32Default returns a int32 or the default value for a given key in values.
func GetInt32Default(values map[interface{}]interface{}, key interface{}, defaultValue int32) int32 {
f, err := GetInt32(values, key)
if err != nil {
return defaultValue
}
return f
}
// GetInt32 returns an int32 for a given key in values.
func GetInt32(values map[interface{}]interface{}, key interface{}) (int32, error) {
if v, ok := values[key]; !ok {
return 0, ErrKeyDoesNotExist
} else if sv, ok := v.(int32); ok {
return sv, nil
} else if sv, ok := v.(int); ok {
return int32(sv), nil
} else if j, ok := v.(json.Number); ok {
v, err := j.Int64()
return int32(v), err
}
return 0, ErrKeyCanNotBeTypeAsserted
}
// GetIntDefault returns a int or the default value for a given key in values.
func GetIntDefault(values map[interface{}]interface{}, key interface{}, defaultValue int) int {
f, err := GetInt(values, key)
if err != nil {
return defaultValue
}
return f
}
// GetInt returns an int for a given key in values.
func GetInt(values map[interface{}]interface{}, key interface{}) (int, error) {
if v, ok := values[key]; !ok {
return 0, ErrKeyDoesNotExist
} else if sv, ok := v.(int32); ok {
return int(sv), nil
} else if sv, ok := v.(int); ok {
return sv, nil
} else if j, ok := v.(json.Number); ok {
v, err := j.Int64()
return int(v), err
}
return 0, ErrKeyCanNotBeTypeAsserted
}
// GetFloat32Default returns a float32 or the default value for a given key in values.
func GetFloat32Default(values map[interface{}]interface{}, key interface{}, defaultValue float32) float32 {
f, err := GetFloat32(values, key)
if err != nil {
return defaultValue
}
return f
}
// GetFloat32 returns a float32 for a given key in values.
func GetFloat32(values map[interface{}]interface{}, key interface{}) (float32, error) {
if v, ok := values[key]; !ok {
return 0, ErrKeyDoesNotExist
} else if j, ok := v.(json.Number); ok {
v, err := j.Float64()
return float32(v), err
} else if sv, ok := v.(float32); ok {
return sv, nil
}
return 0, ErrKeyCanNotBeTypeAsserted
}
// GetFloat64Default returns a float64 or the default value for a given key in values.
func GetFloat64Default(values map[interface{}]interface{}, key interface{}, defaultValue float64) float64 {
f, err := GetFloat64(values, key)
if err != nil {
return defaultValue
}
return f
}
// GetFloat64 returns a float64 for a given key in values.
func GetFloat64(values map[interface{}]interface{}, key interface{}) (float64, error) {
if v, ok := values[key]; !ok {
return 0, ErrKeyDoesNotExist
} else if j, ok := v.(json.Number); ok {
return j.Float64()
} else if sv, ok := v.(float64); ok {
return sv, nil
}
return 0, ErrKeyCanNotBeTypeAsserted
}
// GetStringDefault returns a string or the default value for a given key in values.
func GetStringDefault(values map[interface{}]interface{}, key interface{}, defaultValue string) string {
if s, err := GetString(values, key); err == nil {
return s
}
return defaultValue
}
// GetStringSliceDefault returns a string slice or the default value for a given key in values.
func GetStringSliceDefault(values map[interface{}]interface{}, key interface{}, defaultValue []string) []string {
if s, err := GetStringSlice(values, key); err == nil {
return s
}
return defaultValue
}
// KeyStringToInterface converts map[string]interface{} to map[interface{}]interface{}
func KeyStringToInterface(i map[string]interface{}) map[interface{}]interface{} {
o := make(map[interface{}]interface{})
for k, v := range i {
o[k] = v
}
return o
}
// ToJSONMap converts all map[interface{}]interface{} occurrences (nested as well) to map[string]interface{}.
func ToJSONMap(i interface{}) interface{} {
switch t := i.(type) {
case []interface{}:
for k, v := range t {
t[k] = ToJSONMap(v)
}
return t
case map[string]interface{}:
for k, v := range t {
t[k] = ToJSONMap(v)
}
return t
case map[interface{}]interface{}:
res := make(map[string]interface{})
for k, v := range t {
res[fmt.Sprintf("%s", k)] = ToJSONMap(v)
}
return res
}
return i
}