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value.go
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value.go
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/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* 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 condition
import (
"encoding/json"
"fmt"
"reflect"
"strconv"
"strings"
)
// Splits an incoming path into bucket and object components.
func path2BucketAndObject(path string) (bucket, object string) {
// Skip the first element if it is '/', split the rest.
path = strings.TrimPrefix(path, "/")
pathComponents := strings.SplitN(path, "/", 2)
// Save the bucket and object extracted from path.
switch len(pathComponents) {
case 1:
bucket = pathComponents[0]
case 2:
bucket = pathComponents[0]
object = pathComponents[1]
}
return bucket, object
}
// Value - is enum type of string, int or bool.
type Value struct {
t reflect.Kind
s string
i int
b bool
}
// GetBool - gets stored bool value.
func (v Value) GetBool() (bool, error) {
var err error
if v.t != reflect.Bool {
err = fmt.Errorf("not a bool Value")
}
return v.b, err
}
// GetInt - gets stored int value.
func (v Value) GetInt() (int, error) {
var err error
if v.t != reflect.Int {
err = fmt.Errorf("not a int Value")
}
return v.i, err
}
// GetString - gets stored string value.
func (v Value) GetString() (string, error) {
var err error
if v.t != reflect.String {
err = fmt.Errorf("not a string Value")
}
return v.s, err
}
// GetType - gets enum type.
func (v Value) GetType() reflect.Kind {
return v.t
}
// MarshalJSON - encodes Value to JSON data.
func (v Value) MarshalJSON() ([]byte, error) {
switch v.t {
case reflect.String:
return json.Marshal(v.s)
case reflect.Int:
return json.Marshal(v.i)
case reflect.Bool:
return json.Marshal(v.b)
}
return nil, fmt.Errorf("unknown value kind %v", v.t)
}
// StoreBool - stores bool value.
func (v *Value) StoreBool(b bool) {
*v = Value{t: reflect.Bool, b: b}
}
// StoreInt - stores int value.
func (v *Value) StoreInt(i int) {
*v = Value{t: reflect.Int, i: i}
}
// StoreString - stores string value.
func (v *Value) StoreString(s string) {
*v = Value{t: reflect.String, s: s}
}
// String - returns string representation of value.
func (v Value) String() string {
switch v.t {
case reflect.String:
return v.s
case reflect.Int:
return strconv.Itoa(v.i)
case reflect.Bool:
return strconv.FormatBool(v.b)
}
return ""
}
// UnmarshalJSON - decodes JSON data.
func (v *Value) UnmarshalJSON(data []byte) error {
var b bool
if err := json.Unmarshal(data, &b); err == nil {
v.StoreBool(b)
return nil
}
var i int
if err := json.Unmarshal(data, &i); err == nil {
v.StoreInt(i)
return nil
}
var s string
if err := json.Unmarshal(data, &s); err == nil {
v.StoreString(s)
return nil
}
return fmt.Errorf("unknown json data '%v'", data)
}
// NewBoolValue - returns new bool value.
func NewBoolValue(b bool) Value {
value := &Value{}
value.StoreBool(b)
return *value
}
// NewIntValue - returns new int value.
func NewIntValue(i int) Value {
value := &Value{}
value.StoreInt(i)
return *value
}
// NewStringValue - returns new string value.
func NewStringValue(s string) Value {
value := &Value{}
value.StoreString(s)
return *value
}