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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 constraint
import (
"encoding/json"
"fmt"
)
type OperatorType int
const (
UniqueOperator OperatorType = iota
LikeOperator
ClusterOperator
GroupByOperator
UnlikeOperator
)
var (
labels = []string{
"UNIQUE",
"LIKE",
"CLUSTER",
"GROUP_BY",
"UNLIKE",
}
labelToType map[string]OperatorType
)
func init() {
labelToType = make(map[string]OperatorType)
for i, s := range labels {
labelToType[s] = OperatorType(i)
}
}
func (t OperatorType) String() string {
switch t {
case UniqueOperator, LikeOperator, ClusterOperator, GroupByOperator, UnlikeOperator:
return labels[int(t)]
default:
panic(fmt.Sprintf("unrecognized operator type: %d", int(t)))
}
}
func parseOperatorType(s string) (OperatorType, error) {
t, found := labelToType[s]
if !found {
return UniqueOperator, fmt.Errorf("unrecognized operator %q", s)
}
return t, nil
}
type Constraint struct {
Field string // required
Operator OperatorType // required
Value string // optional
}
func (c *Constraint) MarshalJSON() ([]byte, error) {
var a []string
if c != nil {
if c.Value != "" {
a = append(a, c.Field, c.Operator.String(), c.Value)
} else {
a = append(a, c.Field, c.Operator.String())
}
}
return json.Marshal(a)
}
func (c *Constraint) UnmarshalJSON(buf []byte) (err error) {
var a []string
if err = json.Unmarshal(buf, &a); err != nil {
return err
}
switch x := len(a); {
case x < 2:
err = fmt.Errorf("not enough arguments to form constraint")
case x > 3:
err = fmt.Errorf("too many arguments to form constraint")
case x == 3:
c.Value = a[2]
fallthrough
case x == 2:
c.Field = a[0]
c.Operator, err = parseOperatorType(a[1])
}
return err
}
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