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package server
import (
"errors"
"fmt"
)
type automap map[string]interface{}
var errExists = errors.New("already exists")
var errNotFound = errors.New("no such entry")
func (m automap) next() string {
for n := 1; ; n++ {
k := fmt.Sprintf("%d", n)
if _, ok := m[k]; !ok {
return k
}
}
}
func (m automap) add(v interface{}) string {
k := m.next()
m[k] = v
return k
}
func (m automap) rename(old string, new string) (interface{}, error) {
if _, ok := m[old]; !ok {
return nil, errNotFound
}
if _, ok := m[new]; ok {
return nil, errExists
}
v := m[old]
m[new] = v
delete(m, old)
return v, nil
}
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