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package json
import (
"fmt"
"gopkg.in/mgo.v2/bson"
"reflect"
)
// Transition functions for recognizing DBPointer.
// Adapted from encoding/json/scanner.go.
// stateDB is the state after reading `DB`.
func stateDBP(s *scanner, c int) int {
if c == 'o' {
s.step = generateState("DBPointer", []byte("inter"), stateConstructor)
return scanContinue
}
return s.error(c, "in literal DBPointer (expecting 'o')")
}
// Decodes a DBRef literal stored in the underlying byte data into v.
func (d *decodeState) storeDBPointer(v reflect.Value) {
op := d.scanWhile(scanSkipSpace)
if op != scanBeginCtor {
d.error(fmt.Errorf("expected beginning of constructor"))
}
args := d.ctorInterface()
if len(args) != 2 {
d.error(fmt.Errorf("expected 2 arguments to DBPointer constructor, but %v received", len(args)))
}
switch kind := v.Kind(); kind {
case reflect.Interface:
arg0, ok := args[0].(string)
if !ok {
d.error(fmt.Errorf("expected first argument to DBPointer to be of type string"))
}
arg1, ok := args[1].(ObjectId)
if !ok {
d.error(fmt.Errorf("expected second argument to DBPointer to be of type ObjectId, but ended up being %t", args[1]))
}
id := bson.ObjectIdHex(string(arg1))
v.Set(reflect.ValueOf(DBPointer{arg0, id}))
default:
d.error(fmt.Errorf("cannot store %v value into %v type", dbPointerType, kind))
}
}
// Returns a DBRef literal from the underlying byte data.
func (d *decodeState) getDBPointer() interface{} {
op := d.scanWhile(scanSkipSpace)
if op != scanBeginCtor {
d.error(fmt.Errorf("expected beginning of constructor"))
}
args := d.ctorInterface()
if err := ctorNumArgsMismatch("DBPointer", 2, len(args)); err != nil {
d.error(err)
}
arg0, ok := args[0].(string)
if !ok {
d.error(fmt.Errorf("expected string for first argument of DBPointer constructor"))
}
arg1, ok := args[1].(ObjectId)
if !ok {
d.error(fmt.Errorf("expected ObjectId for second argument of DBPointer constructor"))
}
id := bson.ObjectIdHex(string(arg1))
return DBPointer{arg0, id}
}
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