error.go

/*
Copyright 2014 Google Inc. 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 conversion

import (
	"fmt"
	"reflect"
)

type notRegisteredErr struct {
	kind    string
	version string
	t       reflect.Type
}

func (k *notRegisteredErr) Error() string {
	if k.t != nil {
		return fmt.Sprintf("no kind is registered for the type %v", k.t)
	}
	if len(k.kind) == 0 {
		return fmt.Sprintf("no version %q has been registered", k.version)
	}
	if len(k.version) == 0 {
		return fmt.Sprintf("no kind %q is registered for the default version", k.kind)
	}
	return fmt.Sprintf("no kind %q is registered for version %q", k.kind, k.version)
}

// IsNotRegisteredError returns true if the error indicates the provided
// object or input data is not registered.
func IsNotRegisteredError(err error) bool {
	if err == nil {
		return false
	}
	_, ok := err.(*notRegisteredErr)
	return ok
}