You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: decode.go
    path of file: ./repos/kubeedge/vendor/sigs.k8s.io/controller-runtime/pkg/webhook/admission
    
    the code of the file until where you have to start completion: /*
Copyright 2018 The Kubernetes Authors.

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 admission

import (
	"fmt"

	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/serializer"
	"k8s.io/apimachinery/pkg/util/json"
)

// Decoder knows how to decode the contents of an admission
// request into a concrete object.
type Decoder struct {
	codecs serializer.CodecFactory
}

// NewDecoder creates a Decoder given the runtime.Scheme.
func NewDecoder(scheme *runtime.Scheme) *Decoder {
	if scheme == nil {
	
    
func (d *Decoder) DecodeRaw(rawObj runtime.RawExtension, into runtime.Object) error {
	// NB(directxman12): there's a bug/weird interaction between decoders and
	// the API server where the API server doesn't send a GVK on the embedded
	// objects, which means the unstructured decoder refuses to decode.  It
	// also means we can't pass the unstructured directly in, since it'll try
	// and call unstructured's special Unmarshal implementation, which calls
	// back into that same decoder :-/
	// See kubernetes/kubernetes#74373.

	// we error out if rawObj is an empty object.
	if len(rawObj.Raw) == 0 {
		return fmt.Errorf("there is no content to decode")
	}
	if unstructuredInto, isUnstructured := into.(runtime.Unstructured); isUnstructured {
		// unmarshal into unstructured's underlying object to avoid calling the decoder
		var object map[string]interface{}
		if err := json.Unmarshal(rawObj.Raw, &object); err != nil {
			return err
		}
		unstructuredInto.SetUnstructuredContent(object)
		return nil
	}

	deserializer := d.codecs.UniversalDeserializer()
	return runtime.DecodeInto(deserializer, rawObj.Raw, into)
}