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json.go
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json.go
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/*
Copyright 2017 The Nuclio 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 restful
import (
"encoding/json"
"net/http"
)
//
// Encoder
//
type jsonEncoder struct {
jsonEncoder *json.Encoder
responseWriter http.ResponseWriter
resourceType string
}
// encode a single resource
func (je *jsonEncoder) EncodeResource(resourceID string, resourceAttributes Attributes) {
resourceAttributes["id"] = resourceID
je.setContentType()
je.jsonEncoder.Encode(&resourceAttributes)
}
// encode multiple resources
func (je *jsonEncoder) EncodeResources(resources map[string]Attributes) {
resourceIDList := []string{}
// if attributes is nil, we return a list
for resourceID, resourceAttributes := range resources {
// if there's attributes, don't return as a list
if resourceAttributes != nil {
break
}
resourceIDList = append(resourceIDList, resourceID)
}
je.setContentType()
// if we populated a list, return it as a simple list, otherwise as a map
if len(resourceIDList) != 0 {
je.jsonEncoder.Encode(&resourceIDList)
} else {
je.jsonEncoder.Encode(&resources)
}
}
func (je *jsonEncoder) setContentType() {
je.responseWriter.Header().Set("Content-Type", "application/json")
}
//
// Factory
//
type JSONEncoderFactory struct{}
func (jef *JSONEncoderFactory) NewEncoder(responseWriter http.ResponseWriter, resourceType string) Encoder {
return &jsonEncoder{
jsonEncoder: json.NewEncoder(responseWriter),
responseWriter: responseWriter,
resourceType: resourceType,
}
}