/
applications.go
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/
applications.go
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// Copyright 2016 IBM Corporation
//
// 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 eureka
import (
"encoding/json"
)
type appVersion struct {
VersionDelta int64 `json:"versions__delta,omitempty"`
Hashcode string `json:"apps__hashcode,omitempty"`
}
// Applications is an array of application objects
type Applications struct {
appVersion
Application []*Application `json:"application,omitempty"`
}
// UnmarshalJSON parses the JSON object of Applications struct.
// We need this specific implementation because the Eureka server
// marshals differently single application (object) and multiple applications (array).
func (apps *Applications) UnmarshalJSON(b []byte) error {
type singleApplications struct {
appVersion
Application *Application `json:"application,omitempty"`
}
type multiApplications struct {
appVersion
Application []*Application `json:"application,omitempty"`
}
var mApps multiApplications
err := json.Unmarshal(b, &mApps)
if err != nil {
// error probably means that we have a single Application object.
// Thus, we try to unmarshal to a different object type
var sApps singleApplications
err = json.Unmarshal(b, &sApps)
if err != nil {
return err
}
apps.Hashcode = sApps.Hashcode
apps.VersionDelta = sApps.VersionDelta
if sApps.Application != nil {
apps.Application = []*Application{sApps.Application}
}
return nil
}
apps.Hashcode = mApps.Hashcode
apps.VersionDelta = mApps.VersionDelta
apps.Application = mApps.Application
return nil
}