mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-29 09:12:10 -05:00
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
|
// Copyright 2024 The Hugo Authors. 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 hcontext
|
||
|
|
|
||
|
|
import "context"
|
||
|
|
|
||
|
|
// ContextDispatcher is a generic interface for setting and getting values from a context.
|
||
|
|
type ContextDispatcher[T any] interface {
|
||
|
|
Set(ctx context.Context, value T) context.Context
|
||
|
|
Get(ctx context.Context) T
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewContextDispatcher creates a new ContextDispatcher with the given key.
|
||
|
|
func NewContextDispatcher[T any, R comparable](key R) ContextDispatcher[T] {
|
||
|
|
return keyInContext[T, R]{
|
||
|
|
id: key,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
type keyInContext[T any, R comparable] struct {
|
||
|
|
zero T
|
||
|
|
id R
|
||
|
|
}
|
||
|
|
|
||
|
|
func (f keyInContext[T, R]) Get(ctx context.Context) T {
|
||
|
|
v := ctx.Value(f.id)
|
||
|
|
if v == nil {
|
||
|
|
return f.zero
|
||
|
|
}
|
||
|
|
return v.(T)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (f keyInContext[T, R]) Set(ctx context.Context, value T) context.Context {
|
||
|
|
return context.WithValue(ctx, f.id, value)
|
||
|
|
}
|