store_singleton.go

// MIT License
//
// Copyright (c) 2021 Wojciech Franczyk
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package ento

import "reflect"

type SingletonStore struct {
	value reflect.Value
}

func SingletonStoreProvider(component interface{}) StoreProvider {
	return func(capacity int) Store { return NewSingletonStore(component) }
}

func NewSingletonStore(component interface{}) *SingletonStore {
	value := reflect.New(reflect.TypeOf(component))
	value.Elem().Set(reflect.ValueOf(component))
	return &SingletonStore{value: value}
}

func (s *SingletonStore) Add(_ int, _ reflect.Value) {
	// nothing to do
}

func (s *SingletonStore) Get(_ int, value reflect.Value) {
	value.Set(s.value)
}

func (s *SingletonStore) Set(_ int, _ reflect.Value) {
	// nothing to do
}

func (s *SingletonStore) Rem(_ int) {
	// nothing to do
}