active/core/vals/scope.go

// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  scope.go
//   Created by DEV
//   Modified   19/03/2024
//
//   Copyright 2024 activething.com
// ------------------------------------------------------------------------
// 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 vals

import "sync"

type (
	Scope struct {
		ScopeAtt
		parent KeyValueGetter
		values sync.Map
	}

	ScopeFnc func(*Scope)
)

func NewScope(options ...ScopeFnc) *Scope {
	return applyScopeOptions(&Scope{}, options...)
}

func (s *Scope) GetValue(key any) (any, bool) {
	if key == nil {
		return nil, false
	}
	v, h := s.values.Load(key)
	if !h {
		v, h = s.parent.GetValue(key)
	}
	if h {
		return AsValue(v), true
	}
	return nil, false
}

func (s *Scope) SetValue(key any, value any) error {
	if key == nil {
		//todo error
	}
	if s.IsReadOnly() {
		//todo error
	}
	s.values.Store(key, AsValuer(value))
	return nil
}