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util.go
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util.go
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// SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Open Component Model contributors.
//
// SPDX-License-Identifier: Apache-2.0
package datacontext
import (
"context"
"fmt"
)
// ForContextByKey retrieves the context for a given key to be used for a context.Context.
// If not defined, it returns the given default context and false.
func ForContextByKey(ctx context.Context, key interface{}, def Context) (Context, bool) {
c := ctx.Value(key)
if c == nil {
return def, false
}
return c.(Context), true
}
type ElementCopyable[T any] interface {
comparable
Copy() T
}
type ElementCreator[T any] func(base ...T) T
func SetupElement[T ElementCopyable[T]](mode BuilderMode, target *T, create ElementCreator[T], def T) error {
var zero T
if *target == zero {
switch mode {
case MODE_INITIAL:
*target = create()
case MODE_CONFIGURED:
*target = def.Copy()
case MODE_EXTENDED:
*target = create(def)
case MODE_DEFAULTED:
fallthrough
case MODE_SHARED:
*target = def
default:
return fmt.Errorf("invalid context creation mode %s", mode)
}
}
return nil
}