// SPDX-FileCopyrightText: 2018 Stefan Majewsky <majewsky@gmx.net>
// SPDX-License-Identifier: Apache-2.0

package schwift

// FieldMetadata is a helper type that provides safe access to the metadata headers
// in a headers instance. It cannot be directly constructed, but each headers
// type has a method "Metadata" returning this type. For example:
//
//	hdr := NewObjectHeaders()
//	//the following two statements are equivalent
//	hdr["X-Object-Meta-Access"] = "strictly confidential"
//	hdr.Metadata().Set("Access", "strictly confidential")
type FieldMetadata struct {
	h Headers
	k string
}

// Clear works like Headers.Clear(), but prepends the metadata prefix to the key.
func (m FieldMetadata) Clear(key string) {
	m.h.Clear(m.k + key)
}

// Del works like Headers.Del(), but prepends the metadata prefix to the key.
func (m FieldMetadata) Del(key string) {
	m.h.Del(m.k + key)
}

// Get works like Headers.Get(), but prepends the metadata prefix to the key.
func (m FieldMetadata) Get(key string) string {
	return m.h.Get(m.k + key)
}

// Set works like Headers.Set(), but prepends the metadata prefix to the key.
func (m FieldMetadata) Set(key, value string) {
	m.h.Set(m.k+key, value)
}

func (m FieldMetadata) validate() error {
	return nil
}