forked from TrueCloudLab/frostfs-node
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
package object
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import (
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"errors"
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)
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// Header represents NeoFS object header.
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type Header struct {
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// SystemHeader is an obligatory part of any object header.
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// It is used to set the identity and basic parameters of
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// the object.
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//
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// Header must inherit all the methods of SystemHeader,
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// so the SystemHeader is embedded in Header.
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SystemHeader
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extendedHeaders []ExtendedHeader // extended headers
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}
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// ErrNilHeader is returned by functions that expect
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// a non-nil Header pointer, but received nil.
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var ErrNilHeader = errors.New("object header is nil")
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// ExtendedHeaders returns the extended headers of header.
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//
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// Changing the result is unsafe and affects the header.
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// In order to prevent state mutations, use CopyExtendedHeaders.
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func (h *Header) ExtendedHeaders() []ExtendedHeader {
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return h.extendedHeaders
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}
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// CopyExtendedHeaders returns the copy of extended headers.
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//
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// Changing the result is safe and does not affect the header.
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//
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// Returns nil if header is nil.
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func CopyExtendedHeaders(h *Header) []ExtendedHeader {
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if h == nil {
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return nil
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}
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res := make([]ExtendedHeader, len(h.extendedHeaders))
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copy(res, h.extendedHeaders)
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return res
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}
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// SetExtendedHeaders sets the extended headers of the header.
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//
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// Subsequent changing the source slice is unsafe and affects
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// the header. In order to prevent state mutations, use
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// SetExtendedHeadersCopy.
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func (h *Header) SetExtendedHeaders(v []ExtendedHeader) {
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h.extendedHeaders = v
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}
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// SetExtendedHeadersCopy copies extended headers and sets the copy
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// as the object extended headers.
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//
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// Subsequent changing the source slice is safe and does not affect
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// the header.
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//
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// SetExtendedHeadersCopy does nothing if Header is nil.
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func SetExtendedHeadersCopy(h *Header, hs []ExtendedHeader) {
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if h == nil {
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return
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}
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h.extendedHeaders = make([]ExtendedHeader, len(hs))
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copy(h.extendedHeaders, hs)
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}
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