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segment.go
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segment.go
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package segment
import (
"bytes"
"fmt"
"reflect"
"strings"
"github.com/mitch000001/go-hbci/element"
)
const (
senderBank = "I"
senderUser = "K"
senderBoth = "K/I"
)
type Segment interface {
Header() *element.SegmentHeader
SetPosition(func() int)
String() string
}
type ClientSegment interface {
Segment
Marshaler
}
type BankSegment interface {
Segment
Unmarshaler
}
type CommonSegment interface {
Segment
Marshaler
Unmarshaler
}
type basicSegment interface {
Version() int
ID() string
referencedId() string
sender() string
elements() []element.DataElement
}
type Marshaler interface {
MarshalHBCI() ([]byte, error)
}
type Unmarshaler interface {
UnmarshalHBCI([]byte) error
}
func SegmentFromHeaderBytes(headerBytes []byte, seg basicSegment) (*segment, error) {
header := &element.SegmentHeader{}
err := header.UnmarshalHBCI(headerBytes)
if err != nil {
return nil, fmt.Errorf("Error while unmarshaling segment header: %v", err)
}
return NewBasicSegmentWithHeader(header, seg), nil
}
func NewReferencingBasicSegment(position int, ref int, seg basicSegment) *segment {
header := element.NewReferencingSegmentHeader(seg.ID(), position, seg.Version(), ref)
return NewBasicSegmentWithHeader(header, seg)
}
func NewBasicSegment(position int, seg basicSegment) *segment {
header := element.NewSegmentHeader(seg.ID(), position, seg.Version())
return NewBasicSegmentWithHeader(header, seg)
}
func NewBasicSegmentWithHeader(header *element.SegmentHeader, seg basicSegment) *segment {
return &segment{header: header, segment: seg}
}
type segment struct {
segment basicSegment
header *element.SegmentHeader
}
func (s *segment) String() string {
elementStrings := make([]string, len(s.segment.elements())+1)
elementStrings[0] = s.header.String()
for i, de := range s.segment.elements() {
val := reflect.ValueOf(de)
if val.IsValid() && !val.IsNil() {
elementStrings[i+1] = de.String()
}
}
return strings.Join(elementStrings, "+") + "'"
}
func (s *segment) MarshalHBCI() ([]byte, error) {
elementBytes := make([][]byte, len(s.segment.elements())+1)
headerBytes, err := s.header.MarshalHBCI()
if err != nil {
return nil, err
}
elementBytes[0] = headerBytes
for i, de := range s.segment.elements() {
val := reflect.ValueOf(de)
if val.IsValid() && !val.IsNil() {
marshaled, err := de.MarshalHBCI()
if err != nil {
return nil, err
}
elementBytes[i+1] = marshaled
}
}
marshaled := bytes.Join(elementBytes, []byte("+"))
marshaled = bytes.TrimRight(marshaled, "+")
marshaled = append(marshaled, '\'')
return marshaled, nil
}
func (s *segment) DataElements() []element.DataElement {
var dataElements []element.DataElement
dataElements = append(dataElements, s.header)
dataElements = append(dataElements, s.segment.elements()...)
return dataElements
}
func (s *segment) Header() *element.SegmentHeader {
return s.header
}
func (s *segment) ID() string {
return s.header.ID.Val()
}
func (s *segment) Version() int {
return s.header.Version.Val()
}
func (s *segment) SetPosition(positionFn func() int) {
s.header.SetPosition(positionFn())
}
func (s *segment) SetReference(ref int) {
s.header.SetReference(ref)
}