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package element
import "fmt"
// NewReferencingSegmentHeader returns a new SegmentHeader with a reference to
// another segment
func NewReferencingSegmentHeader(id string, position, version, referencePosition int) *SegmentHeader {
header := NewSegmentHeader(id, position, version)
header.Ref = NewNumber(referencePosition, 3)
return header
}
// NewSegmentHeader returns a new SegmentHeader for the id, position and version
func NewSegmentHeader(id string, position, version int) *SegmentHeader {
header := &SegmentHeader{
ID: NewAlphaNumeric(id, 6),
Position: NewNumber(position, 3),
Version: NewNumber(version, 3),
}
header.DataElement = NewDataElementGroup(segmentHeaderDEG, 4, header)
return header
}
// A SegmentHeader represents the metadata of a given segment such as ID or version
type SegmentHeader struct {
DataElement
ID *AlphaNumericDataElement
Position *NumberDataElement
Version *NumberDataElement
Ref *NumberDataElement
}
// Type returns the DataElementType of s
func (s *SegmentHeader) Type() DataElementType {
return segmentHeaderDEG
}
// SetPosition sets the number of the segment
func (s *SegmentHeader) SetPosition(pos int) {
*s.Position = *NewNumber(pos, 3)
}
// SetReference sets the reference to another segment
func (s *SegmentHeader) SetReference(ref int) {
*s.Ref = *NewNumber(ref, 3)
}
// ReferencingSegment returns the reference number of the referenced segment
func (s *SegmentHeader) ReferencingSegment() int {
if s.Ref != nil {
return s.Ref.Val()
}
return -1
}
// IsValid returns true if the DataElement and all its grouped elements
// are valid, false otherwise
func (s *SegmentHeader) IsValid() bool {
if s.ID == nil || s.Position == nil || s.Version == nil {
return false
}
return s.DataElement.IsValid()
}
// GroupDataElements returns the grouped DataElements
func (s *SegmentHeader) GroupDataElements() []DataElement {
return []DataElement{
s.ID,
s.Position,
s.Version,
s.Ref,
}
}
// UnmarshalHBCI unmarshals value into s
func (s *SegmentHeader) UnmarshalHBCI(value []byte) error {
elements, err := ExtractElements(value)
if err != nil {
return err
}
if len(elements) < 3 {
return fmt.Errorf("Malformed segment header")
}
s.DataElement = NewDataElementGroup(segmentHeaderDEG, 4, s)
if len(elements) > 0 {
s.ID = &AlphaNumericDataElement{}
err = s.ID.UnmarshalHBCI(elements[0])
if err != nil {
return err
}
}
if len(elements) > 1 {
s.Position = &NumberDataElement{}
err = s.Position.UnmarshalHBCI(elements[1])
if err != nil {
return fmt.Errorf("Malformed segment header number: %v", err)
}
}
if len(elements) > 2 {
s.Version = &NumberDataElement{}
err = s.Version.UnmarshalHBCI(elements[2])
if err != nil {
return fmt.Errorf("Malformed segment header version: %v", err)
}
}
if len(elements) > 3 && len(elements[3]) > 0 {
s.Ref = &NumberDataElement{}
err = s.Ref.UnmarshalHBCI(elements[3])
if err != nil {
return fmt.Errorf("Malformed segment header reference: %v", err)
}
}
return nil
}
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