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entity_identfier.go
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/
entity_identfier.go
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package linkedql
import (
"encoding/json"
"github.com/cayleygraph/quad"
"github.com/cayleygraph/quad/voc"
)
// EntityIdentifierI is an interface to be used where a single entity identifier is expected.
type EntityIdentifierI interface {
BuildIdentifier(ns *voc.Namespaces) (quad.Value, error)
}
// EntityIdentifier is a struct wrapping the interface EntityIdentifierI
type EntityIdentifier struct {
EntityIdentifierI
}
// NewEntityIdentifier constructs a new EntityIdentifer from a EntityIdentiferI
func NewEntityIdentifier(v EntityIdentifierI) EntityIdentifier {
return EntityIdentifier{EntityIdentifierI: v}
}
// UnmarshalJSON implements RawMessage
func (p *EntityIdentifier) UnmarshalJSON(data []byte) error {
var errors []error
var iri EntityIRI
err := json.Unmarshal(data, &iri)
if err == nil {
p.EntityIdentifierI = iri
return nil
}
errors = append(errors, err)
var bnode EntityBNode
err = json.Unmarshal(data, &bnode)
if err == nil {
p.EntityIdentifierI = bnode
return nil
}
errors = append(errors, err)
var s EntityIdentifierString
err = json.Unmarshal(data, &s)
if err == nil {
p.EntityIdentifierI = s
return nil
}
errors = append(errors, err)
return formatMultiError(errors)
}
// EntityIRI is an entity IRI.
type EntityIRI quad.IRI
// BuildIdentifier implements EntityIdentifier
func (iri EntityIRI) BuildIdentifier(ns *voc.Namespaces) (quad.Value, error) {
return quad.IRI(iri).FullWith(ns), nil
}
// EntityBNode is an entity BNode.
type EntityBNode quad.BNode
// BuildIdentifier implements EntityIdentifier
func (i EntityBNode) BuildIdentifier(ns *voc.Namespaces) (quad.Value, error) {
return quad.BNode(i), nil
}
// EntityIdentifierString is an entity IRI or BNode strings.
type EntityIdentifierString string
// BuildIdentifier implements EntityIdentifier
func (i EntityIdentifierString) BuildIdentifier(ns *voc.Namespaces) (quad.Value, error) {
identifier, err := parseIdentifier(string(i))
if err != nil {
return nil, err
}
return AbsoluteValue(identifier, ns), nil
}