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1<?php
2
3declare(strict_types=1);
4
5namespace LambdaTwelve\OneRecord\Change;
6
7use LambdaTwelve\OneRecord\Rdf\BlankNode;
8use LambdaTwelve\OneRecord\Rdf\Iri;
9
10/**
11 * api:Operation: add or delete one triple. The subject is the logistics
12 * object, one of its embedded objects, or a blank node this change adds.
13 */
14final readonly class Operation
15{
16    public function __construct(
17        public OperationKind $kind,
18        public Iri|BlankNode $subject,
19        public Iri $predicate,
20        public OperationObject $object,
21    ) {}
22
23    public static function add(Iri|BlankNode $subject, Iri $predicate, OperationObject $object): self
24    {
25        return new self(OperationKind::Add, $subject, $predicate, $object);
26    }
27
28    public static function delete(Iri|BlankNode $subject, Iri $predicate, OperationObject $object): self
29    {
30        return new self(OperationKind::Delete, $subject, $predicate, $object);
31    }
32
33    /**
34     * The subject as it appears in api:s: an IRI, or a `_:label` string.
35     */
36    public function subjectString(): string
37    {
38        return $this->subject instanceof Iri ? $this->subject->value : $this->subject->toNTriples();
39    }
40}