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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace LambdaTwelve\OneRecord\Model; |
| 6 | |
| 7 | use LambdaTwelve\OneRecord\JsonLd\Comparer; |
| 8 | use LambdaTwelve\OneRecord\JsonLd\Context; |
| 9 | use LambdaTwelve\OneRecord\JsonLd\JsonLd; |
| 10 | use LambdaTwelve\OneRecord\JsonLd\Writer; |
| 11 | use LambdaTwelve\OneRecord\Rdf\BlankNode; |
| 12 | use LambdaTwelve\OneRecord\Rdf\Graph; |
| 13 | use LambdaTwelve\OneRecord\Rdf\Iri; |
| 14 | use LambdaTwelve\OneRecord\Rdf\Literal; |
| 15 | use LambdaTwelve\OneRecord\Rdf\Term; |
| 16 | use LambdaTwelve\OneRecord\Rdf\Triple; |
| 17 | use LambdaTwelve\OneRecord\Spec\Namespaces; |
| 18 | use LambdaTwelve\OneRecord\Vocabulary\Vocabulary; |
| 19 | |
| 20 | /** |
| 21 | * A logistics object: everything said about one URI, including its embedded |
| 22 | * objects (blank nodes, or nodes under the `internal:` prefix once stored). |
| 23 | * |
| 24 | * Immutable. Revision, last-modified and the other things a server knows |
| 25 | * about a stored object are not part of the object itself; they live on the |
| 26 | * stored revision record and in HTTP headers. |
| 27 | */ |
| 28 | final readonly class LogisticsObject |
| 29 | { |
| 30 | public function __construct( |
| 31 | public Iri $iri, |
| 32 | public Graph $graph, |
| 33 | ) { |
| 34 | if (LocalRef::isLocal($iri)) { |
| 35 | throw new ModelException(\sprintf('"%s" is a local key, not a published URI; resolve the graph first.', $iri->value)); |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * @param string|array<string, mixed> $json |
| 41 | */ |
| 42 | public static function fromJsonLd(string|array $json, ?Iri $expectedIri = null): self |
| 43 | { |
| 44 | $document = JsonLd::expand($json, $expectedIri); |
| 45 | $root = $document->root; |
| 46 | if ($root instanceof BlankNode) { |
| 47 | if ($expectedIri === null) { |
| 48 | throw new ModelException('The document has no @id; give the IRI the object is published under.'); |
| 49 | } |
| 50 | $root = $expectedIri; |
| 51 | $graph = self::rename($document->graph, $document->root, $root); |
| 52 | } else { |
| 53 | if ($expectedIri !== null && !$root->equals($expectedIri)) { |
| 54 | throw new ModelException(\sprintf('The document is about "%s", not "%s".', $root->value, $expectedIri->value)); |
| 55 | } |
| 56 | $graph = $document->graph; |
| 57 | } |
| 58 | |
| 59 | return new self($root, $graph); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * @return list<string> class IRIs, sorted |
| 64 | */ |
| 65 | public function types(): array |
| 66 | { |
| 67 | $types = array_map(static fn(Iri $t): string => $t->value, $this->graph->typesOf($this->iri)); |
| 68 | sort($types, SORT_STRING); |
| 69 | |
| 70 | return $types; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * The one class to put in the `Type` header: the most specific of the |
| 75 | * declared types, or the first declared type when they are unrelated. |
| 76 | */ |
| 77 | public function mostSpecificType(?Vocabulary $vocabulary = null): ?string |
| 78 | { |
| 79 | $vocabulary ??= Vocabulary::default(); |
| 80 | $specific = $vocabulary->mostSpecific($this->types()); |
| 81 | $known = array_values(array_filter($specific, static fn(string $t): bool => $vocabulary->isClass($t))); |
| 82 | |
| 83 | return $known[0] ?? $specific[0] ?? null; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * @return list<Term> |
| 88 | */ |
| 89 | public function values(string $propertyIri): array |
| 90 | { |
| 91 | return $this->graph->objects($this->iri, $propertyIri); |
| 92 | } |
| 93 | |
| 94 | public function value(string $propertyIri): ?Term |
| 95 | { |
| 96 | return $this->graph->firstObject($this->iri, $propertyIri); |
| 97 | } |
| 98 | |
| 99 | public function literal(string $propertyIri): ?string |
| 100 | { |
| 101 | $value = $this->value($propertyIri); |
| 102 | |
| 103 | return $value instanceof Literal ? $value->lexical : null; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @return list<Iri|BlankNode> the nodes embedded in this object, in a stable order |
| 108 | */ |
| 109 | public function embeddedNodes(): array |
| 110 | { |
| 111 | $nodes = []; |
| 112 | foreach ($this->graph->subjects() as $subject) { |
| 113 | if (self::isEmbeddedIn($this->graph, $subject, $this->iri)) { |
| 114 | $nodes[$subject->toNTriples()] = $subject; |
| 115 | } |
| 116 | } |
| 117 | ksort($nodes, SORT_STRING); |
| 118 | |
| 119 | return array_values($nodes); |
| 120 | } |
| 121 | |
| 122 | public static function isEmbeddedId(Iri|BlankNode $node): bool |
| 123 | { |
| 124 | return $node instanceof BlankNode || $node->startsWith(Namespaces::EMBEDDED); |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Whether a node is embedded in a graph: a blank node, a node under the |
| 129 | * embedded-id scheme, or any other node that is described in this graph, |
| 130 | * that is, carries a triple other than its class, without being the root. |
| 131 | * The id a client chose for an embedded object (an https: or urn: |
| 132 | * identifier, NE:ONE's neone: scheme) makes it no less embedded (R11-001); |
| 133 | * withEmbeddedIds() replaces such ids when the object is stored. A typed |
| 134 | * link, a reference that states the class of the thing it points to and |
| 135 | * nothing else, remains a reference. |
| 136 | */ |
| 137 | public static function isEmbeddedIn(Graph $graph, Iri|BlankNode $node, ?Iri $root = null): bool |
| 138 | { |
| 139 | if ($root !== null && $node->equals($root)) { |
| 140 | return false; |
| 141 | } |
| 142 | |
| 143 | return self::isEmbeddedId($node) || self::isDescribedIn($graph, $node); |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Whether the graph says more about a node than its class. |
| 148 | */ |
| 149 | public static function isDescribedIn(Graph $graph, Iri|BlankNode $node): bool |
| 150 | { |
| 151 | foreach ($graph->about($node) as $triple) { |
| 152 | if ($triple->predicate->value !== Graph::RDF_TYPE) { |
| 153 | return true; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | return false; |
| 158 | } |
| 159 | |
| 160 | public function withIri(Iri $iri): self |
| 161 | { |
| 162 | return new self($iri, self::rename($this->graph, $this->iri, $iri)); |
| 163 | } |
| 164 | |
| 165 | public function withGraph(Graph $graph): self |
| 166 | { |
| 167 | return new self($this->iri, $graph); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Give every embedded node a stable embedded id (the spec's `internal:` |
| 172 | * scheme): blank nodes, and nodes a client identified itself (an https: or |
| 173 | * urn: id, NE:ONE's neone: scheme), which are embedded all the same since |
| 174 | * they carry triples inside this object (R11-001). A server does this once, |
| 175 | * when it first stores an object: from then on a change can name an |
| 176 | * embedded node by the id the server minted, and nothing else in the |
| 177 | * stored graph is a subject but the object and its embedded nodes. |
| 178 | * References without triples of their own (other logistics objects, |
| 179 | * code-list members) are left as they are. |
| 180 | */ |
| 181 | public function withEmbeddedIds(EmbeddedIdMinter $minter): self |
| 182 | { |
| 183 | $graph = $this->graph; |
| 184 | /** @var array<string, array{Iri|BlankNode, Iri}> $minted */ |
| 185 | $minted = []; |
| 186 | foreach ($graph as $triple) { |
| 187 | foreach ([$triple->subject, $triple->object] as $term) { |
| 188 | if ($term instanceof BlankNode && !isset($minted[$term->toNTriples()])) { |
| 189 | $minted[$term->toNTriples()] = [$term, $minter->mint($this->iri, 'r1:' . $term->label)]; |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | foreach ($graph->subjects() as $subject) { |
| 194 | if ($subject instanceof Iri && !self::isEmbeddedId($subject) && self::isEmbeddedIn($graph, $subject, $this->iri) && !isset($minted[$subject->toNTriples()])) { |
| 195 | $minted[$subject->toNTriples()] = [$subject, $minter->mint($this->iri, 'r1:' . $subject->value)]; |
| 196 | } |
| 197 | } |
| 198 | foreach ($minted as [$from, $iri]) { |
| 199 | $graph = self::rename($graph, $from, $iri); |
| 200 | } |
| 201 | |
| 202 | return $minted === [] ? $this : new self($this->iri, $graph); |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * @return array<string, mixed> |
| 207 | */ |
| 208 | public function toJsonLd(?Context $context = null): array |
| 209 | { |
| 210 | return (new Writer())->write($this->graph, $this->iri, $context ?? Context::oneRecord()); |
| 211 | } |
| 212 | |
| 213 | public function toJson(?Context $context = null, bool $pretty = true): string |
| 214 | { |
| 215 | return JsonLd::compactToJson($this->graph, $this->iri, $context ?? Context::oneRecord(), $pretty); |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Same URI and isomorphic graphs (embedded ids compared as blank nodes). |
| 220 | */ |
| 221 | public function isSameAs(self $other, ?Comparer $comparer = null): bool |
| 222 | { |
| 223 | return $this->iri->equals($other->iri) && ($comparer ?? new Comparer())->isomorphic($this->graph, $other->graph); |
| 224 | } |
| 225 | |
| 226 | private static function rename(Graph $graph, Iri|BlankNode $from, Iri $to): Graph |
| 227 | { |
| 228 | $renamed = new Graph(); |
| 229 | foreach ($graph as $triple) { |
| 230 | $subject = $triple->subject->equals($from) ? $to : $triple->subject; |
| 231 | $object = $triple->object->equals($from) ? $to : $triple->object; |
| 232 | $renamed->add(new Triple($subject, $triple->predicate, $object)); |
| 233 | } |
| 234 | |
| 235 | return $renamed; |
| 236 | } |
| 237 | } |