106 lines
2.7 KiB
PHP
106 lines
2.7 KiB
PHP
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<?php
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use oat\generis\model\data\Model;
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class helpers_RdfDiff
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{
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private $added = [];
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private $removed = [];
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private $toAdd = [];
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private $toRemove = [];
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/**
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* Creates a diff from a set of triples to a set of troples
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*
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*
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* @param Traversable $from
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* @param Traversable $to
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*/
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public static function create(Traversable $from, Traversable $to)
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{
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$diff = new self();
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foreach ($to as $triple) {
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$diff->add($triple);
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}
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foreach ($from as $triple) {
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$diff->remove($triple);
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}
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return $diff;
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}
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/**
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* @return Iterator
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*/
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public function getTriplesToAdd()
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{
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return new ArrayIterator($this->toAdd);
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}
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/**
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* @return Iterator
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*/
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public function getTriplesToRemove()
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{
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return new ArrayIterator($this->toRemove);
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}
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protected function add(core_kernel_classes_Triple $triple)
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{
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$serial = $this->generateSerial($triple);
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$this->added[$serial] = true;
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if (! isset($this->removed[$serial])) {
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$this->toAdd[$serial] = $triple;
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} elseif (isset($this->toRemove[$serial])) {
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unset($this->toRemove[$serial]);
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}
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}
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protected function remove(core_kernel_classes_Triple $triple)
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{
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$serial = $this->generateSerial($triple);
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$this->removed[$serial] = true;
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if (! isset($this->added[$serial])) {
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$this->toRemove[$serial] = $triple;
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} elseif (isset($this->toAdd[$serial])) {
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unset($this->toAdd[$serial]);
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}
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}
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protected function generateSerial(core_kernel_classes_Triple $triple)
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{
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return md5(implode(' ', [$triple->subject, $triple->predicate, $triple->object, $triple->lg, $triple->modelid]));
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}
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public function getSummary()
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{
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return count($this->toAdd) . ' triples to add and ' . count($this->toRemove) . ' triples to remove';
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}
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public function dump()
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{
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foreach ($this->toAdd as $triple) {
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echo '+ ' . str_pad($triple->subject, 80) . ' ' . str_pad($triple->predicate, 80) . ' ' . str_pad($triple->object, 80) . PHP_EOL;
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}
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foreach ($this->toRemove as $triple) {
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echo '- ' . str_pad($triple->subject, 80) . ' ' . str_pad($triple->predicate, 80) . ' ' . str_pad($triple->object, 80) . PHP_EOL;
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}
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}
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public function applyTo(Model $model)
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{
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$rdf = $model->getRdfInterface();
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foreach ($this->getTriplesToRemove() as $triple) {
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$rdf->remove($triple);
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}
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foreach ($this->getTriplesToAdd() as $triple) {
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$rdf->add($triple);
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}
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}
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}
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