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| 1 | <?php |
| 2 | |
| 3 | use oat\generis\model\data\Model; |
| 4 | |
| 5 | class helpers_RdfDiff |
| 6 | { |
| 7 | private $added = []; |
| 8 | |
| 9 | private $removed = []; |
| 10 | |
| 11 | private $toAdd = []; |
| 12 | |
| 13 | private $toRemove = []; |
| 14 | |
| 15 | /** |
| 16 | * Creates a diff from a set of triples to a set of troples |
| 17 | * |
| 18 | * |
| 19 | * @param Traversable $from |
| 20 | * @param Traversable $to |
| 21 | */ |
| 22 | public static function create(Traversable $from, Traversable $to) |
| 23 | { |
| 24 | $diff = new self(); |
| 25 | |
| 26 | foreach ($to as $triple) { |
| 27 | $diff->add($triple); |
| 28 | } |
| 29 | |
| 30 | |
| 31 | foreach ($from as $triple) { |
| 32 | $diff->remove($triple); |
| 33 | } |
| 34 | return $diff; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * @return Iterator |
| 39 | */ |
| 40 | public function getTriplesToAdd() |
| 41 | { |
| 42 | return new ArrayIterator($this->toAdd); |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * @return Iterator |
| 47 | */ |
| 48 | public function getTriplesToRemove() |
| 49 | { |
| 50 | return new ArrayIterator($this->toRemove); |
| 51 | } |
| 52 | |
| 53 | protected function add(core_kernel_classes_Triple $triple) |
| 54 | { |
| 55 | $serial = $this->generateSerial($triple); |
| 56 | $this->added[$serial] = true; |
| 57 | if (! isset($this->removed[$serial])) { |
| 58 | $this->toAdd[$serial] = $triple; |
| 59 | } elseif (isset($this->toRemove[$serial])) { |
| 60 | unset($this->toRemove[$serial]); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | protected function remove(core_kernel_classes_Triple $triple) |
| 65 | { |
| 66 | $serial = $this->generateSerial($triple); |
| 67 | $this->removed[$serial] = true; |
| 68 | if (! isset($this->added[$serial])) { |
| 69 | $this->toRemove[$serial] = $triple; |
| 70 | } elseif (isset($this->toAdd[$serial])) { |
| 71 | unset($this->toAdd[$serial]); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | protected function generateSerial(core_kernel_classes_Triple $triple) |
| 76 | { |
| 77 | return md5( |
| 78 | implode( |
| 79 | ' ', |
| 80 | [$triple->subject, $triple->predicate, $triple->object, (string)$triple->lg] |
| 81 | ) |
| 82 | ); |
| 83 | } |
| 84 | |
| 85 | public function getSummary() |
| 86 | { |
| 87 | return count($this->toAdd) . ' triples to add and ' . count($this->toRemove) . ' triples to remove'; |
| 88 | } |
| 89 | |
| 90 | public function dump() |
| 91 | { |
| 92 | foreach ($this->toAdd as $triple) { |
| 93 | echo '+ ' . str_pad($triple->subject, 80) . ' ' . str_pad($triple->predicate, 80) . ' ' |
| 94 | . str_pad($triple->object, 80) . PHP_EOL; |
| 95 | } |
| 96 | foreach ($this->toRemove as $triple) { |
| 97 | echo '- ' . str_pad($triple->subject, 80) . ' ' . str_pad($triple->predicate, 80) . ' ' |
| 98 | . str_pad($triple->object, 80) . PHP_EOL; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | public function applyTo(Model $model) |
| 103 | { |
| 104 | $rdf = $model->getRdfInterface(); |
| 105 | foreach ($this->getTriplesToRemove() as $triple) { |
| 106 | $rdf->remove($triple); |
| 107 | } |
| 108 | foreach ($this->getTriplesToAdd() as $triple) { |
| 109 | $rdf->add($triple); |
| 110 | } |
| 111 | } |
| 112 | } |