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<?php
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declare(strict_types=1);
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namespace PhpScience\PageRank\Service;
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use PhpScience\PageRank\Data\NodeCollectionInterface;
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use PhpScience\PageRank\Service\PageRankAlgorithm\NormalizerInterface;
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use PhpScience\PageRank\Service\PageRankAlgorithm\RankingInterface;
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use PhpScience\PageRank\Strategy\NodeDataSourceStrategyInterface;
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class PageRankAlgorithm implements PageRankAlgorithmInterface
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{
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private NodeDataSourceStrategyInterface $nodeDataStrategy;
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private RankingInterface $ranking;
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private NormalizerInterface $normalizer;
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public function __construct(
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RankingInterface $ranking,
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NodeDataSourceStrategyInterface $nodeDataStrategy,
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NormalizerInterface $normalizer
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) {
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$this->nodeDataStrategy = $nodeDataStrategy;
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$this->ranking = $ranking;
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$this->normalizer = $normalizer;
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}
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public function run(int $maxIterate): NodeCollectionInterface
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{
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$this->initiateRanking();
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$this->runBatch($maxIterate);
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return $this->normalize();
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}
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public function initiateRanking(): NodeCollectionInterface
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{
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$nodeCollection = $this->nodeDataStrategy->getNodeCollection();
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$this->ranking->calculateInitialRank($nodeCollection);
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$this->nodeDataStrategy->updateNodes($nodeCollection);
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return $nodeCollection;
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}
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public function runBatch(int $maxIterate): NodeCollectionInterface
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{
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$nodeCollection = $this->nodeDataStrategy->getNodeCollection();
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$this->powerIterate($nodeCollection, $maxIterate);
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return $nodeCollection;
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}
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public function normalize(): NodeCollectionInterface
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{
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$nodeCollection = $this->nodeDataStrategy->getNodeCollection();
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$min = $this->nodeDataStrategy->getLowestRank();
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$max = $this->nodeDataStrategy->getHighestRank();
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$this->normalizer->normalize(
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$nodeCollection,
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$min,
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$max
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);
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return $nodeCollection;
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}
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private function powerIterate(
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NodeCollectionInterface $nodeCollection,
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int $maxIterate
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): void {
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$noneRepresentableDiffCount = 0;
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$i = 0;
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while (
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$i < $maxIterate
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&& $noneRepresentableDiffCount < $nodeCollection->getAllNodeCount()
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) {
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$i++;
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$noneRepresentableDiffCount = $this
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->ranking
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->calculateRankPerIteration($nodeCollection);
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$this->nodeDataStrategy->updateNodes($nodeCollection);
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}
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}
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}
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PHP-Science /
PageRank
