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<?php
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declare(strict_types=1);
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namespace PhpScience\PageRank\Strategy;
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use PhpScience\PageRank\Builder\NodeBuilder;
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use PhpScience\PageRank\Builder\NodeCollectionBuilder;
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use PhpScience\PageRank\Data\NodeCollectionInterface;
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class MemorySourceStrategy implements NodeDataSourceStrategyInterface
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{
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private NodeBuilder $nodeBuilder;
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private NodeCollectionBuilder $nodeCollectionBuilder;
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private array $previousRanks = [];
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private array $nodeListMap;
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private ?NodeCollectionInterface $nodeCollection = null;
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public function __construct(
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NodeBuilder $nodeBuilder,
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NodeCollectionBuilder $nodeCollectionBuilder,
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array $nodeListMap
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) {
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$this->nodeBuilder = $nodeBuilder;
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$this->nodeCollectionBuilder = $nodeCollectionBuilder;
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$this->nodeListMap = $nodeListMap;
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}
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public function getIncomingNodeIds(int $nodeId): array
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{
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return $this->nodeListMap[$nodeId]['in'];
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}
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public function countOutgoingNodes(int $nodeId): int
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{
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return count($this->nodeListMap[$nodeId]['out']);
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}
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public function getPreviousRank(int $nodeId): float
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{
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return $this->previousRanks[$nodeId];
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}
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public function updateNodes(NodeCollectionInterface $collection): void
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{
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foreach ($collection->getNodes() as $item) {
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$this->previousRanks[$item->getId()] = $item->getRank();
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}
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}
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public function getNodeCollection(): NodeCollectionInterface
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{
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if (null === $this->nodeCollection) {
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$nodes = [];
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foreach ($this->nodeListMap as $nodeMap) {
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$nodes[] = $this->nodeBuilder->build($nodeMap);
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}
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$this->nodeCollection = $this->nodeCollectionBuilder->build($nodes);
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}
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return $this->nodeCollection;
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}
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public function getHighestRank(): float
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{
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$highest = null;
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foreach ($this->getNodeCollection()->getNodes() as $node) {
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if (
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null === $highest
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|| $node->getRank() > $highest
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) {
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$highest = $node->getRank();
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}
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}
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return $highest;
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}
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public function getLowestRank(): float
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{
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$lowest = null;
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foreach ($this->getNodeCollection()->getNodes() as $node) {
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if (
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null === $lowest
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|| $node->getRank() < $lowest
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) {
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$lowest = $node->getRank();
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}
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}
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return $lowest;
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}
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}
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PHP-Science /
PageRank
