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<?php |
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declare(strict_types = 1); |
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namespace drupol\phpartition; |
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use drupol\phpartition\Partition\Partition; |
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use drupol\phpartition\Partitions\Partitions; |
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/** |
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* Class Greedy. |
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*/ |
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class Greedy extends Partitioner |
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{ |
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/** |
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* @var \ArrayObject |
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*/ |
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protected $dataset; |
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/** |
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* Greedy constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->dataset = new \ArrayObject(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function add(...$values) |
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{ |
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foreach ($values as $value) { |
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$this->dataset->append($value); |
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} |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getDataset() |
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{ |
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$dataset = $this->dataset; |
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$partitionItemFactory = $this->getPartitionItemFactory(); |
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// Greedy needs a dataset sorted DESC. |
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$copy = $dataset->getArrayCopy(); |
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\uasort( |
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$copy, |
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static function ($a, $b) use ($partitionItemFactory) { |
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$left = $partitionItemFactory::create($a); |
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$right = $partitionItemFactory::create($b); |
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return $left->getWeight() <=> $right->getWeight(); |
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} |
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); |
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$dataset->exchangeArray(\array_reverse($copy)); |
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return $dataset; |
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} |
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/** |
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* @param \drupol\phpartition\Partitions\Partitions $partitions |
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* @param array $dataset |
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* @param int $chunks |
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*/ |
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protected function fillPartitions(Partitions $partitions, array $dataset, int $chunks): void |
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{ |
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foreach ($dataset as $data) { |
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$this->findPartition($data, null, $dataset, $partitions) |
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->append($data); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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private function findPartition($value, $key, array $dataset, Partitions $partitions): Partition |
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{ |
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return $partitions |
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->sort() |
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->partition(0); |
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} |
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} |
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drupol /
phpartition
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