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<?php |
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namespace drupol\phpermutations\Iterators; |
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use drupol\phpermutations\Combinatorics; |
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/** |
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* Class Product. |
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* |
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* @package drupol\phpermutations\Iterators |
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*/ |
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class Product extends Combinatorics implements \Iterator, \Countable |
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{ |
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/** |
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* The key. |
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* |
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* @var int |
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*/ |
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protected $key; |
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/** |
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* The iterators. |
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* |
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* @var \Iterator[] |
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*/ |
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protected $iterators = []; |
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/** |
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* Product constructor. |
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* |
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* @param array $datasetArray |
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* The array of dataset. |
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*/ |
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public function __construct(array $datasetArray) |
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{ |
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parent::__construct($datasetArray); |
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foreach ($datasetArray as $dataset) { |
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$this->iterators[] = new \ArrayIterator($dataset); |
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} |
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$this->key = 0; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function current() |
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{ |
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$tuple = []; |
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foreach ($this->iterators as $iterator) { |
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$tuple[] = $iterator->current(); |
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} |
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return $tuple; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function next() |
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{ |
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foreach (array_reverse($this->iterators) as $key => $iterator) { |
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$iterator->next(); |
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if ($iterator->valid()) { |
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$count_iterators = count($this->iterators); |
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foreach ($this->iterators as $key2 => $iterator2) { |
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if ($key >= $count_iterators - $key2) { |
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$iterator2->rewind(); |
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} |
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} |
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break; |
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} |
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} |
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$this->key++; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function key() |
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{ |
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return $this->key; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function valid() |
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{ |
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$isUnlessOneValid = false; |
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foreach ($this->iterators as $iterator) { |
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if ($iterator->valid()) { |
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$isUnlessOneValid = true; |
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} |
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} |
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return $isUnlessOneValid; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function rewind() |
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{ |
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foreach ($this->iterators as $iterator) { |
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$iterator->rewind(); |
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} |
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$this->key = 0; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function count() |
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{ |
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$product = 1; |
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foreach ($this->getDataset() as $dataset) { |
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$product *= count($dataset); |
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} |
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return $product; |
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} |
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/** |
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* Convert the iterator into an array. |
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* |
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* @return array |
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* The elements. |
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*/ |
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View Code Duplication |
public function toArray() |
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{ |
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$data = []; |
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for ($this->rewind(); $this->valid(); $this->next()) { |
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$data[] = $this->current(); |
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} |
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return $data; |
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} |
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} |
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This check marks variable names that have not been written in camelCase.
In camelCase names are written without any punctuation, the start of each new word being marked by a capital letter. Thus the name database connection string becomes
databaseConnectionString
.