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<?php |
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namespace Bdf\Collection\Stream; |
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use Bdf\Collection\Util\Optional; |
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use Bdf\Collection\Util\OptionalInterface; |
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use Iterator; |
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use function asort; |
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use function current; |
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use function key; |
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use function next; |
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use function reset; |
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use function sort; |
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use function uasort; |
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use function usort; |
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/** |
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* Implementation of StreamInterface::sort() return value |
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* |
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* @internal |
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*/ |
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final class SortStream implements Iterator, StreamInterface |
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{ |
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use StreamTrait; |
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/** |
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* @var StreamInterface |
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*/ |
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private $stream; |
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/** |
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* @var callable |
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*/ |
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private $comparator; |
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/** |
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* @var bool |
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*/ |
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private $preserveKeys; |
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/** |
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* @var array|null |
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*/ |
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private $data = null; |
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/** |
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* SortStream constructor. |
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* |
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* @param StreamInterface $stream |
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* @param callable $comparator |
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* @param bool $preserveKeys |
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*/ |
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public function __construct(StreamInterface $stream, callable $comparator = null, bool $preserveKeys = true) |
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{ |
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$this->stream = $stream; |
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$this->comparator = $comparator; |
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$this->preserveKeys = $preserveKeys; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function toArray(bool $preserveKeys = true): array |
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{ |
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if ($this->data === null) { |
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$this->buildData($preserveKeys && $this->preserveKeys); |
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} |
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return $this->data; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function forEach(callable $consumer): void |
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{ |
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foreach ($this->toArray() as $k => $v) { |
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$consumer($v, $k); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function first(): OptionalInterface |
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{ |
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$empty = true; |
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$min = null; |
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foreach ($this->stream as $value) { |
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if ($empty) { |
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$min = $value; |
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$empty = false; |
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} else { |
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if ($this->comparator === null) { |
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if ($value < $min) { |
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$min = $value; |
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} |
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} elseif (($this->comparator)($value, $min) < 0) { |
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$min = $value; |
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} |
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} |
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} |
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return Optional::nullable($min); |
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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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if ($this->data === null) { |
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$this->buildData(); |
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} |
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return current($this->data); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function next() |
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{ |
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if ($this->data === null) { |
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$this->buildData(); |
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} |
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next($this->data); |
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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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if ($this->data === null) { |
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$this->buildData(); |
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} |
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return key($this->data); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function valid() |
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{ |
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if ($this->data === null) { |
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$this->buildData(); |
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} |
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return key($this->data) !== null; |
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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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if ($this->data === null) { |
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$this->buildData(); |
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} |
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reset($this->data); |
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} |
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/** |
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* Build the inner sorted data array |
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* |
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* @param bool $preserveKeys |
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*/ |
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private function buildData(bool $preserveKeys = true): void |
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{ |
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$this->data = $this->stream->toArray($preserveKeys); |
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if ($this->comparator) { |
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if ($preserveKeys) { |
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uasort($this->data, $this->comparator); |
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} else { |
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usort($this->data, $this->comparator); |
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} |
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} elseif($preserveKeys) { |
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asort($this->data); |
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} else { |
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sort($this->data); |
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} |
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} |
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} |
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b2pweb /
bdf-collections
