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<?php |
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namespace Bdf\Collection\Stream; |
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use Bdf\Collection\Stream\Accumulator\AccumulatorInterface; |
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use Bdf\Collection\Stream\Collector\CollectorInterface; |
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use Bdf\Collection\Util\Optional; |
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use Bdf\Collection\Util\OptionalInterface; |
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use EmptyIterator; |
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/** |
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* Null object for streams |
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*/ |
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final class EmptyStream extends EmptyIterator implements StreamInterface |
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{ |
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/** |
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* @var EmptyStream|null |
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*/ |
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private static $instance; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function map(callable $transformer): StreamInterface |
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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 mapKey(callable $function): StreamInterface |
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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 filter(callable $predicate): StreamInterface |
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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 distinct(callable $hashFunction = null): StreamInterface |
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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 sort(callable $comparator = null, bool $preserveKeys = false): StreamInterface |
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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 concat(StreamInterface $stream, bool $preserveKeys = true): StreamInterface |
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{ |
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return $preserveKeys ? $stream : new ConcatStream([$stream], false); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function flatMap(callable $transformer, bool $preserveKeys = false): StreamInterface |
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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 skip(int $count): StreamInterface |
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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 limit(int $count, int $offset = 0): StreamInterface |
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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 forEach(callable $consumer): void |
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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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return []; |
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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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return Optional::empty(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function reduce(callable $accumulator, $initial = null) |
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{ |
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return $initial === null && $accumulator instanceof AccumulatorInterface |
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? $accumulator->initial() |
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: $initial |
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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 collect(CollectorInterface $collector) |
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{ |
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return $collector->finalize(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function matchAll(callable $predicate): bool |
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{ |
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return true; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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1 |
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public function matchOne(callable $predicate): bool |
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{ |
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return false; |
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} |
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/** |
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153
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* Get the Empty stream instance |
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* |
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* @return EmptyStream |
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*/ |
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9 |
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public static function instance(): EmptyStream |
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{ |
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if (self::$instance) { |
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9 |
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return self::$instance; |
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} |
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return self::$instance = new EmptyStream(); |
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} |
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} |
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b2pweb /
bdf-collections
