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MultipleIterator.php
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MultipleIterator.php
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<?php
namespace MediaWiki\Extension\Notifications\Iterator;
use ArrayIterator;
use Iterator;
use RecursiveIterator;
/**
* Presents a list of iterators as a single stream of results
* when wrapped with the RecursiveIteratorIterator.
*
* This differs from the SPL MultipleIterator in the following ways:
* * Does not return null for non-valid child iterators
* * implements RecursiveIterator
* * Lots less features(e.g. simple!)
*/
class MultipleIterator implements RecursiveIterator {
/** @var Iterator[] */
protected $active = [];
/** @var array */
protected $children;
/** @var int */
protected $key = 0;
public function __construct( array $children ) {
$this->children = $children;
}
public function rewind(): void {
$this->active = $this->children;
$this->key = 0;
foreach ( $this->active as $key => $it ) {
$it->rewind();
if ( !$it->valid() ) {
unset( $this->active[$key] );
}
}
}
public function valid(): bool {
return (bool)$this->active;
}
public function next(): void {
$this->key++;
foreach ( $this->active as $key => $it ) {
$it->next();
if ( !$it->valid() ) {
unset( $this->active[$key] );
}
}
}
#[\ReturnTypeWillChange]
public function current() {
$result = [];
foreach ( $this->active as $it ) {
$result[] = $it->current();
}
return $result;
}
public function key(): int {
return $this->key;
}
public function hasChildren(): bool {
return (bool)$this->active;
}
public function getChildren(): ?RecursiveIterator {
// The NotRecursiveIterator is used rather than a RecursiveArrayIterator
// so that nested arrays don't get recursed.
return new NotRecursiveIterator( new ArrayIterator( $this->current() ) );
}
}

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text/x-php
Expires
Oct 4 2026, 05:32 (5 w, 17 h ago)
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MultipleIterator.php (1 KB)

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