mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Echo
synced 2024-12-02 19:36:48 +00:00
0f0c6c4fa6
Change-Id: I87fa703da9e7725370d72c58fc40eb204a309e67
79 lines
1.7 KiB
PHP
79 lines
1.7 KiB
PHP
<?php
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namespace MediaWiki\Extension\Notifications\Iterator;
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use ArrayIterator;
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use Iterator;
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use RecursiveIterator;
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/**
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* Presents a list of iterators as a single stream of results
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* when wrapped with the RecursiveIteratorIterator.
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*
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* This differs from the SPL MultipleIterator in the following ways:
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* * Does not return null for non-valid child iterators
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* * implements RecursiveIterator
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* * Lots less features(e.g. simple!)
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*/
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class MultipleIterator implements RecursiveIterator {
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/** @var Iterator[] */
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protected $active = [];
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/** @var array */
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protected $children;
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/** @var int */
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protected $key = 0;
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public function __construct( array $children ) {
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$this->children = $children;
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}
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public function rewind(): void {
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$this->active = $this->children;
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$this->key = 0;
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foreach ( $this->active as $key => $it ) {
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$it->rewind();
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if ( !$it->valid() ) {
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unset( $this->active[$key] );
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}
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}
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}
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public function valid(): bool {
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return (bool)$this->active;
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}
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public function next(): void {
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$this->key++;
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foreach ( $this->active as $key => $it ) {
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$it->next();
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if ( !$it->valid() ) {
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unset( $this->active[$key] );
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}
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}
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}
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#[\ReturnTypeWillChange]
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public function current() {
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$result = [];
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foreach ( $this->active as $it ) {
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$result[] = $it->current();
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}
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return $result;
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}
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public function key(): int {
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return $this->key;
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}
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public function hasChildren(): bool {
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return (bool)$this->active;
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}
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public function getChildren(): ?RecursiveIterator {
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// The NotRecursiveIterator is used rather than a RecursiveArrayIterator
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// so that nested arrays don't get recursed.
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return new NotRecursiveIterator( new ArrayIterator( $this->current() ) );
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}
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}
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