97 lines
2.5 KiB
PHP
97 lines
2.5 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* This file is part of the TYPO3 CMS project.
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*
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* It is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, either version 2
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* of the License, or any later version.
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*
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* For the full copyright and license information, please read the
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* LICENSE.txt file that was distributed with this source code.
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*
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* The TYPO3 project - inspiring people to share!
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*/
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namespace TYPO3\CMS\Core\Resource\Collection;
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use TYPO3\CMS\Core\Resource\FileReference;
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/**
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* When first accessed, this class will initialize itself and find the file references
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* for this record field.
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*
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* This class acts as a "Value holder", as it only fetches the related file references
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* when needed.
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*
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* @internal not part of public API, as this needs to be streamlined and proven
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*/
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class LazyFileReferenceCollection implements \IteratorAggregate, \ArrayAccess, \Countable
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{
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/**
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* @var FileReference[]|\Closure
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*/
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private array|\Closure $items;
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public function __construct(
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private readonly mixed $fieldValue,
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\Closure $initialization
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) {
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$this->items = $initialization;
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}
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public function count(): int
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{
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$this->initialize();
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return count($this->items);
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}
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private function initialize(): void
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{
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if ($this->items instanceof \Closure) {
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$this->items = ($this->items)();
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}
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}
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public function getIterator(): \Iterator
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{
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$this->initialize();
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return new \ArrayIterator($this->items);
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}
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public function __toString(): string
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{
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return (string)$this->fieldValue;
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}
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public function offsetExists(mixed $offset): bool
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{
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$this->initialize();
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return isset($this->items[$offset]);
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}
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public function offsetGet(mixed $offset): mixed
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{
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$this->initialize();
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return $this->items[$offset] ?? null;
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}
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public function offsetSet(mixed $offset, mixed $value): void
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{
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if ($value instanceof FileReference === false) {
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throw new \InvalidArgumentException(
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'Modifying the file reference collection is only allowed by setting a value of type FileReference.',
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1723188317
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);
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}
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$this->items[$offset] = $value;
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}
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public function offsetUnset(mixed $offset): void
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{
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throw new \RuntimeException('Removing items from the file reference collection is not implemented.', 1723188318);
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}
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}
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