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63 lines
1.6 KiB
63 lines
1.6 KiB
<?php
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// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
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//
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// All Rights Reserved. See copyright.txt for details and a complete list of authors.
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// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
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// $Id$
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/**
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* Iterator to read from paginated results until the end is reached. Allows to read
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* a complete result set without loading it all into memory at once. The loader uses
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* a callback function to obtain the result from either the database or a web service.
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*/
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class Services_ResultLoader implements Iterator
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{
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private $offset = 0;
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private $perPage;
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private $callback;
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private $position = 0;
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private $data;
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private $loaded = 0;
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private $isLast = false;
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public function __construct($callback, $perPage = 50)
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{
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$this->perPage = (int) $perPage;
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$this->callback = $callback;
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}
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#[\ReturnTypeWillChange]
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public function current()
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{
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return $this->data[$this->position % $this->perPage];
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}
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public function next(): void
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{
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$this->position++;
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}
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public function rewind(): void
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{
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$this->position = 0;
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}
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#[\ReturnTypeWillChange]
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public function key()
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{
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return $this->position;
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}
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public function valid(): bool
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{
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if ($this->position >= $this->loaded && ! $this->isLast) {
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$this->data = call_user_func($this->callback, $this->position, $this->perPage);
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$this->isLast = count($this->data) < $this->perPage;
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$this->loaded += count($this->data);
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}
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return isset($this->data[$this->position % $this->perPage]);
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}
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}
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