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Copyright (C) Villanova University 2010.
Copyright (C) The National Library of Finland 2021.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2,
as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:17:" * fileDescriptor";N;s:7:" * line";i:0;s:7:" * tags";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:5:{s:8:"category";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:8:"category";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:6:"VuFind";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"package";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"package";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:6:"Search";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:6:"author";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:2:{i:0;O:45:"phpDocumentor\Descriptor\Tag\AuthorDescriptor":3:{s:7:" * name";s:6:"author";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:24:"David Maus <maus@hab.de>";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}i:1;O:45:"phpDocumentor\Descriptor\Tag\AuthorDescriptor":3:{s:7:" * name";s:6:"author";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:43:"Aleksi Peebles <aleksi.peebles@helsinki.fi>";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"license";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"license";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:69:"http://opensource.org/licenses/gpl-2.0.php GNU General Public License";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:4:"link";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:43:"phpDocumentor\Descriptor\Tag\LinkDescriptor":4:{s:7:" * name";s:4:"link";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:0:"";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:7:" * link";s:18:"https://vufind.org";}}}}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:19:" * inheritedElement";N;s:7:" * hash";s:32:"528d6a0f6724e306d9890201d744b1e8";s:7:" * path";s:62:"VuFindSearch/src/VuFindSearch/Command/RetrieveBatchCommand.php";s:9:" * source";s:3630:"<?php

/**
 * Retrieve a batch of documents command.
 *
 * PHP version 8
 *
 * Copyright (C) Villanova University 2010.
 * Copyright (C) The National Library of Finland 2021.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category VuFind
 * @package  Search
 * @author   David Maus <maus@hab.de>
 * @author   Aleksi Peebles <aleksi.peebles@helsinki.fi>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org
 */

namespace VuFindSearch\Command;

use VuFindSearch\Backend\BackendInterface;
use VuFindSearch\Feature\RetrieveBatchInterface;
use VuFindSearch\ParamBag;

/**
 * Retrieve a batch of documents command.
 *
 * @category VuFind
 * @package  Search
 * @author   David Maus <maus@hab.de>
 * @author   Aleksi Peebles <aleksi.peebles@helsinki.fi>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org
 */
class RetrieveBatchCommand extends CallMethodCommand
{
    /**
     * Record identifiers.
     *
     * @var array
     */
    protected $ids;

    /**
     * RetrieveBatchCommand constructor.
     *
     * @param string    $backendId Search backend identifier
     * @param array     $ids       Record identifiers
     * @param ?ParamBag $params    Search backend parameters
     */
    public function __construct(
        string $backendId,
        array $ids,
        ?ParamBag $params = null
    ) {
        $this->ids = $ids;
        parent::__construct(
            $backendId,
            RetrieveBatchInterface::class,
            'retrieveBatch',
            $params
        );
    }

    /**
     * Return search backend interface method arguments.
     *
     * @return array
     */
    public function getArguments(): array
    {
        return [
            $this->getRecordIdentifiers(),
            $this->getSearchParameters(),
        ];
    }

    /**
     * Execute command on backend.
     *
     * @param BackendInterface $backend Backend
     *
     * @return CommandInterface Command instance for method chaining
     */
    public function execute(BackendInterface $backend): CommandInterface
    {
        // If the backend implements the RetrieveBatchInterface, we can load
        // all the records at once.
        if ($backend instanceof RetrieveBatchInterface) {
            return parent::execute($backend);
        }

        // Otherwise, we need to load them one at a time and aggregate them.

        $response = false;
        foreach ($this->getRecordIdentifiers() as $id) {
            $next = $backend->retrieve($id, $this->params);
            if (!$response) {
                $response = $next;
            } elseif ($record = $next->first()) {
                $response->add($record);
            }
        }

        return $this->finalizeExecution($response);
    }

    /**
     * Return record identifiers.
     *
     * @return array
     */
    public function getRecordIdentifiers(): array
    {
        return $this->ids;
    }
}
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