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Copyright (C) Villanova University 2021, 2022.

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:1:{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:39:"Demian Katz <demian.katz@villanova.edu>";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:"cb57e1ae2b1b1d414f4bfef9d4472ef7";s:7:" * path";s:62:"VuFind/src/VuFind/Sitemap/Plugin/Index/CursorMarkIdFetcher.php";s:9:" * source";s:5194:"<?php

/**
 * Plugin to get IDs for a sitemap from a backend using cursor marks (if supported).
 *
 * PHP version 8
 *
 * Copyright (C) Villanova University 2021, 2022.
 *
 * 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   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org
 */

namespace VuFind\Sitemap\Plugin\Index;

use VuFindSearch\Backend\Solr\Response\Json\RecordCollectionFactory;
use VuFindSearch\Command\GetIdsCommand;
use VuFindSearch\ParamBag;
use VuFindSearch\Query\Query;

/**
 * Plugin to get IDs for a sitemap from a backend using cursor marks (if supported).
 *
 * @category VuFind
 * @package  Search
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org
 */
class CursorMarkIdFetcher extends AbstractIdFetcher
{
    /**
     * Previous cursor mark
     *
     * @var string
     */
    protected $prevCursorMark = '';

    /**
     * Default parameters to send to Solr with each request
     *
     * @var array
     */
    protected $defaultParams = [
        'q' => '*:*',
        'start' => 0, // Always 0 when using a cursorMark
        'wt' => 'json',
        // Override any default timeAllowed since it cannot be used with
        // cursorMark
        'timeAllowed' => -1,
    ];

    /**
     * Get the initial offset to seed the search process
     *
     * @return string
     */
    public function getInitialOffset(): string
    {
        return '*';
    }

    /**
     * Set up the backend.
     *
     * @param string $backend Search backend ID
     *
     * @return void
     */
    public function setupBackend(string $backend): void
    {
        // Set up the record factory. We use a very simple factory since performance
        // is important and we only need the identifier.
        $recordFactory = function ($data) {
            return new \VuFindSearch\Response\SimpleRecord($data);
        };
        $this->searchService->invoke(
            new \VuFindSearch\Command\SetRecordCollectionFactoryCommand(
                $backend,
                new RecordCollectionFactory($recordFactory)
            )
        );

        // Reset the "previous cursor mark" (in case we're reusing this object on
        // multiple backends).
        $this->prevCursorMark = '';
    }

    /**
     * Retrieve a batch of IDs. Returns an array with two possible keys: ids (the
     * latest set of retrieved IDs) and nextOffset (an offset which can be passed
     * to the next call to this function to retrieve the next page). When all IDs
     * have been retrieved, the nextOffset value MUST NOT be included in the return
     * array.
     *
     * @param string $backend      Search backend ID
     * @param string $cursorMark   String representing progress through set
     * @param int    $countPerPage Page size
     * @param array  $filters      Filters to apply to the search
     *
     * @return array
     */
    public function getIdsFromBackend(
        string $backend,
        string $cursorMark,
        int $countPerPage,
        array $filters
    ): array {
        // If the previous cursor mark matches the current one, we're finished!
        if ($cursorMark === $this->prevCursorMark) {
            return ['ids' => []];
        }
        $this->prevCursorMark = $cursorMark;

        $getKeyCommand = new \VuFindSearch\Command\GetUniqueKeyCommand($backend, []);
        $key = $this->searchService->invoke($getKeyCommand)->getResult();
        $params = new ParamBag(
            $this->defaultParams + [
                'rows' => $countPerPage,
                'sort' => $key . ' asc',
                'cursorMark' => $cursorMark,
                'fl' => 'last_indexed',
            ]
        );
        // Apply filters:
        foreach ($filters as $filter) {
            $params->add('fq', $filter);
        }
        $command = new GetIdsCommand(
            $backend,
            new Query('*:*'),
            0,
            $countPerPage,
            $params
        );

        $results = $this->searchService->invoke($command)->getResult();
        $ids = [];
        $lastmods = [];
        foreach ($results->getRecords() as $doc) {
            $ids[] = $doc->get($key);
            $lastmods[] = $doc->get('last_indexed');
        }
        $nextOffset = $results->getCursorMark();
        return compact('ids', 'nextOffset', 'lastmods');
    }
}
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