Adjust copyrights years

<?php
/**
 * SeekQuarry/Yioop --
 * Open Source Pure PHP Search Engine, Crawler, and Indexer
 *
 * Copyright (C) 2009 - 2021  Chris Pollett chris@pollett.org
 *
 * LICENSE:
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see <https://www.gnu.org/licenses/>.
 *
 * END LICENSE
 *
 * This file contains unit tests of the IndexDocumentBundleTable class
 *
 * @author Chris Pollett chris@pollett.org
 * @license https://www.gnu.org/licenses/ GPL3
 * @link https://www.seekquarry.com/
 * @copyright 2009 - 2021
 * @filesource
 */
namespace seekquarry\yioop\tests;

use seekquarry\yioop\configs as C;
use seekquarry\yioop\library as L;
use seekquarry\yioop\models\Model;
use seekquarry\yioop\library\CrawlConstants as CC;
use seekquarry\yioop\library\IndexDocumentBundle;
use seekquarry\yioop\library\IndexManager;
use seekquarry\yioop\library\UnitTest;
use seekquarry\yioop\library\index_bundle_iterators\WordIterator;

/**
 *
 */
 class WordIteratorTest extends UnitTest
{
    /**
     *
     */
    const TEST_BUNDLE = "IndexData200000000";
    /**
     * Prefix of folders for index manager test
     */
    const TEST_DIR = __DIR__ . '/test_files/word_iterator_test';

    /**
     * Sets up an array to keep track of what linear hash tables we've made
     * so that we can delete them when done a test.
     */
    public function setUp()
    {
        $test_bundle = self::TEST_BUNDLE;
        if (!file_exists(self::TEST_DIR)) {
            mkdir(self::TEST_DIR);
        }
        $this->index_archive = new IndexDocumentBundle(self::TEST_DIR .
            "/$test_bundle", false, "TestBundle", 3, 5);
    }
    /**
     *
     */
    public function tearDown()
    {
        $model = new Model();
        $model->db->unlinkRecursive(self::TEST_DIR);
    }
    /**
     *
     */
    public function createTestCase()
    {
        IndexManager::clearCache();
        $index_archive = $this->index_archive;
        $dictionary = $index_archive->dictionary;
        $keys = [];
        for ($i = 0; $i < 10; $i++) {
            $keys[$i] = $this->docidFromIntKeys($i, $i, $i);
            $docs[] = [
                CC::DOC_ID => $keys[$i],
                CC::SUMMARY =>
                    [
                        CC::DESCRIPTION => "to$i be or$i not$i to$i be...",
                        CC::HASH => str_pad("$i", 8, "0", STR_PAD_LEFT),
                        CC::TITLE => "Some$i Shakespeare$i Play$i",
                        CC::URL => "https://www.somewhere$i.com/"
                    ],
                CC::PAGE => "Page $i",
            ];
        }
        $num_docs = count($docs);
        $index_archive->addPages($docs, $num_docs);
        $index_archive->updateDictionary();
        $index_archive->forceSave();
        $word_iterator = new WordIterator(L\canonicalTerm("be"),
            self::TEST_DIR . "/". self::TEST_BUNDLE, true, null, 1);
    }
    /**
     *
     */
    protected function docidFromInt($i)
    {
            return str_pad("$i", 24, "0", STR_PAD_LEFT);
    }
    /**
     *
     */
    protected function docidFromIntKeys($i_hash_url, $j_hash_page,
        $k_hash_host, $is_doc = true)
    {
            $doc_or_link = ($is_doc) ? "d" : "l";
            return str_pad("$i_hash_url", 8, "0", STR_PAD_LEFT) . $doc_or_link .
                str_pad("$j_hash_page", 7, "0", STR_PAD_LEFT) .
                str_pad("$k_hash_host", 8, "0", STR_PAD_LEFT);
    }
}