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2.15
1<?php
2/**
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
16 * http://www.gnu.org/copyleft/gpl.html
17 *
18 * @file
19 */
20
21/**
22 * Collation class that's essentially a no-op.
23 *
24 * Does sorting based on binary value of the string.
25 * Like how things were pre 1.17.
26 *
27 * @since 1.18
28 */
29class IdentityCollation extends Collation {
30
31    /** @var Language */
32    private $contentLanguage;
33
34    /**
35     * @param Language $contentLanguage
36     */
37    public function __construct( Language $contentLanguage ) {
38        $this->contentLanguage = $contentLanguage;
39    }
40
41    public function getSortKey( $string ) {
42        return $string;
43    }
44
45    public function getFirstLetter( $string ) {
46        // Copied from UppercaseCollation.
47        // I'm kind of unclear on when this could happen...
48        if ( $string[0] == "\0" ) {
49            $string = substr( $string, 1 );
50        }
51        return $this->contentLanguage->firstChar( $string );
52    }
53}