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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 | |
19 | namespace Cdb; |
20 | |
21 | /** |
22 | * Read data from a CDB file. |
23 | * Native C and pure PHP implementations are provided. |
24 | * |
25 | * @see http://cr.yp.to/cdb.html |
26 | */ |
27 | abstract class Reader { |
28 | /** |
29 | * Open a file and return a subclass instance |
30 | * |
31 | * @param string $fileName |
32 | * @return Reader |
33 | */ |
34 | public static function open( $fileName ): Reader { |
35 | return self::haveExtension() ? |
36 | new Reader\DBA( $fileName ) : |
37 | new Reader\PHP( $fileName ); |
38 | } |
39 | |
40 | /** |
41 | * Returns true if the native extension is available |
42 | * |
43 | * @return bool |
44 | * @codeCoverageIgnore |
45 | */ |
46 | public static function haveExtension(): bool { |
47 | if ( !function_exists( 'dba_handlers' ) ) { |
48 | return false; |
49 | } |
50 | $handlers = dba_handlers(); |
51 | |
52 | return in_array( 'cdb', $handlers ) && in_array( 'cdb_make', $handlers ); |
53 | } |
54 | |
55 | /** |
56 | * Close the file. Optional, you can just let the variable go out of scope. |
57 | */ |
58 | abstract public function close(): void; |
59 | |
60 | /** |
61 | * Get a value with a given key. Only string values are supported. |
62 | * |
63 | * @param string|int $key |
64 | * @return string|false |
65 | */ |
66 | abstract public function get( $key ); |
67 | |
68 | /** |
69 | * Check whether key exists |
70 | * |
71 | * @param string $key |
72 | * @return bool |
73 | */ |
74 | abstract public function exists( $key ): bool; |
75 | |
76 | /** |
77 | * Fetch first key |
78 | * |
79 | * @return string|false |
80 | */ |
81 | abstract public function firstkey(); |
82 | |
83 | /** |
84 | * Fetch next key |
85 | * |
86 | * @return string|false |
87 | */ |
88 | abstract public function nextkey(); |
89 | } |