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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 | * @file |
| 19 | */ |
| 20 | namespace Wikimedia\Rdbms\Database; |
| 21 | |
| 22 | use Wikimedia\Rdbms\DBLanguageError; |
| 23 | |
| 24 | /** |
| 25 | * @ingroup Database |
| 26 | * @internal |
| 27 | * @since 1.39 |
| 28 | */ |
| 29 | class DatabaseFlags implements IDatabaseFlags { |
| 30 | /** @var int Current bit field of class DBO_* constants */ |
| 31 | protected $flags; |
| 32 | /** @var int[] Prior flags member variable values */ |
| 33 | private $priorFlags = []; |
| 34 | |
| 35 | /** @var string[] List of DBO_* flags that can be changed after connection */ |
| 36 | protected const MUTABLE_FLAGS = [ |
| 37 | 'DBO_DEBUG', |
| 38 | 'DBO_NOBUFFER', |
| 39 | 'DBO_TRX', |
| 40 | 'DBO_DDLMODE', |
| 41 | ]; |
| 42 | /** @var int Bit field of all DBO_* flags that can be changed after connection */ |
| 43 | protected const DBO_MUTABLE = ( |
| 44 | self::DBO_DEBUG | self::DBO_NOBUFFER | self::DBO_TRX | self::DBO_DDLMODE |
| 45 | ); |
| 46 | |
| 47 | public function __construct( $flags ) { |
| 48 | $this->flags = $flags; |
| 49 | } |
| 50 | |
| 51 | public function setFlag( $flag, $remember = self::REMEMBER_NOTHING ) { |
| 52 | if ( $flag & ~static::DBO_MUTABLE ) { |
| 53 | throw new DBLanguageError( |
| 54 | "Got $flag (allowed: " . implode( ', ', static::MUTABLE_FLAGS ) . ')' |
| 55 | ); |
| 56 | } |
| 57 | |
| 58 | if ( $remember === self::REMEMBER_PRIOR ) { |
| 59 | $this->priorFlags[] = $this->flags; |
| 60 | } |
| 61 | |
| 62 | $this->flags |= $flag; |
| 63 | } |
| 64 | |
| 65 | public function clearFlag( $flag, $remember = self::REMEMBER_NOTHING ) { |
| 66 | if ( $flag & ~static::DBO_MUTABLE ) { |
| 67 | throw new DBLanguageError( |
| 68 | "Got $flag (allowed: " . implode( ', ', static::MUTABLE_FLAGS ) . ')' |
| 69 | ); |
| 70 | } |
| 71 | |
| 72 | if ( $remember === self::REMEMBER_PRIOR ) { |
| 73 | $this->priorFlags[] = $this->flags; |
| 74 | } |
| 75 | |
| 76 | $this->flags &= ~$flag; |
| 77 | } |
| 78 | |
| 79 | public function restoreFlags( $state = self::RESTORE_PRIOR ) { |
| 80 | if ( !$this->priorFlags ) { |
| 81 | return; |
| 82 | } |
| 83 | |
| 84 | if ( $state === self::RESTORE_INITIAL ) { |
| 85 | $this->flags = reset( $this->priorFlags ); |
| 86 | $this->priorFlags = []; |
| 87 | } else { |
| 88 | $this->flags = array_pop( $this->priorFlags ); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | public function getFlag( $flag ) { |
| 93 | return ( ( $this->flags & $flag ) === $flag ); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * @param int $flags A bitfield of flags |
| 98 | * @param int $bit Bit flag constant |
| 99 | * @return bool Whether the bit field has the specified bit flag set |
| 100 | * @since 1.34 |
| 101 | */ |
| 102 | public static function contains( int $flags, int $bit ) { |
| 103 | return ( ( $flags & $bit ) === $bit ); |
| 104 | } |
| 105 | |
| 106 | public function hasImplicitTrxFlag() { |
| 107 | return $this->getFlag( self::DBO_TRX ); |
| 108 | } |
| 109 | |
| 110 | } |