1 files changed, 59 insertions, 0 deletions
diff --git a/includes/dao/DBAccessObjectUtils.php b/includes/dao/DBAccessObjectUtils.php
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+++ b/includes/dao/DBAccessObjectUtils.php
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+<?php
+/**
+ * This file contains database access object related constants.
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Database
+ */
+
+/**
+ * Helper class for DAO classes
+ *
+ * @since 1.26
+ */
+class DBAccessObjectUtils {
+	/**
+	 * @param integer $bitfield
+	 * @param integer $flags IDBAccessObject::READ_* constant
+	 * @return bool Bitfield has flag $flag set
+	 */
+	public static function hasFlags( $bitfield, $flags ) {
+		return ( $bitfield & $flags ) == $flags;
+	}
+
+	/**
+	 * Get an appropriate DB index and options for a query
+	 *
+	 * @param integer $bitfield
+	 * @return array (DB_MASTER/DB_SLAVE, SELECT options array)
+	 */
+	public static function getDBOptions( $bitfield ) {
+		$index = self::hasFlags( $bitfield, IDBAccessObject::READ_LATEST )
+			? DB_MASTER
+			: DB_SLAVE;
+
+		$options = array();
+		if ( self::hasFlags( $bitfield, IDBAccessObject::READ_EXCLUSIVE ) ) {
+			$options[] = 'FOR UPDATE';
+		} elseif ( self::hasFlags( $bitfield, IDBAccessObject::READ_LOCKING ) ) {
+			$options[] = 'LOCK IN SHARE MODE';
+		}
+
+		return array( $index, $options );
+	}
+}