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+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Database schema utilities
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category Database
+ * @package Laconica
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @copyright 2009 Control Yourself, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+ exit(1);
+}
+
+/**
+ * Class representing the database schema
+ *
+ * A class representing the database schema. Can be used to
+ * manipulate the schema -- especially for plugins and upgrade
+ * utilities.
+ *
+ * @category Database
+ * @package Laconica
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+class Schema
+{
+ protected $db = null;
+
+ static function get()
+ {
+
+ }
+
+ public function getTableDef($name)
+ {
+ }
+
+ public function getColumnDef($table, $column)
+ {
+ }
+
+ public function getIndexDef($table, $index)
+ {
+ }
+
+ public function createTable($name, $columns, $indices=null)
+ {
+ }
+
+ public function dropTable($name)
+ {
+ }
+
+ public function createIndex($name, $table, $columns)
+ {
+ }
+
+ public function dropIndex($name, $table)
+ {
+ }
+
+ public function addColumn($table, $columndef)
+ {
+ }
+
+ public function modifyColumn($table, $column, $columndef)
+ {
+ }
+
+ public function dropColumn($table, $column)
+ {
+ }
+
+ public function ensureTable($name, $columns, $indices)
+ {
+ $def = $this->tableDef($name);
+ if (empty($def)) {
+ return $this->createTable($name, $columns, $indices);
+ }
+ }
+}
+
+class TableDef
+{
+ public $name;
+ public $columns;
+}
+
+class ColumnDef
+{
+ public $name;
+ public $type;
+ public $size;
+}
+
+class IndexDef
+{
+ public $name;
+ public $table;
+ public $columns;
+}