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<?php
#
# forum-list bridge
# Copyright (C) 2010 Joel Uckelman
#
# 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 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
require_once(__DIR__ . '/Bridge.php');
require_once(__DIR__ . '/Util.php');
class BridgeImpl implements Bridge {
protected $db;
public function __construct(PDO $db) {
$this->db = $db;
$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
public function getPostId($messageId) {
throw_if_null($messageId);
$sql = 'SELECT post_id FROM posts ' .
'WHERE message_id = ' . $this->db->quote($messageId);
$row = $this->get_exactly_one_row($sql);
return $row ? $row['post_id'] : false;
}
public function getMessageId($postId) {
throw_if_null($postId);
$sql = 'SELECT p1.message_id FROM posts AS p1 ' .
'LEFT OUTER JOIN posts AS p2 ON (' .
'p1.post_id = p2.post_id AND ' .
'p1.edit_id < p2.edit_id' .
') WHERE p1.post_id = ' . $postId . ' AND ' .
'p2.post_id IS NULL';
$row = $this->get_exactly_one_row($sql);
return $row ? $row['message_id'] : false;
}
public function setPostId($messageId, $postId) {
throw_if_null($messageId);
throw_if_null($postId);
$sql = 'UPDATE posts SET ' .
'post_id = ' . $postId . ' ' .
'WHERE message_id = ' . $this->db->quote($messageId);
$count = $this->db->exec($sql);
if ($count != 1) {
throw new Exception('Failed to set post id: ' . $messageId);
}
}
public function getDefaultForumId($list) {
throw_if_null($list);
$sql = 'SELECT forum_id FROM forums ' .
'WHERE list_name = ' . $this->db->quote($list);
$row = $this->get_exactly_one_row($sql);
return $row ? $row['forum_id'] : false;
}
public function getLists($forumId) {
throw_if_null($forumId);
$sql = 'SELECT list_name FROM lists ' .
'WHERE forum_id = ' . $forumId;
$result = $this->db->query($sql);
$rows = $result->fetchAll(PDO::FETCH_COLUMN);
$result->closeCursor();
return $rows;
}
public function reserveEditId($postId) {
throw_if_null($postId);
$sql = 'INSERT INTO posts (post_id) VALUES (' . $postId . ')';
$count = $this->db->exec($sql);
if ($count != 1) {
throw new Exception('Failed to register post id: ' . $postId);
}
return $this->db->lastInsertId();
}
public function registerByEditId($editId, $messageId, $inReplyTo) {
throw_if_null($messageId);
$sql = 'UPDATE posts SET ' .
'message_id = ' . $this->db->quote($messageId) . ', ' .
'in_reply_to = ' . $this->quote($inReplyTo) . ' ' .
'WHERE edit_id = ' . $editId;
$count = $this->db->exec($sql);
return $count == 1;
}
public function registerByMessageId($messageId, $inReplyTo) {
throw_if_null($messageId);
$sql = 'INSERT IGNORE INTO posts ' .
'(message_id, in_reply_to) ' .
'VALUES (' .
$this->db->quote($messageId) . ', ' .
$this->quote($inReplyTo) .
')';
$count = $this->db->exec($sql);
return $count == 1 ? $this->db->lastInsertId() : false;
}
public function unregisterMessage($editId) {
throw_if_null($editId);
$sql = 'DELETE FROM posts WHERE edit_id = ' . $editId;
$count = $this->db->exec($sql);
if ($count != 1) {
throw new Exception('Failed to delete edit id: ' . $editId);
}
}
protected function get_exactly_one_row($sql) {
$result = $this->db->query($sql);
$rows = $result->fetchAll(PDO::FETCH_ASSOC);
$result->closeCursor();
switch (count($rows)) {
case 0:
return false;
case 1:
return $rows[0];
default:
throw new Exception("Too many rows returned: $sql");
}
}
protected function quote($arg) {
return $arg === null ? 'NULL' : $this->db->quote($arg);
}
}
?>
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