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msd2/phpBB3/phpbb/groupposition/legend.php
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243
msd2/phpBB3/phpbb/groupposition/legend.php
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<?php
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/**
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*
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* This file is part of the phpBB Forum Software package.
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*
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* @copyright (c) phpBB Limited <https://www.phpbb.com>
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* @license GNU General Public License, version 2 (GPL-2.0)
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*
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* For full copyright and license information, please see
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* the docs/CREDITS.txt file.
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*
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*/
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namespace phpbb\groupposition;
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/**
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* Legend group position class
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*
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* group_legend is an ascending list 1, 2, ..., n for groups which are displayed. 1 is the first group, n the last.
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* If the value is 0 (self::GROUP_DISABLED) the group is not displayed.
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*/
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class legend implements \phpbb\groupposition\groupposition_interface
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{
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/**
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* Group is not displayed
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*/
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const GROUP_DISABLED = 0;
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/**
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* Database object
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* @var \phpbb\db\driver\driver_interface
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*/
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protected $db;
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/**
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* User object
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* @var \phpbb\user
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*/
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protected $user;
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/**
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* Constructor
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*
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* @param \phpbb\db\driver\driver_interface $db Database object
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* @param \phpbb\user $user User object
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*/
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public function __construct(\phpbb\db\driver\driver_interface $db, \phpbb\user $user)
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{
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$this->db = $db;
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$this->user = $user;
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}
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/**
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* Returns the group_legend for a given group, if the group exists.
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*
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* @param int $group_id group_id of the group to be selected
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* @return int position of the group
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* @throws \phpbb\groupposition\exception
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*/
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public function get_group_value($group_id)
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{
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$sql = 'SELECT group_legend
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FROM ' . GROUPS_TABLE . '
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WHERE group_id = ' . (int) $group_id;
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$result = $this->db->sql_query($sql);
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$current_value = $this->db->sql_fetchfield('group_legend');
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$this->db->sql_freeresult($result);
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if ($current_value === false)
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{
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// Group not found.
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throw new \phpbb\groupposition\exception('NO_GROUP');
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}
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return (int) $current_value;
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}
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/**
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* Get number of groups, displayed on the legend
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*
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* @return int value of the last item displayed
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*/
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public function get_group_count()
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{
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$sql = 'SELECT group_legend
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FROM ' . GROUPS_TABLE . '
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ORDER BY group_legend DESC';
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$result = $this->db->sql_query_limit($sql, 1);
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$group_count = (int) $this->db->sql_fetchfield('group_legend');
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$this->db->sql_freeresult($result);
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return $group_count;
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}
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/**
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* {@inheritDoc}
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*/
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public function add_group($group_id)
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{
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$current_value = $this->get_group_value($group_id);
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if ($current_value == self::GROUP_DISABLED)
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{
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// Group is currently not displayed, add it at the end.
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$next_value = 1 + $this->get_group_count();
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$sql = 'UPDATE ' . GROUPS_TABLE . '
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SET group_legend = ' . $next_value . '
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WHERE group_legend = ' . self::GROUP_DISABLED . '
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AND group_id = ' . (int) $group_id;
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$this->db->sql_query($sql);
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return true;
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}
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return false;
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}
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/**
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* Deletes a group by setting the field to self::GROUP_DISABLED and closing the gap in the list.
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*
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* @param int $group_id group_id of the group to be deleted
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* @param bool $skip_group Skip setting the value for this group, to save the query, when you need to update it anyway.
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* @return bool True if the group was deleted successfully
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*/
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public function delete_group($group_id, $skip_group = false)
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{
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$current_value = $this->get_group_value($group_id);
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if ($current_value != self::GROUP_DISABLED)
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{
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$this->db->sql_transaction('begin');
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$sql = 'UPDATE ' . GROUPS_TABLE . '
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SET group_legend = group_legend - 1
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WHERE group_legend > ' . $current_value;
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$this->db->sql_query($sql);
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if (!$skip_group)
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{
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$sql = 'UPDATE ' . GROUPS_TABLE . '
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SET group_legend = ' . self::GROUP_DISABLED . '
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WHERE group_id = ' . (int) $group_id;
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$this->db->sql_query($sql);
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}
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$this->db->sql_transaction('commit');
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return true;
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}
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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public function move_up($group_id)
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{
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return $this->move($group_id, 1);
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}
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/**
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* {@inheritDoc}
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*/
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public function move_down($group_id)
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{
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return $this->move($group_id, -1);
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}
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/**
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* {@inheritDoc}
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*/
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public function move($group_id, $delta)
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{
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$delta = (int) $delta;
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if (!$delta)
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{
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return false;
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}
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$move_up = ($delta > 0) ? true : false;
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$current_value = $this->get_group_value($group_id);
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if ($current_value != self::GROUP_DISABLED)
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{
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$this->db->sql_transaction('begin');
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// First we move all groups between our current value and the target value up/down 1,
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// so we have a gap for our group to move.
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$sql = 'UPDATE ' . GROUPS_TABLE . '
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SET group_legend = group_legend' . (($move_up) ? ' + 1' : ' - 1') . '
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WHERE group_legend > ' . self::GROUP_DISABLED . '
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AND group_legend' . (($move_up) ? ' >= ' : ' <= ') . ($current_value - $delta) . '
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AND group_legend' . (($move_up) ? ' < ' : ' > ') . $current_value;
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$this->db->sql_query($sql);
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// Because there might be fewer groups above/below the group than we wanted to move,
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// we use the number of changed groups, to update the group.
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$delta = (int) $this->db->sql_affectedrows();
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if ($delta)
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{
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// And now finally, when we moved some other groups and built a gap,
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// we can move the desired group to it.
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$sql = 'UPDATE ' . GROUPS_TABLE . '
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SET group_legend = group_legend ' . (($move_up) ? ' - ' : ' + ') . $delta . '
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WHERE group_id = ' . (int) $group_id;
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$this->db->sql_query($sql);
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$this->db->sql_transaction('commit');
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return true;
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}
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$this->db->sql_transaction('commit');
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}
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return false;
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}
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/**
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* Get group type language var
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*
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* @param int $group_type group_type from the groups-table
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* @return string name of the language variable for the given group-type.
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*/
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static public function group_type_language($group_type)
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{
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switch ($group_type)
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{
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case GROUP_OPEN:
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return 'GROUP_REQUEST';
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case GROUP_CLOSED:
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return 'GROUP_CLOSED';
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case GROUP_HIDDEN:
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return 'GROUP_HIDDEN';
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case GROUP_SPECIAL:
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return 'GROUP_SPECIAL';
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case GROUP_FREE:
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return 'GROUP_OPEN';
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}
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}
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}
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