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<?php
/*
Copyright (c) 2001 - 2007 Ampache.org
All rights reserved.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/**
* Browse Class
* This handles all of the sql/filtering
* on the data before it's thrown out to the templates
* it also handles pulling back the object_ids and then
* calling the correct template for the object we are displaying
*/
class Browse {
// Public static vars that are cached
public static $sql;
/**
* constructor
* This should never be called
*/
private function __construct() {
// Rien a faire
} // __construct
/**
* set_filter
* This saves the filter data we pass it into the session
* This is done here so that it's easy to modify where the data
* is saved should I change my mind in the future. It also makes
* a single point for whitelist tweaks etc
*/
public static function set_filter($key,$value) {
switch ($key) {
case 'show_art':
case 'min_count':
case 'unplayed':
case 'rated':
$key = $_REQUEST['key'];
if ($_SESSION['browse']['filter'][$key]) {
unset($_SESSION['browse']['filter'][$key]);
}
else {
$_SESSION['browse']['filter'][$key] = 1;
}
break;
default:
// Rien a faire
break;
} // end switch
} // set_filter
/**
* set_type
* This sets the type of object that we want to browse by
* we do this here so we only have to maintain a single whitelist
* and if I want to change the location I only have to do it here
*/
public static function set_type($type) {
switch($type) {
case 'song':
case 'album':
case 'artist':
case 'genre':
$_SESSION['browse']['type'] = $type;
break;
default:
// Rien a faire
break;
} // end type whitelist
} // set_type
/**
* get_objects
* This gets an array of the ids of the objects that we are
* currently browsing by it applies the sql and logic based
* filters
*/
public static function get_objects() {
// First we need to get the SQL statement we are going to run
// This has to run against any possible filters (dependent on type)
$sql = self::get_sql();
$db_results = Dba::query($sql);
$results = array();
while ($data = Dba::fetch_assoc($db_results)) {
// If we've hit our offset limit
if (count($results) >= $GLOBALS['user']->prefs['offset_limit']) { return $results; }
// Make sure that this object passes the logic filter
if (self::logic_filter($data['id'])) {
$results[] = $data['id'];
}
} // end while
return $results;
} // get_objects
/**
* get_sql
* This returns the sql statement we are going to use this has to be run
* every time we get the objects because it depends on the filters and the
* type of object we are currently browsing
*/
public static function get_sql() {
// Get our base SQL must always return ID
switch ($_SESSION['browse']['type']) {
case 'album':
break;
case 'artist':
break;
case 'genre':
break;
case 'song':
default:
$sql = "SELECT `song`.`id` FROM `song` ";
break;
} // end base sql
// No sense to go further if we don't have filters
if (!is_array($_SESSION['browse']['filter'])) { return $sql; }
// Foreach the filters and see if any of them can be applied
// as part of a where statement in this sql (type dependent)
$where_sql = "WHERE 1=1 AND ";
foreach ($_SESSION['browse']['filter'] as $key=>$value) {
$where_sql .= self::sql_filter($key,$value);
} // end foreach
$where_sql = rtrim($where_sql,'AND ');
$sql .= $where_sql;
self::$sql = $sql;
return $sql;
} // get_sql
/**
* sql_filter
* This takes a filter name and value and if it is possible
* to filter by this name on this type returns the approiate sql
* if not returns nothing
*/
private static function sql_filter($filter,$value) {
$filter_sql = '';
if ($_SESSION['browse']['type'] == 'song') {
switch($filter) {
case 'alpha_match':
$filter_sql = " `song`.`title` LIKE '" . Dba::escape($value) . "%' AND ";
break;
case 'unplayed':
$filter_sql = " `song`.`played`='0' AND ";
break;
default:
// Rien a faire
break;
} // end list of sqlable filters
} // if it is a song
if ($_SESSION['browse']['type'] == 'album') {
} // end album
return $filter_sql;
} // sql_filter
/**
* logic_filter
* This runs the filters that we can't easily apply
* to the sql so they have to be done after the fact
* these should be limited as they are often intensive and
* require additional queries per object... :(
*/
private static function logic_filter($object_id) {
return true;
} // logic_filter
/**
* show_objects
* This takes an array of objects
* and requires the correct template based on the
* type that we are currently browsing
*/
public static function show_objects($object_ids) {
switch ($_SESSION['browse']['type']) {
case 'song':
show_box_top();
require_once Config::get('prefix') . '/templates/show_songs.inc.php';
show_box_bottom();
break;
} // end switch on type
} // show_object
} // browse
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