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<?php
/**
* Data Object Cache Class
*
* "data objects by fplanque" :P
*
* b2evolution - {@link http://b2evolution.net/}
* Released under GNU GPL License - {@link http://b2evolution.net/about/license.html}
* @copyright (c)2003-2005 by Francois PLANQUE - {@link http://fplanque.net/}
*
* @package evocore
*/
if( !defined('DB_USER') ) die( 'Please, do not access this page directly.' );
/**
* Data Object Cache Class
*
* @package evocore
* @version beta
*/
class DataObjectCache
{
/**#@+
* @access private
*/
var $objtype;
var $dbtablename;
var $dbprefix;
var $dbIDname;
var $cache = array();
var $load_add = false;
var $all_loaded = false;
/**#@-*/
/**
* Constructor
*
* {@internal DataObjectCache::DataObjectCache(-) }}
*
* @param string Name of DataObject class we are cacheing
* @param boolean true if it's OK to just load all items!
* @param string Name of table in database
* @param string Prefix of fields in the table
* @param string Name of the ID field (including prefix)
*/
function DataObjectCache( $objtype, $load_all, $tablename, $prefix = '', $dbIDname = 'ID' )
{
$this->objtype = $objtype;
$this->load_all = $load_all;
$this->dbtablename = $tablename;
$this->dbprefix = $prefix;
$this->dbIDname = $dbIDname;
}
/**
* Load the cache **extensively**
*
* {@internal DataObjectCache::load_all(-) }}
*/
function load_all()
{
global $DB;
if( $this->all_loaded )
return false; // Already loaded;
debug_log( "Loading <strong>$this->objtype(ALL)</strong> into cache" );
$sql = "SELECT * FROM $this->dbtablename";
$rows = $DB->get_results( $sql );
$dbIDname = $this->dbIDname;
$objtype = $this->objtype;
if( count($rows) ) foreach( $rows as $row )
{
$this->cache[ $row->$dbIDname ] = new $objtype( $row ); // COPY!
// $obj = $this->cache[ $row->$dbIDname ];
// $obj->disp( 'name' );
}
$this->all_loaded = true;
return true;
}
/**
* Load a list of objects into the cache
*
* {@internal DataObjectCache::load_list(-) }}
*
* @param string list of IDs of objects to load
*/
function load_list( $req_list )
{
global $DB;
debug_log( "Loading <strong>$this->objtype($req_list)</strong> into cache" );
$sql = "SELECT * FROM $this->dbtablename WHERE $this->dbIDname IN ($req_list)";
$rows = $DB->get_results( $sql );
$dbIDname = $this->dbIDname;
$objtype = $this->objtype;
if( count($rows) ) foreach( $rows as $row )
{
$this->cache[ $row->$dbIDname ] = new $objtype( $row ); // COPY!
// $obj = $this->cache[ $row->$dbIDname ];
// $obj->disp( 'name' );
}
}
/**
* Add a dataobject to the cache
*
* {@internal DataObjectCache::add(-) }}
*/
function add( & $Obj )
{
if( isset($Obj->ID) && $Obj->ID != 0 )
{
$this->cache[$Obj->ID] = & $Obj;
return true;
}
return false;
}
/**
* Clear the cache **extensively**
*
* {@internal DataObjectCache::clear(-) }}
*/
function clear()
{
$this->cache = array();
$this->all_loaded = false;
}
/**
* Get an object from cache by ID
*
* Load the cache if necessary
*
* {@internal DataObjectCache::get_by_ID(-) }}
*
* @param integer ID of object to load
* @param boolean false if you want to return false on error
*/
function get_by_ID( $req_ID, $halt_on_error = true )
{
global $DB;
if( !empty( $this->cache[ $req_ID ] ) )
{ // Already in cache
// debug_log( "Accessing $this->objtype($req_ID) from cache" );
return $this->cache[ $req_ID ];
}
elseif( !$this->all_loaded )
{ // Not in cache, but not everything is loaded yet
if( $this->load_all )
{ // It's ok to just load everything:
$this->load_all();
}
else
{ // Load just the requested object:
debug_log( "Loading <strong>$this->objtype($req_ID)</strong> into cache" );
$sql = "SELECT * FROM $this->dbtablename WHERE $this->dbIDname = $req_ID";
$row = $DB->get_row( $sql );
$dbIDname = $this->dbIDname;
$objtype = $this->objtype;
$this->cache[ $row->$dbIDname ] = new $objtype( $row ); // COPY!
}
}
if( empty( $this->cache[ $req_ID ] ) )
{ // Requested object does not exist
if( $halt_on_error ) die( "Requested $this->objtype does not exist!" );
return false;
}
return $this->cache[ $req_ID ];
}
/**
* Display form option list with cache contents
*
* Load the cache if necessary
*
* {@internal DataObjectCache::get_by_ID(-) }}
*
* @param integer selected ID
* @param boolean provide a choice for "none" with ID 0
*/
function option_list( $default = 0, $allow_none = false )
{
global $cache_Groups;
if( ! $this->all_loaded )
$this->load_all();
if( $allow_none )
{
echo '<option value="0"';
if( 0 == $default ) echo ' selected="selected"';
echo '>', T_('None') ,'</option>'."\n";
}
foreach( $this->cache as $loop_Obj )
{
echo '<option value="'.$loop_Obj->ID.'"';
if( $loop_Obj->ID == $default ) echo ' selected="selected"';
echo '>';
$loop_Obj->disp( 'name' );
echo '</option>'."\n";
}
}
}
?>
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