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<?php
/**
* TLazyLoadList, TObjectProxy classes file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.SqlMap
*/
/**
* TLazyLoadList executes mapped statements when the proxy collection is first accessed.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
class TLazyLoadList
{
private $_param;
private $_target;
private $_propertyName='';
private $_statement='';
private $_loaded=false;
private $_innerList;
private $_connection;
/**
* Create a new proxy list that will execute the mapped statement when any
* of the list's method are accessed for the first time.
* @param TMappedStatement statement to be executed to load the data.
* @param mixed parameter value for the statement.
* @param object result object that contains the lazy collection.
* @param string property of the result object to set the loaded collection.
*/
protected function __construct($mappedStatement, $param, $target, $propertyName)
{
$this->_param = $param;
$this->_target = $target;
$this->_statement = $mappedStatement;
$this->_connection=$mappedStatement->getManager()->getDbConnection();
$this->_propertyName = $propertyName;
}
/**
* Create a new instance of a lazy collection.
* @param TMappedStatement statement to be executed to load the data.
* @param mixed parameter value for the statement.
* @param object result object that contains the lazy collection.
* @param string property of the result object to set the loaded collection.
* @return TObjectProxy proxied collection object.
*/
public static function newInstance($mappedStatement, $param, $target, $propertyName)
{
$handler = new self($mappedStatement, $param, $target, $propertyName);
$statement = $mappedStatement->getStatement();
$registry=$mappedStatement->getManager()->getTypeHandlers();
$list = $statement->createInstanceOfListClass($registry);
if(!is_object($list))
throw new TSqlMapExecutionException('sqlmap_invalid_lazyload_list',$statement->getID());
return new TObjectProxy($handler, $list);
}
/**
* Relay the method call to the underlying collection.
* @param string method name.
* @param array method parameters.
*/
public function intercept($method, $arguments)
{
return call_user_func_array(array($this->_innerList, $method), $arguments);
}
/**
* Load the data by executing the mapped statement.
*/
protected function fetchListData()
{
if($this->_loaded == false)
{
$this->_innerList = $this->_statement->executeQueryForList($this->_connection,$this->_param);
$this->_loaded = true;
//replace the target property with real list
TPropertyAccess::set($this->_target, $this->_propertyName, $this->_innerList);
}
}
/**
* Try to fetch the data when any of the proxy collection method is called.
* @param string method name.
* @return boolean true if the underlying collection has the corresponding method name.
*/
public function hasMethod($method)
{
$this->fetchListData();
if(is_object($this->_innerList))
return in_array($method, get_class_methods($this->_innerList));
return false;
}
}
/**
* TObjectProxy sets up a simple object that intercepts method calls to a
* particular object and relays the call to handler object.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
class TObjectProxy
{
private $_object;
private $_handler;
/**
* @param object handler to method calls.
* @param object the object to by proxied.
*/
public function __construct($handler, $object)
{
$this->_handler = $handler;
$this->_object = $object;
}
/**
* Relay the method call to the handler object (if able to be handled), otherwise
* it calls the proxied object's method.
* @param string method name called
* @param array method arguments
* @return mixed method return value.
*/
public function __call($method,$params)
{
if($this->_handler->hasMethod($method))
return $this->_handler->intercept($method, $params);
else
return call_user_func_array(array($this->_object, $method), $params);
}
}
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