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<?php
class TTypeHandlerFactory
{
private $_typeHandlerMap;
const NullDbType = '__NULL__';
public function __construct()
{
$this->_typeHandlerMap = new TMap;
}
public function getTypeHandler($type, $dbType=null)
{
$dbTypeHandlerMap = $this->_typeHandlerMap[$type];
$handler = null;
if(!is_null($dbTypeHandlerMap))
{
if(is_null($dbType))
$handler = $dbTypeHandlerMap[self::NullDbType];
else
{
$handler = $dbTypeHandlerMap[$dbType];
if(is_null($handler))
$handler = $dbTypeHandlerMap[self::NullDbType];
}
}
return $handler;
}
public function register($type, $handler, $dbType=null)
{
$map = $this->_typeHandlerMap[$type];
if(is_null($map))
{
$map = new TMap;
$this->_typeHandlerMap->add($type, $map);
}
if(is_null($dbType))
$map->add(self::NullDbType, $handler);
else
$map->add($dbType, $handler);
}
public static function createInstanceOf($type)
{
if(strlen($type) > 0)
{
switch(strtolower($type))
{
case 'string': return '';
case 'array': return array();
case 'float': case 'double': case 'decimal': return 0.0;
case 'integer': case 'int': return 0;
case 'bool': case 'boolean': return false;
}
if(class_exists('Prado', false))
return Prado::createComponent($type);
else if(class_exists($type, false)) //NO auto loading
return new $type;
else
throw new TDataMapperException('sqlmap_unable_to_find_class', $type);
}
return null;
}
public static function convertToType($type, $value)
{
switch(strtolower($type))
{
case 'integer': case 'int':
$type = 'integer'; break;
case 'float': case 'double': case 'decimal':
$type = 'float'; break;
case 'boolean': case 'bool':
$type = 'boolean'; break;
case 'string' :
$type = 'string'; break;
default:
return $value;
}
settype($value, $type);
return $value;
}
}
/**
* A simple interface for implementing custom type handlers.
*
* Using this interface, you can implement a type handler that
* will perform customized processing before parameters are set
* on and after values are retrieved from the database.
* Using a custom type handler you can extend
* the framework to handle types that are not supported, or
* handle supported types in a different way. For example,
* you might use a custom type handler to implement proprietary
* BLOB support (e.g. Oracle), or you might use it to handle
* booleans using "Y" and "N" instead of the more typical 0/1.
*/
interface ITypeHandlerCallback
{
/**
* Performs processing on a value before it is used to set
* the parameter of a IDbCommand.
* @param object The interface for setting the value.
* @param object The value to be set.
*/
public function getParameter($object);
/**
* Performs processing on a value before after it has been retrieved
* from a database
* @param object The interface for getting the value.
* @return mixed The processed value.
*/
public function getResult($string);
/**
* Casts the string representation of a value into a type recognized by
* this type handler. This method is used to translate nullValue values
* into types that can be appropriately compared. If your custom type handler
* cannot support nullValues, or if there is no reasonable string representation
* for this type (e.g. File type), you can simply return the String representation
* as it was passed in. It is not recommended to return null, unless null was passed
* in.
* @param array result row.
* @return mixed
*/
public function createNewInstance($row=null);
}
?>
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