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<?php
/**
* TSqlMapTypeHandlerRegistry, and abstract TSqlMapTypeHandler classes file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package System.Data.SqlMap
*/
/**
* TTypeHandlerFactory provides type handler classes to convert database field type
* to PHP types and vice versa.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @package System.Data.SqlMap
* @since 3.1
*/
class TSqlMapTypeHandlerRegistry
{
private $_typeHandlers=array();
/**
* @param string database field type
* @return TSqlMapTypeHandler type handler for give database field type.
*/
public function getDbTypeHandler($dbType='NULL')
{
foreach($this->_typeHandlers as $handler)
if($handler->getDbType()===$dbType)
return $handler;
}
/**
* @param string type handler class name
* @return TSqlMapTypeHandler type handler
*/
public function getTypeHandler($class)
{
if(isset($this->_typeHandlers[$class]))
return $this->_typeHandlers[$class];
}
/**
* @param TSqlMapTypeHandler registers a new type handler
*/
public function registerTypeHandler(TSqlMapTypeHandler $handler)
{
$this->_typeHandlers[$handler->getType()] = $handler;
}
/**
* Creates a new instance of a particular class (for PHP primative types,
* their corresponding default value for given type is used).
* @param string PHP type name
* @return mixed default type value, if no type is specified null is returned.
* @throws TSqlMapException if class name is not found.
*/
public function createInstanceOf($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 TSqlMapException('sqlmap_unable_to_find_class', $type);
}
}
/**
* Converts the value to given type using PHP's settype() function.
* @param string PHP primative type.
* @param mixed value to be casted
* @return mixed type casted value.
*/
public function convertToType($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.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @package System.Data.SqlMap
* @since 3.1
*/
abstract class TSqlMapTypeHandler extends TComponent
{
private $_dbType='NULL';
private $_type;
/**
* @param string database field type.
*/
public function setDbType($value)
{
$this->_dbType=$value;
}
/**
* @return string database field type.
*/
public function getDbType()
{
return $this->_dbType;
}
public function getType()
{
if($this->_type===null)
return get_class($this);
else
return $this->_type;
}
public function setType($value)
{
$this->_type=$value;
}
/**
* 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 abstract function getParameter($object);
/**
* Performs processing on a value before after it has been retrieved
* from a database
* @param object The interface for getting the value.
* @return mixed The processed value.
*/
public abstract function getResult($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 abstract function createNewInstance($row=null);
}
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