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<?php
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/**
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* TSqlMapTypeHandlerRegistry, and abstract TSqlMapTypeHandler classes file.
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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* @link http://www.pradosoft.com/
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* @copyright Copyright © 2005-2008 PradoSoft
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* @license http://www.pradosoft.com/license/
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* @version $Id: TSqlMapTypeHandlerRegistry.php 2541 2008-10-21 15:05:13Z qiang.xue $
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* @package System.Data.SqlMap
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*/
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/**
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* TTypeHandlerFactory provides type handler classes to convert database field type
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* to PHP types and vice versa.
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*
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* @author Wei Zhuo <weizho[at]gmail[dot]com>
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* @version $Id: TSqlMapTypeHandlerRegistry.php 2541 2008-10-21 15:05:13Z qiang.xue $
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* @package System.Data.SqlMap
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* @since 3.1
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*/
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class TSqlMapTypeHandlerRegistry
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{
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private $_typeHandlers=array();
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/**
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* @param string database field type
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* @return TSqlMapTypeHandler type handler for give database field type.
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*/
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public function getDbTypeHandler($dbType='NULL')
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{
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foreach($this->_typeHandlers as $handler)
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if($handler->getDbType()===$dbType)
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return $handler;
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}
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/**
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* @param string type handler class name
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* @return TSqlMapTypeHandler type handler
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*/
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public function getTypeHandler($class)
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{
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if(isset($this->_typeHandlers[$class]))
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return $this->_typeHandlers[$class];
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}
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/**
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* @param TSqlMapTypeHandler registers a new type handler
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*/
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public function registerTypeHandler(TSqlMapTypeHandler $handler)
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{
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$this->_typeHandlers[$handler->getType()] = $handler;
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}
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/**
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* Creates a new instance of a particular class (for PHP primative types,
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* their corresponding default value for given type is used).
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* @param string PHP type name
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* @return mixed default type value, if no type is specified null is returned.
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* @throws TSqlMapException if class name is not found.
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*/
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public function createInstanceOf($type='')
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{
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if(strlen($type) > 0)
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{
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switch(strtolower($type))
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{
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case 'string': return '';
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case 'array': return array();
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case 'float': case 'double': case 'decimal': return 0.0;
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case 'integer': case 'int': return 0;
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case 'bool': case 'boolean': return false;
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}
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if(class_exists('Prado', false))
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return Prado::createComponent($type);
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else if(class_exists($type, false)) //NO auto loading
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return new $type;
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else
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throw new TSqlMapException('sqlmap_unable_to_find_class', $type);
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}
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}
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/**
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* Converts the value to given type using PHP's settype() function.
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* @param string PHP primative type.
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* @param mixed value to be casted
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* @return mixed type casted value.
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*/
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public function convertToType($type, $value)
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{
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switch(strtolower($type))
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{
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case 'integer': case 'int':
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$type = 'integer'; break;
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case 'float': case 'double': case 'decimal':
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$type = 'float'; break;
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case 'boolean': case 'bool':
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$type = 'boolean'; break;
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case 'string' :
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$type = 'string'; break;
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default:
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return $value;
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}
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settype($value, $type);
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return $value;
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}
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}
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/**
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* A simple interface for implementing custom type handlers.
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*
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* Using this interface, you can implement a type handler that
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* will perform customized processing before parameters are set
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* on and after values are retrieved from the database.
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* Using a custom type handler you can extend
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* the framework to handle types that are not supported, or
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* handle supported types in a different way. For example,
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* you might use a custom type handler to implement proprietary
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* BLOB support (e.g. Oracle), or you might use it to handle
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* booleans using "Y" and "N" instead of the more typical 0/1.
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*
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* @author Wei Zhuo <weizho[at]gmail[dot]com>
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* @version $Id: TSqlMapTypeHandlerRegistry.php 2541 2008-10-21 15:05:13Z qiang.xue $
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* @package System.Data.SqlMap
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* @since 3.1
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*/
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abstract class TSqlMapTypeHandler extends TComponent
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{
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private $_dbType='NULL';
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private $_type;
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/**
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* @param string database field type.
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*/
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public function setDbType($value)
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{
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$this->_dbType=$value;
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}
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/**
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* @return string database field type.
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*/
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public function getDbType()
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{
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return $this->_dbType;
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}
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public function getType()
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{
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if($this->_type===null)
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return get_class($this);
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else
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return $this->_type;
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}
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public function setType($value)
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{
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$this->_type=$value;
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}
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/**
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* Performs processing on a value before it is used to set
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* the parameter of a IDbCommand.
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* @param object The interface for setting the value.
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* @param object The value to be set.
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*/
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public abstract function getParameter($object);
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/**
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* Performs processing on a value before after it has been retrieved
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* from a database
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* @param object The interface for getting the value.
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* @return mixed The processed value.
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*/
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public abstract function getResult($string);
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/**
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* Casts the string representation of a value into a type recognized by
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* this type handler. This method is used to translate nullValue values
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* into types that can be appropriately compared. If your custom type handler
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* cannot support nullValues, or if there is no reasonable string representation
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* for this type (e.g. File type), you can simply return the String representation
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* as it was passed in. It is not recommended to return null, unless null was passed
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* in.
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* @param array result row.
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* @return mixed
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*/
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public abstract function createNewInstance($row=null);
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}
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