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<?php
/**
* TDataFieldAccessor class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Util
*/
/**
* TDataFieldAccessor class
*
* TDataFieldAccessor is a utility class that provides access to a field of some data.
* The accessor attempts to obtain the field value in the following order:
* - If the data is an array, then the field is treated as an array index
* and the corresponding element value is returned;
* - If the data is a TMap or TList object, then the field is treated as a key
* into the map or list, and the corresponding value is returned.
* - If the data is an object, the field is treated as a property or sub-property
* defined with getter methods. For example, if the object has a method called
* getMyValue(), then field 'MyValue' will retrieve the result of this method call.
* If getMyValue() returns an object which contains a method getMySubValue(),
* then field 'MyValue.MySubValue' will return that method call result.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package System.Util
* @since 3.0
*/
class TDataFieldAccessor
{
/**
* Evaluates the data value at the specified field.
* - If the data is an array, then the field is treated as an array index
* and the corresponding element value is returned;
* - If the data is a TMap or TList object, then the field is treated as a key
* into the map or list, and the corresponding value is returned.
* - If the data is an object, the field is treated as a property or sub-property
* defined with getter methods. For example, if the object has a method called
* getMyValue(), then field 'MyValue' will retrieve the result of this method call.
* If getMyValue() returns an object which contains a method getMySubValue(),
* then field 'MyValue.MySubValue' will return that method call result.
* @param mixed data containing the field value, can be an array, TMap, TList or object.
* @param mixed field value
* @return mixed value at the specified field
* @throws TInvalidDataValueException if field or data is invalid
*/
public static function getDataFieldValue($data,$field)
{
try
{
if(is_array($data) || ($data instanceof ArrayAccess))
return $data[$field];
else if(is_object($data))
{
if(strpos($field,'.')===false) // simple field
{
if(property_exists($data,$field))
return $data->{$field};
else
return call_user_func(array($data,'get'.$field));
}
else // field in the format of xxx.yyy.zzz
{
$object=$data;
foreach(explode('.',$field) as $f)
$object = TDataFieldAccessor::getDataFieldValue($object, $f);
return $object;
}
}
}
catch(Exception $e)
{
throw new TInvalidDataValueException('datafieldaccessor_datafield_invalid',$field,$e->getMessage());
}
throw new TInvalidDataValueException('datafieldaccessor_data_invalid',$field);
}
}
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