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<?php
/**
* CArrayDataProvider class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CArrayDataProvider implements a data provider based on a raw data array.
*
* The {@link rawData} property contains all data that may be sorted and/or paginated.
* CArrayDataProvider will supply the data after sorting and/or pagination.
* You may configure the {@link sort} and {@link pagination} properties to
* customize sorting and pagination behaviors.
*
* Elements in the raw data array may be either objects (e.g. model objects)
* or associative arrays (e.g. query results of DAO).
*
* CArrayDataProvider may be used in the following way:
* <pre>
* $rawData=Yii::app()->db->createCommand('SELECT * FROM tbl_user')->queryAll();
* // or using: $rawData=User::model()->findAll();
* $dataProvider=new CArrayDataProvider($rawData, array(
* 'id'=>'user',
* 'sort'=>array(
* 'attributes'=>array(
* 'id', 'username', 'email',
* ),
* ),
* 'pagination'=>array(
* 'pageSize'=>10,
* ),
* ));
* // $dataProvider->getData() will return a list of arrays.
* </pre>
*
* Note: if you want to use the sorting feature, you must configure {@link sort} property
* so that the provider knows which columns can be sorted.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web
* @since 1.1.4
*/
class CArrayDataProvider extends CDataProvider
{
/**
* @var string the name of key field. Defaults to 'id'. If it's set to false,
* keys of $rawData array are used.
*/
public $keyField='id';
/**
* @var array the data that is not paginated or sorted. When pagination is enabled,
* this property usually contains more elements than {@link data}.
* The array elements must use zero-based integer keys.
*/
public $rawData=array();
/**
* Constructor.
* @param array $rawData the data that is not paginated or sorted. The array elements must use zero-based integer keys.
* @param array $config configuration (name=>value) to be applied as the initial property values of this class.
*/
public function __construct($rawData,$config=array())
{
$this->rawData=$rawData;
foreach($config as $key=>$value)
$this->$key=$value;
}
/**
* Fetches the data from the persistent data storage.
* @return array list of data items
*/
protected function fetchData()
{
if(($sort=$this->getSort())!==false && ($order=$sort->getOrderBy())!='')
$this->sortData($this->getSortDirections($order));
if(($pagination=$this->getPagination())!==false)
{
$pagination->setItemCount($this->getTotalItemCount());
return array_slice($this->rawData, $pagination->getOffset(), $pagination->getLimit());
}
else
return $this->rawData;
}
/**
* Fetches the data item keys from the persistent data storage.
* @return array list of data item keys.
*/
protected function fetchKeys()
{
if($this->keyField===false)
return array_keys($this->rawData);
$keys=array();
foreach($this->getData() as $i=>$data)
$keys[$i]=is_object($data) ? $data->{$this->keyField} : $data[$this->keyField];
return $keys;
}
/**
* Calculates the total number of data items.
* This method simply returns the number of elements in {@link rawData}.
* @return integer the total number of data items.
*/
protected function calculateTotalItemCount()
{
return count($this->rawData);
}
/**
* Sorts the raw data according to the specified sorting instructions.
* After calling this method, {@link rawData} will be modified.
* @param array $directions the sorting directions (field name => whether it is descending sort)
*/
protected function sortData($directions)
{
if(empty($directions))
return;
$args=array();
$dummy=array();
foreach($directions as $name=>$descending)
{
$column=array();
$fields_array=preg_split('/\.+/',$name,-1,PREG_SPLIT_NO_EMPTY);
foreach($this->rawData as $index=>$data)
$column[$index]=$this->getSortingFieldValue($data, $fields_array);
$args[]=&$column;
$dummy[]=&$column;
unset($column);
$direction=$descending ? SORT_DESC : SORT_ASC;
$args[]=&$direction;
$dummy[]=&$direction;
unset($direction);
}
$args[]=&$this->rawData;
call_user_func_array('array_multisort', $args);
}
/**
* Get field for sorting, using dot like delimiter in query.
* @param mixed $data array or object
* @param array $fields sorting fields in $data
* @return mixed $data sorting field value
*/
protected function getSortingFieldValue($data, $fields)
{
foreach ($fields as $field)
{
$data = is_object($data) ? $data->$field : $data[$field];
}
return $data;
}
/**
* Converts the "ORDER BY" clause into an array representing the sorting directions.
* @param string $order the "ORDER BY" clause.
* @return array the sorting directions (field name => whether it is descending sort)
*/
protected function getSortDirections($order)
{
$segs=explode(',',$order);
$directions=array();
foreach($segs as $seg)
{
if(preg_match('/(.*?)(\s+(desc|asc))?$/i',trim($seg),$matches))
$directions[$matches[1]]=isset($matches[3]) && !strcasecmp($matches[3],'desc');
else
$directions[trim($seg)]=false;
}
return $directions;
}
}
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