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<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* Object Relational Mapping (ORM) result iterator.
*
* $Id: ORM_Iterator.php 3769 2008-12-15 00:48:56Z zombor $
*
* @package ORM
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class ORM_Iterator implements Iterator, ArrayAccess, Countable {

// Class attributes
protected $class_name;
protected $primary_key;
protected $primary_val;

// Database result object
protected $result;

public function __construct(ORM $model, Database_Result $result)
{
// Class attributes
$this->class_name = get_class($model);
$this->primary_key = $model->primary_key;
$this->primary_val = $model->primary_val;

// Database result
$this->result = $result->result(TRUE);
}

/**
* Returns an array of the results as ORM objects.
*
* @return array
*/
public function as_array()
{
$array = array();

if ($results = $this->result->result_array())
{
// Import class name
$class = $this->class_name;

foreach ($results as $obj)
{
$array[] = new $class($obj);
}
}

return $array;
}

/**
* Return an array of all of the primary keys for this object.
*
* @return array
*/
public function primary_key_array()
{
$ids = array();
foreach ($this->result as $row)
{
$ids[] = $row->{$this->primary_key};
}
return $ids;
}

/**
* Create a key/value array from the results.
*
* @param string key column
* @param string value column
* @return array
*/
public function select_list($key = NULL, $val = NULL)
{
if ($key === NULL)
{
// Use the default key
$key = $this->primary_key;
}

if ($val === NULL)
{
// Use the default value
$val = $this->primary_val;
}

$array = array();
foreach ($this->result->result_array() as $row)
{
$array[$row->$key] = $row->$val;
}
return $array;
}

/**
* Return a range of offsets.
*
* @param integer start
* @param integer end
* @return array
*/
public function range($start, $end)
{
// Array of objects
$array = array();

if ($this->result->offsetExists($start))
{
// Import the class name
$class = $this->class_name;

// Set the end offset
$end = $this->result->offsetExists($end) ? $end : $this->count();

for ($i = $start; $i < $end; $i++)
{
// Insert each object in the range
$array[] = new $class($this->result->offsetGet($i));
}
}

return $array;
}

/**
* Countable: count
*/
public function count()
{
return $this->result->count();
}

/**
* Iterator: current
*/
public function current()
{
if ($row = $this->result->current())
{
// Import class name
$class = $this->class_name;

$row = new $class($row);
}

return $row;
}

/**
* Iterator: key
*/
public function key()
{
return $this->result->key();
}

/**
* Iterator: next
*/
public function next()
{
return $this->result->next();
}

/**
* Iterator: rewind
*/
public function rewind()
{
$this->result->rewind();
}

/**
* Iterator: valid
*/
public function valid()
{
return $this->result->valid();
}

/**
* ArrayAccess: offsetExists
*/
public function offsetExists($offset)
{
return $this->result->offsetExists($offset);
}

/**
* ArrayAccess: offsetGet
*/
public function offsetGet($offset)
{
if ($this->result->offsetExists($offset))
{
// Import class name
$class = $this->class_name;

return new $class($this->result->offsetGet($offset));
}
}

/**
* ArrayAccess: offsetSet
*
* @throws Kohana_Database_Exception
*/
public function offsetSet($offset, $value)
{
throw new Kohana_Database_Exception('database.result_read_only');
}

/**
* ArrayAccess: offsetUnset
*
* @throws Kohana_Database_Exception
*/
public function offsetUnset($offset)
{
throw new Kohana_Database_Exception('database.result_read_only');
}

} // End ORM Iterator
(12-12/22)