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<?php
/**
* Object Relational Mapping (ORM) "versioned" extension. Allows ORM objects to
* be revisioned instead of updated.
*
* $Id$
*
* @package ORM
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class ORM_Versioned extends ORM {

protected $last_version = NULL;

/**
* Overload ORM::save() to support versioned data
*
* @chainable
* @return ORM
*/
public function save()
{
$this->last_version = 1 + ($this->last_version === NULL ? $this->object['version'] : $this->last_version);
$this->__set('version', $this->last_version);

parent::save();

if ($this->saved)
{
$data = array();
foreach ($this->object as $key => $value)
{
if ($key === 'id')
continue;

$data[$key] = $value;
}
$data[$this->foreign_key()] = $this->id;

$this->db->insert($this->table_name.'_versions', $data);
}

return $this;
}

/**
* Loads previous version from current object
*
* @chainable
* @return ORM
*/
public function previous()
{
if ( ! $this->loaded)
return $this;

$this->last_version = ($this->last_version === NULL) ? $this->object['version'] : $this->last_version;
$version = $this->last_version - 1;

$query = $this->db
->where($this->foreign_key(), $this->object[$this->primary_key])
->where('version', $version)
->limit(1)
->get($this->table_name.'_versions');

if ($query->count())
{
$this->load_values($query->result(FALSE)->current());
}

return $this;
}

/**
* Restores the object with data from stored version
*
* @param integer version number you want to restore
* @return ORM
*/
public function restore($version)
{
if ( ! $this->loaded)
return $this;

$query = $this->db
->where($this->foreign_key(), $this->object[$this->primary_key])
->where('version', $version)
->limit(1)
->get($this->table_name.'_versions');

if ($query->count())
{
$row = $query->result(FALSE)->current();

foreach ($row as $key => $value)
{
if ($key === $this->primary_key OR $key === $this->foreign_key())
{
// Do not overwrite the primary key
continue;
}

if ($key === 'version')
{
// Always use the current version
$value = $this->version;
}

$this->__set($key, $value);
}

$this->save();
}

return $this;
}

/**
* Overloads ORM::delete() to delete all versioned entries of current object
* and the object itself
*
* @param integer id of the object you want to delete
* @return ORM
*/
public function delete($id = NULL)
{
if ($id === NULL)
{
// Use the current object id
$id = $this->object[$this->primary_key];
}

if ($status = parent::delete($id))
{
$this->db->where($this->foreign_key(), $id)->delete($this->table_name.'_versions');
}

return $status;
}

}
(14-14/22)