From 3413fe6bfd423d45d083ff4ed62c0f72c2cc272f Mon Sep 17 00:00:00 2001
From: Bharat Mediratta <bharat@menalto.com>
Date: Thu, 28 May 2009 06:11:53 +0800
Subject: Rename 'kohana' to 'system' to conform to the Kohana filesystem
 layout.  I'm comfortable with us not clearly drawing the distinction about
 the fact that it's Kohana.

Signed-off-by: Gallery Role Account <gallery@menalto.com>
---
 system/libraries/ORM_Versioned.php | 143 +++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 system/libraries/ORM_Versioned.php

(limited to 'system/libraries/ORM_Versioned.php')

diff --git a/system/libraries/ORM_Versioned.php b/system/libraries/ORM_Versioned.php
new file mode 100644
index 00000000..078fe16a
--- /dev/null
+++ b/system/libraries/ORM_Versioned.php
@@ -0,0 +1,143 @@
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * 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_Core 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;
+	}
+
+}
\ No newline at end of file
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