Refresh kohana from upstream svn trunk r3771.

During this process, remove a considerable number of files from kohana
that we will not be needing in Gallery3, including the following files
and directories:
    kohana/application
    kohana/example.htaccess
    kohana/index.php
    kohana/install.php
    kohana/kohana.png
    kohana/modules/archive
    kohana/modules/auth
    kohana/modules/flot
    kohana/modules/gmaps
    kohana/modules/kodoc
    kohana/modules/payment
    kohana/modules/smarty
    kohana/modules/unit_test/i18n
    kohana/modules/unit_test/tests/Example_Test.php
    kohana/modules/unit_test/tests/Valid_Test.php
    kohana/system/config/captcha.php
    kohana/system/controllers/captcha.php
    kohana/system/fonts
    kohana/system/i18n
    kohana/system/libraries/Calendar.php
    kohana/system/libraries/Calendar_Event.php
    kohana/system/libraries/Captcha.php
    kohana/system/libraries/Tagcloud.php
    kohana/system/vendor
    kohana/system/views/pagination
    kohana/system/views/kohana_calendar.php

1 files changed, 76 insertions, 0 deletions

diff --git a/kohana/libraries/ORM_Tree.php b/kohana/libraries/ORM_Tree.php
new file mode 100644
index 00000000..72f55540
--- /dev/null
+++ b/kohana/libraries/ORM_Tree.php
@@ -0,0 +1,76 @@
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * Object Relational Mapping (ORM) "tree" extension. Allows ORM objects to act
+ * as trees, with parents and children.
+ *
+ * $Id$
+ *
+ * @package    ORM
+ * @author     Kohana Team
+ * @copyright  (c) 2007-2008 Kohana Team
+ * @license    http://kohanaphp.com/license.html
+ */
+class ORM_Tree_Core extends ORM {
+
+	// Name of the child
+	protected $children;
+
+	// Parent keyword name
+	protected $parent_key = 'parent_id';
+
+	/**
+	 * Overload ORM::__get to support "parent" and "children" properties.
+	 *
+	 * @param   string  column name
+	 * @return  mixed
+	 */
+	public function __get($column)
+	{
+		if ($column === 'parent')
+		{
+			if (empty($this->related[$column]))
+			{
+				// Load child model
+				$model = ORM::factory(inflector::singular($this->children));
+
+				if (array_key_exists($this->parent_key, $this->object))
+				{
+					// Find children of this parent
+					$model->where($model->primary_key, $this->object[$this->parent_key])->find();
+				}
+
+				$this->related[$column] = $model;
+			}
+
+			return $this->related[$column];
+		}
+		elseif ($column === 'children')
+		{
+			if (empty($this->related[$column]))
+			{
+				$model = ORM::factory(inflector::singular($this->children));
+
+				if ($this->children === $this->table_name)
+				{
+					// Load children within this table
+					$this->related[$column] = $model
+						->where($this->parent_key, $this->object[$this->primary_key])
+						->find_all();
+				}
+				else
+				{
+					// Find first selection of children
+					$this->related[$column] = $model
+						->where($this->foreign_key(), $this->object[$this->primary_key])
+						->where($this->parent_key, NULL)
+						->find_all();
+				}
+			}
+
+			return $this->related[$column];
+		}
+
+		return parent::__get($column);
+	}
+
+} // End ORM Tree
\ No newline at end of file