Added navigation model.

Author: danielwaghorn

README.md

@@ -9,6 +9,8 @@ The folders in this repo are as follows:
 
 `sql` contains an SQL dump which should be run against a database to create the required schema. *This is in MySQL format.*
 
+`config` contains the config files that can be used for library. **Copy into your `application` directory.**
+
 `libraries` contains the PHP files for the library. **Copy into your `application` directory.**
 
 `models` contains required models for the library. **Copy into your `application` directory.**

models/nav_model.php

@@ -0,0 +1,96 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * Model used by navigation library.
+ * This facilitates reading navigation information stored in the
+ * database. It does not perform any edits or additions.
+ * User: danielwaghorn
+ * Date: 11/06/15
+ * Time: 09:05
+ */
+
+class Nav_model extends CI_Model {
+
+    var $title   = '';
+    var $content = '';
+    var $date    = '';
+
+    function __construct()
+    {
+        // Call the Model constructor
+        parent::__construct();
+        $this->load->database();
+    }
+
+    public function getMenuID($menu_name) {
+        /**
+         * Returns the id from associated menu handle
+         * @param $menu_name : string name associated to menu defined in CI-Nav-Menus
+         * @returns int menu ID otherwise -1;
+         */
+
+        $query = $this->db->query('SELECT `MenuName` FROM `CI-Nav-Menus` WHERE `MenuID` = ' . $menu_name);
+        $row = $query->row();
+        return $row->MenuName;
+    }
+
+    public function getTopLevelNav_byName($menu_name) {
+        /**
+         * Returns the top level of a menu
+         * @param $menu_name : String handle of menu e.g. 'public'
+         *  as defined in CI-Nav-Menus
+         * @returns : Query with result, if invalid NULL
+         */
+
+        // Check $nav_name is not null
+        if (isset($menu_name) && (strcmp(preg_replace("/[^a-zA-Z0-9]+/", "", $menu_name),$menu_name))) {
+            // Get ID
+            $menu_ID = $this->getMenuID($menu_name);
+            // Return Menu
+            return $this->getTopLevelNav_byID((int) $menu_ID);
+        }
+
+        return NULL;
+    }
+
+    public function getTopLevelNav_byID($menu_ID) {
+        /**
+         * Returns the top level of a menu
+         * @param $menu_ID : int ID of menu as defined in CI-Nav-Menus
+         * @returns : Query with result
+         */
+
+        if (isset($menu_ID) && $menu_ID != -1 && is_int($menu_ID)) {
+
+            $query = $this->db->query('SELECT `ItemName`, `ItemHumanName`, `ItemLink`
+                                    FROM `CI-Nav-Items` AS I
+                                    INNER JOIN `CI-Nav-InMenu` AS C
+                                    ON C.`ItemID` = I.`ItemID`
+                                    WHERE C.`MenuID` = ' . $menu_ID);
+
+            return $query;
+
+        }
+        return NULL;
+    }
+
+    public function getSubItems($item_ID) {
+        /**
+         * Returns sub items under a menu item where ParentItem
+         * refs ItemID in CI-Nav-Items
+         * @param $item_ID : int ID of menu item as defined in
+         * CI-Nav-Items
+         * @returns : Query with result of MenuItems
+         */
+
+        if (isset($item_ID) && is_int($item_ID)) {
+
+            $query = $this->db->query('SELECT `ItemName`, `ItemHumanName`, `ItemLink`
+                                        FROM `CI-Nav-Items`
+                                        WHERE `ParentItem` = ' . $item_ID);
+            return $query;
+
+        }
+        return NULL;
+    }
+
+}