From 9b6663f87a7e679ffba691cf516191fc840cf978 Mon Sep 17 00:00:00 2001
From: Bharat Mediratta <bharat@menalto.com>
Date: Tue, 24 Nov 2009 19:20:36 -0800
Subject: Update to Kohana r4684 which is now Kohana 2.4 and has substantial
 changes.

---
 system/libraries/drivers/Config.php | 257 ++++++++++++++++++++++++++++++++++++
 1 file changed, 257 insertions(+)
 create mode 100644 system/libraries/drivers/Config.php

(limited to 'system/libraries/drivers/Config.php')

diff --git a/system/libraries/drivers/Config.php b/system/libraries/drivers/Config.php
new file mode 100644
index 00000000..a82684bc
--- /dev/null
+++ b/system/libraries/drivers/Config.php
@@ -0,0 +1,257 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ * Kohana_Config abstract driver to get and set
+ * configuration options.
+ *
+ * Specific drivers should implement caching and encryption
+ * as they deem appropriate.
+ *
+ * $Id: Config.php 4679 2009-11-10 01:45:52Z isaiah $
+ *
+ * @package    Kohana_Config
+ * @author     Kohana Team
+ * @copyright  (c) 2007-2009 Kohana Team
+ * @license    http://kohanaphp.com/license
+ * @abstract
+ */
+abstract class Config_Driver {
+
+	/**
+	 * Internal caching
+	 *
+	 * @var     Cache
+	 */
+	protected $cache;
+
+	/**
+	 * The name of the internal cache
+	 *
+	 * @var     string
+	 */
+	protected $cache_name = 'Kohana_Config_Cache';
+
+	/**
+	 * Cache Lifetime
+	 *
+	 * @var mixed
+	 */
+	protected $cache_lifetime = FALSE;
+
+	/**
+	 * The Encryption library
+	 *
+	 * @var     Encrypt
+	 */
+	protected $encrypt;
+
+	/**
+	 * The config loaded
+	 *
+	 * @var     array
+	 */
+	protected $config = array();
+
+	/**
+	 * The changed status of configuration values,
+	 * current state versus the stored state.
+	 *
+	 * @var     bool
+	 */
+	protected $changed = FALSE;
+
+	/**
+	 * Determines if any config has been loaded yet
+	 */
+	public $loaded = FALSE;
+
+	/**
+	 * Array driver constructor. Sets up the PHP array
+	 * driver, including caching and encryption if
+	 * required
+	 *
+	 * @access  public
+	 */
+	public function __construct($config)
+	{
+
+		if (($cache_setting = $config['internal_cache']) !== FALSE)
+		{
+			$this->cache_lifetime = $cache_setting;
+			// Restore the cached configuration
+			$this->config = $this->load_cache();
+
+			if (count($this->config) > 0)
+				$this->loaded = TRUE;
+
+			// Add the save cache method to system.shutshut event
+			Event::add('system.shutdown', array($this, 'save_cache'));
+		}
+
+	}
+
+	/**
+	 * Gets a value from config. If required is TRUE
+	 * then get will throw an exception if value cannot
+	 * be loaded.
+	 *
+	 * @param   string       key  the setting to get
+	 * @param   bool         slash  remove trailing slashes
+	 * @param   bool         required  is setting required?
+	 * @return  mixed
+	 * @access  public
+	 */
+	public function get($key, $slash = FALSE, $required = FALSE)
+	{
+		// Get the group name from the key
+		$group = explode('.', $key, 2);
+		$group = $group[0];
+
+		// Check for existing value and load it dynamically if required
+		if ( ! isset($this->config[$group]))
+			$this->config[$group] = $this->load($group, $required);
+
+		// Get the value of the key string
+		$value = Kohana::key_string($this->config, $key);
+
+		if ($slash === TRUE AND is_string($value) AND $value !== '')
+		{
+			// Force the value to end with "/"
+			$value = rtrim($value, '/').'/';
+		}
+
+		if (($required === TRUE) AND ($value === null))
+			throw new Kohana_Config_Exception('Value not found in config driver');
+
+		$this->loaded = TRUE;
+		return $value;
+	}
+
+	/**
+	 * Sets a new value to the configuration
+	 *
+	 * @param   string       key
+	 * @param   mixed        value
+	 * @return  bool
+	 * @access  public
+	 */
+	public function set($key, $value)
+	{
+		// Do this to make sure that the config array is already loaded
+		$this->get($key);
+
+		if (substr($key, 0, 7) === 'routes.')
+		{
+			// Routes cannot contain sub keys due to possible dots in regex
+			$keys = explode('.', $key, 2);
+		}
+		else
+		{
+			// Convert dot-noted key string to an array
+			$keys = explode('.', $key);
+		}
+
+		// Used for recursion
+		$conf =& $this->config;
+		$last = count($keys) - 1;
+
+		foreach ($keys as $i => $k)
+		{
+			if ($i === $last)
+			{
+				$conf[$k] = $value;
+			}
+			else
+			{
+				$conf =& $conf[$k];
+			}
+		}
+
+		if (substr($key,0,12) === 'core.modules')
+		{
+			// Reprocess the include paths
+			Kohana::include_paths(TRUE);
+		}
+
+		// Set config to changed
+		return $this->changed = TRUE;
+	}
+
+	/**
+	 * Clear the configuration
+	 *
+	 * @param   string       group
+	 * @return  bool
+	 * @access  public
+	 */
+	public function clear($group)
+	{
+		// Remove the group from config
+		unset($this->config[$group]);
+
+		// Set config to changed
+		return $this->changed = TRUE;
+	}
+
+	/**
+	 * Checks whether the setting exists in
+	 * config
+	 *
+	 * @param   string $key
+	 * @return  bool
+	 * @access  public
+	 */
+	public function setting_exists($key)
+	{
+		return $this->get($key) === NULL;
+	}
+
+	/**
+	 * Loads a configuration group based on the setting
+	 *
+	 * @param   string       group
+	 * @param   bool         required
+	 * @return  array
+	 * @access  public
+	 * @abstract
+	 */
+	abstract public function load($group, $required = FALSE);
+
+	/**
+	 * Loads the cached version of this configuration driver
+	 *
+	 * @return  array
+	 * @access  public
+	 */
+	public function load_cache()
+	{
+		// Load the cache for this configuration
+		$cached_config = Kohana::cache($this->cache_name, $this->cache_lifetime);
+
+		// If the configuration wasn't loaded from the cache
+		if ($cached_config === NULL)
+			$cached_config = array();
+
+		// Return the cached config
+		return $cached_config;
+	}
+
+	/**
+	 * Saves a cached version of this configuration driver
+	 *
+	 * @return  bool
+	 * @access  public
+	 */
+	public function save_cache()
+	{
+		// If this configuration has changed
+		if ($this->get('core.internal_cache') !== FALSE AND $this->changed)
+		{
+			$data = $this->config;
+
+			// Save the cache
+			return Kohana::cache_save($this->cache_name, $data, $this->cache_lifetime);
+		}
+
+		return TRUE;
+	}
+} // End Kohana_Config_Driver
\ No newline at end of file
-- 
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