Implemented new Configuration handling

library/Msd/Config/IoHandler/Default.php

@@ -0,0 +1,128 @@
+<?php
+/**
+ * This file is part of MySQLDumper released under the GNU/GPL 2 license
+ * http://www.mysqldumper.net
+ *
+ * @package         MySQLDumper
+ * @subpackage      Config_IoHandler
+ * @version         SVN: $Rev$
+ * @author          $Author$
+ */
+/**
+ * Class to handle input/output for configuration params.
+ *
+ * @package         MySQLDumper
+ * @subpackage      Config_IoHandler
+ */
+class Msd_Config_IoHandler_Default implements Msd_Config_IoHandler_Interface
+{
+    /**
+     * Array with directories, where config files are located.
+     *
+     * @var array
+     */
+    private $_configDirectories = array();
+
+    /**
+     * Handler for .ini files.
+     *
+     * @var Msd_Ini
+     */
+    private $_iniConfig = null;
+
+    /**
+     * Name of the .ini file, where the config is stored.
+     *
+     * @var string
+     */
+    private $_configFilename = null;
+
+    /**
+     * Configuration namespace in session.
+     *
+     * @var Zend_Session_Namespace
+     */
+    private $_sessionNamespace = null;
+
+    /**
+     * Class constructor
+     *
+     * @param array $handlerOptions
+     *
+     * @return Msd_Config_IoHandler_Default
+     */
+    public function __construct($handlerOptions = array())
+    {
+        if (isset($handlerOptions['directories'])) {
+            $this->_configDirectories = (array) $handlerOptions['directories'];
+        }
+
+        // Create new namespace for session access.
+        $this->_sessionNamespace = new Zend_Session_Namespace('Config');
+    }
+
+    /**
+     * Loads and returns a configuration from session or .ini file.
+     * If the config is read from .ini file, it is also stored to session.
+     *
+     * @param string $configFilename Name of the .ini file, where the config is stored.
+     *
+     * @return array
+     */
+    public function load($configFilename)
+    {
+        // Retrieve config from session
+        $config = (array) $this->_sessionNamespace->config;
+        $this->_configFilename = $configFilename;
+
+        // Check whether the configuration has been loaded.
+        if (count($config) == 0) {
+
+            // Search for the config file in the given directories.
+            $this->_initIni();
+            $config = $this->_iniConfig->getIniData();
+
+            // Put configuration into session.
+            $this->_sessionNamespace->config = $config;
+        }
+
+        return $config;
+    }
+
+    /**
+     * Saves the configuration to session and .ini file.
+     *
+     * @param array  $config Configuration to save.
+     *
+     * @return bool
+     */
+    public function save($config)
+    {
+        if ($this->_iniConfig === null) {
+            $this->_initIni();
+        }
+        // Save config to session
+        $this->_sessionNamespace->config = $config;
+
+        // Save config to .ini file
+        $this->_iniConfig->setIniData($config);
+        return $this->_iniConfig->saveFile($this->_configFilename);
+    }
+
+    /**
+     * Initializes the .ini file handler and sets the full filename of the .ini file.
+     *
+     * @return void
+     */
+    private function _initIni()
+    {
+        foreach ($this->_configDirectories as $configDir) {
+            $filename = rtrim($configDir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . $this->_configFilename;
+            if (file_exists($filename)) {
+                $this->_configFilename = $filename;
+                $this->_iniConfig = new Msd_Ini($filename);
+                break;
+            }
+        }
+    }
+}