Config parse and check

1 files changed, 106 insertions, 0 deletions

diff --git a/classes/CinisisDb.php b/classes/CinisisDb.php
new file mode 100644
index 0000000..ae80a00
--- /dev/null
+++ b/classes/CinisisDb.php
@@ -0,0 +1,106 @@
+<?php
+
+/**
+ * CinisisDb main class.
+ */
+class CinisisDb {
+  /**
+   * @var $db
+   *   Database resource.
+   */  
+  var $db;
+
+  /**
+   * @var $implementation
+   *   Database implementation.
+   */
+  var $implementation;
+
+  /**
+   * Constructor.
+   *
+   * @param $config
+   *   Optional parameter to set alternative config file or array
+   *   with configuration.
+   */   
+  function __construct($config = 'config/config.yaml') {
+    try {
+      // Check main configuration.
+      $config = $this->parse($config);
+
+      // Check database schema.
+      $schema = $this->parse('schemas/'. $config['database'] .'.yaml', 'schema');
+    } catch (Exception $e) {
+      echo '[cinisis] caught exception: ',  $e->getMessage(), "\n";
+      return FALSE;
+    }
+
+    // Setup database connection.
+    $this->implementation = $config['implementation'] .'Db';
+    $this->db             = new $this->implementation($schema);
+  }
+
+  /**
+   * Config file load.
+   *
+   * @param $file
+   *   Config file.
+   *
+   * @return
+   *   Array with configuration.
+   */
+  function load($file) {
+    if (!file_exists($file)) {
+      throw new Exception('Config '. $file .' not found.');
+    }
+
+    // Load configuration.
+    return Spyc::YAMLLoad($file);
+  }
+
+  /**
+   * Parse configuration.
+   *
+   * @param $config
+   *   Config file or array with configuration.
+   *
+   * @param $type
+   *   Configuration type (either 'cinisis' or 'schema').
+   *
+   * @return
+   *   Array with configuration or FALSE on error.
+   */
+  function parse($config, $type = 'cinisis') {
+    // Load configuration if needed.
+    if (!is_array($config)) {
+      $config = $this->load($config);
+    }
+
+    // Check configuration.
+    $class = ucfirst($type) .'Db';
+    return call_user_func(array($class, 'check'), $config);
+  }
+
+  /**
+   * Check configuration.
+   *
+   * @param $config
+   *   Config file or array with configuration.
+   *
+   * @return
+   *   Array with configuration or FALSE on error.
+   */  
+  public function check($config) {
+    // Set default database backend if needed.
+    if (!isset($config['implementation'])) {
+      $config['implementation'] = 'PhpIsis';
+    }
+
+    // Check database configuration.
+    if (!isset($config['database'])) {
+      throw new Exception('No database set on configuration.');
+    }
+
+    return $config;
+  }
+}