add a service builder

lib/Alchemy/Phrasea/Core/ServiceBuilder.php

@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2010 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\Core;
+
+/**
+ *
+ * @package
+ * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
+ * @link        www.phraseanet.com
+ */
+class ServiceBuilder
+{
+  const LOG = 'log';
+  const TEMPLATE_ENGINE = 'template_engine';
+  const ORM = 'orm';
+
+  protected static $scopes = array(
+      self::ORM, self::TEMPLATE_ENGINE, self::LOG
+  );
+
+  public static function build($serviceName, $serviceScope, $serviceType, Array $options, $namespace = null)
+  {
+    if (!in_array($serviceScope, self::$scopes))
+    {
+      throw new \Exception(sprintf("Unknow service scope of type %s", $serviceScope));
+    }
+
+    $composedScope = explode("_", $serviceScope);
+
+    if (count($composedScope) > 1)
+    {
+      $scope = "";
+      foreach ($composedScope as $word)
+      {
+        $scope .= ucfirst($word);
+      }
+      $serviceScope = $scope;
+    }
+
+    if (is_string($namespace))
+    {
+      $scope = sprintf("%s\%s", ucfirst($namespace), ucfirst($serviceScope));
+    }
+
+    $className = sprintf(
+            "\Alchemy\Phrasea\Core\Service\%s\%s"
+            , ucfirst($serviceScope)
+            , ucfirst($serviceType)
+    );
+
+    if (class_exists($className))
+    {
+      return new $className($serviceName, $options);
+    }
+    else
+    {
+      throw new \Exception(sprintf(
+                      'Unknow service %s for %s scopes looked for classname %s'
+                      , str_replace('/', '_', $serviceType)
+                      , $serviceScope
+                      , $className)
+      );
+    }
+  }
+
+}