replace Zend_Loader::isReadable() with simple is_readable() since paths are...

replace Zend_Loader::isReadable() with simple is_readable() since paths are absolute; reduce core dependencies on Zend_Loader

git-svn-id: http://dev.piwik.org/svn/trunk@2117 59fd770c-687e-43c8-a1e3-f5a4ff64c105

core/API/Proxy.php

@@ -232,7 +232,7 @@ class Piwik_API_Proxy
 		$module = self::getModuleNameFromClassName($fileName);
 		$path = PIWIK_INCLUDE_PATH . '/plugins/' . $module . '/API.php';
 
-		if(Zend_Loader::isReadable($path))
+		if(is_readable($path))
 		{
 			require_once $path; // prefixed by PIWIK_INCLUDE_PATH
 		}

core/Config.php

@@ -106,7 +106,7 @@ class Piwik_Config
 	public function init()
 	{
 		$this->defaultConfig = new Piwik_Config_Ini($this->pathIniFileDefaultConfig, null, true);
-		if(!Zend_Loader::isReadable($this->pathIniFileUserConfig))
+		if(!is_readable($this->pathIniFileUserConfig))
 		{
 			throw new Exception("The configuration file {$this->pathIniFileUserConfig} has not been found.");
 		}

core/FrontController.php

@@ -108,7 +108,7 @@ class Piwik_FrontController
 		if(!class_exists($controllerClassName, false))
 		{
 			$moduleController = PIWIK_INCLUDE_PATH . '/plugins/' . $module . '/Controller.php';
-			if( !Zend_Loader::isReadable($moduleController))
+			if(!is_readable($moduleController))
 			{
 				throw new Exception("Module controller $moduleController not found!");
 			}

core/Log.php

@@ -61,7 +61,6 @@ abstract class Piwik_Log extends Zend_Log
 	
 	function addWriteToNull()
 	{
-		Zend_Loader::loadClass('Zend_Log_Writer_Null');
 		$this->addWriter( new Zend_Log_Writer_Null );
 	}
 	

core/PluginsManager.php

@@ -398,8 +398,8 @@ class Piwik_PluginsManager
 	 */
 	private function loadTranslation( $plugin, $langCode )
 	{
-		// we are certainly in Tracker mode, Zend is not loaded
-		if(!class_exists('Zend_Loader', false))
+		// we are in Tracker mode if Piwik_Loader is not (yet) loaded
+		if(!class_exists('Piwik_Loader', false))
 		{
 			return ;
 		}