Check if Magento Compiler is Enabled or Compiled

    /**
     * Checks if Magento has compiled files
     * @return boolean true if any compiled files are found
     */
    public function isCompiled()
    {
        if (!Mage::helper('wf_customerbalance/version')->isBaseMageVersionAtLeast('1.4')) {
            return false;
        }

        $compiler = Mage::getModel('compiler/process');
        if(!$compiler) {
            return false;
        }

        if($compiler->getCollectedFilesCount() == 0) {
            return false;
        }

        return true;
    }

    /**
     * Chekcs if the Magento compilation is enabled.
     * @return boolean true if the Mangento compilation mode (compiler) is enabled
     */
    public function isCompilationEnabled()
    {
        if (!defined('COMPILER_INCLUDE_PATH')) {
            return false;
        }
        return true;
    }