protected function _validateSvnConfig()
    {
        if(!$this->svnEnabled)
            throw new SubversionToolsException("Subversion support must be enabled for this action!");

        if(empty($this->svnUsername))
            throw new SubversionToolsException("Property svn.username is required");

        if(empty($this->svnPassword))
            throw new SubversionToolsException("Property svn.password is required");

        if(empty($this->svnRepository))
            throw new SubversionToolsException("Property svn.repository is required");

        return true;
    }