How to delete a folder and content files in the SFTP Server

I just wrote this java script. it's working fine.

 import org.mule.api.MuleMessage;
 import org.mule.api.transformer.TransformerException;
 import org.mule.transformer.AbstractMessageTransformer;
 import org.mule.transport.sftp.SftpClient;
 
 public class STSFTPController extends AbstractMessageTransformer{
     @Override
     public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException {
         Boolean result=false;
         STSFTPController controller = new STSFTPController();
         
         String sftp_host     = (String)message.getInvocationProperty("sftp_host");
         sftp_host = sftp_host.replaceAll("\\s+","");    
         
         String userName     = (String)message.getInvocationProperty("sftp_username");
         userName = userName.replaceAll("\\s+","");
         
         String password     = (String)message.getInvocationProperty("sftp_password");
         password = password.replaceAll("\\s+","");
         
         SftpClient client = new SftpClient(sftp_host);
         
         try{
             
             client.login(userName,password);
             logger.info("SFTP Client connected correctly.");            
             result = controller.deleteDirectory(message.getInvocationProperty("yesterdayFolderPath"),client);
             logger.info("SFTP Folder Removed: ."+result);
             
         }
         catch(Exception er){
             logger.info("Error occurred: "+er.getMessage());
         }        
         return result;
     }
     
     /**
      * 
      * @param path
      * @param client
      * @return
      */
     public Boolean deleteDirectory(String path,SftpClient client){
         Boolean deleted;
         try{
             client.deleteDirectory(path);
             deleted = true;
         }
         catch(Exception er){
             logger.info("Error occurred: "+er.getMessage());
             deleted = false;
         }
     
         return deleted;
     }
 }

Thanks.