Java utils

Utils.java

public class Utils{

  public boolean isStrBlank(String str) {
		if (str == null) {
			return true;
		} else if (str.equals("")) {
			return true;
		} else if (str.trim().isEmpty()) {
			return true;
		} else {
			return false;
		}
	}
  
  public static int safeLongToInt(long l) {
		if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
			LOGGER.warn("Cannot be cast to int without changing its value.");
			throw new IllegalArgumentException(l
					+ " Cannot be cast to int without changing its value.");
		}
		
		return (int) l;
	}
  
  public static XMLGregorianCalendar dateToXMLGregorianCalendar(Date date) {
  
    if (date == null) {
    	return null;
    }
  
    Calendar cal = new GregorianCalendar();
    cal.setTime(date);
    
    try {
    	
    	XMLGregorianCalendar tmStamp = DatatypeFactory.newInstance().newXMLGregorianCalendar(
    			DatatypeConverter.printDate(cal));
    	
    	// se establace el tiempo de la fecha ya que no se porque
    	// con las lineas anteriores no se refleja y es necesario.
    	tmStamp.setHour(00);
            tmStamp.setMinute(00); 
            tmStamp.setSecond(00);
            
            return tmStamp;
    	
    } catch (DatatypeConfigurationException e) {
    	LOGGER.warn("Error to convert Date to XMLGregorianCalendar." + e);
    	return null;
    }
  
  }
	
  public static Date xmlGregorianCalendarToDate(XMLGregorianCalendar calendar){
    if(calendar == null) {
        return null;
    }
        
    return calendar.toGregorianCalendar().getTime();
  }
  	
  public static String decodeB64(String pp) {
  	byte[] xmlSignedDecoded = org.apache.commons.codec.binary.Base64.decodeBase64(pp);
  	return byteArrayToString(xmlSignedDecoded, ConstFacturae.ENCODING_UTF8);
  }

  public static String encodeB64(String pp) {
  	byte[] binaryData = pp.getBytes();
  	byte[] encodedBinaryData = org.apache.commons.codec.binary.Base64.encodeBase64(binaryData);
  	return byteArrayToString(encodedBinaryData, ConstFacturae.ENCODING_UTF8);
  }

private static String byteArrayToString(byte[] byteArray, String encoding) {
	if(byteArray == null || (byteArray != null && byteArray.length == 0)){
		return null;
	}
	
	try {
		return new String(byteArray, encoding);
	} catch (UnsupportedEncodingException e) {
		return null;
	}
	
}
  
}