NumberUtils

This helper/util class holds a number of small functions to handle common checks and transformations of numeric values.

Project

com.corzia.comflow.utils

List of methods:

isStringInteger

Used when you want to see if a string is an integer or not, so that you can safely perform a transformation. The argument is parsed to an Integer and the success/failure is handled with a catch statement.

Example of usage

public static void callExample() {
   if (NumbeUtils.isStringInteger("123") {
      Integer myNumber = Integer.valueOf("123");
   }
}

Code

public static boolean isStringInteger(String numericString) {
	try {
		Integer dummy = Integer.valueOf(numericString);
	} catch (NumberFormatException e) {
		return false;
	}
	return true;
}

isStringNumeric

The argument is parsed to an Double and the success/failure is handled with a catch statement.

Example of usage

public static void callExample() {
   if (NumberUtils.isStringNumeric("123.45")) {
      BigDecimal myNumber = new BigDecimal("123.45");
   }
}

Code

public static boolean isStringNumeric(String numericString) {
	try {
		Double.parseDouble(numericString);
		return true;
	} catch (NumberFormatException e) {
		return false;
	}
}

clearTrailingZerosFromNumericText

The method will remove any trailing zeros in a numeric text. If the text ends with a decimal separator it will be removed.

Examples: 

• 123.1000 => 123.1
• 123,1000 => 123,1
• 1,200,300.000 => 1,200,300

Example of usage

String myCleanedNumericText = NumberUtils.clearTrailingZerosFromNumericText("123,400.50000");

Code

public static String clearTrailingZerosFromNumericText(String numericString) {
	if (StringUtil.isBlankOrNullOr0(numericString)) return numericString;
		
	String cleanedNumericText = numericString.trim();
	if (!StringUtil.isBlankOrNull(cleanedNumericText) && cleanedNumericText.length() > 1 && cleanedNumericText.matches("^(\\d*[.,]\\d*)+$")) {
		while (cleanedNumericText.substring(cleanedNumericText.length()-1, cleanedNumericText.length()).equals("0")) {
			cleanedNumericText = cleanedNumericText.substring(0, cleanedNumericText.length()-1);
		}
	}
	if (cleanedNumericText.substring(cleanedNumericText.length()-1).matches("[.,]")) {
		cleanedNumericText = cleanedNumericText.substring(0, cleanedNumericText.length()-1);
	}
	return cleanedNumericText;
}