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package tim.prune.data;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
/**
* Abstract class to offer general number manipulation functions
*/
public abstract class NumberUtils
{
/** Number formatter object to avoid lots of instantiations */
private static final NumberFormat NUM_FORMATTER = NumberFormat.getNumberInstance(Locale.UK);
// Select the UK locale for this formatter so that decimal point is always used (not comma)
static {
if (NUM_FORMATTER instanceof DecimalFormat) ((DecimalFormat) NUM_FORMATTER).applyPattern("0.000");
}
/**
* Find the number of decimal places represented in the String
* @param inString String to check
* @return number of decimal places, or 0 for integer value
*/
public static int getDecimalPlaces(String inString)
{
if (inString == null || inString.equals("")) {return 0;}
int places = 0;
final int sLen = inString.length();
for (int i=sLen-1; i>=0; i--) {
char c = inString.charAt(i);
if (c >= '0' && c <= '9') {
// Numeric character found
places++;
}
else {
// Non-numeric character found, return places
return places;
}
}
// No non-numeric characters found, so must be integer
return 0;
}
/**
* Format the given number to the given number of decimal places
* @param inNumber double number to format
* @param inDecimalPlaces number of decimal places
*/
public static String formatNumber(double inNumber, int inDecimalPlaces)
{
NUM_FORMATTER.setMaximumFractionDigits(inDecimalPlaces);
NUM_FORMATTER.setMinimumFractionDigits(inDecimalPlaces);
return NUM_FORMATTER.format(inNumber);
}
}
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