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package tim.prune.data;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.HashMap;
import java.util.Locale;
/**
* Caching accessor for the number formatters
*/
public class CoordFormatters
{
private final HashMap<Integer, NumberFormat> _localFormatters = new HashMap<>();
private final HashMap<Integer, NumberFormat> _ukFormatters = new HashMap<>();
/**
* Get a local formatter for the given number of decimal digits, creating and caching it if necessary
* @param inDigits number of digits after the decimal point
* @return number formatter
*/
public NumberFormat getLocalFormatter(int inDigits) {
return getFormatter(_localFormatters, inDigits, null);
}
/**
* Get a UK formatter (using decimal dot) for the given number of decimal digits, creating and caching it if necessary
* @param inDigits number of digits after the decimal point
* @return number formatter
*/
public NumberFormat getUkFormatter(int inDigits) {
// Select the UK locale for this formatter so that decimal point is always used (not comma)
return getFormatter(_ukFormatters, inDigits, Locale.UK);
}
/**
* Get a formatter for the given number of decimal digits, creating and caching it if necessary
* @param inMap map of NumberFormat objects
* @param inDigits number of digits after the decimal point
* @param inLocale locale to use, or null for default
* @return number formatter
*/
private static NumberFormat getFormatter(HashMap<Integer, NumberFormat> inMap,
int inDigits, Locale inLocale)
{
NumberFormat formatter = inMap.get(inDigits);
if (formatter == null)
{
// Formatter doesn't exist yet, so create a new one
formatter = (inLocale == null ? NumberFormat.getNumberInstance() : NumberFormat.getNumberInstance(inLocale));
StringBuilder patternBuilder = new StringBuilder("0.");
if (inDigits > 0) {
patternBuilder.append("0".repeat(inDigits));
}
final String digitPattern = patternBuilder.toString();
if (formatter instanceof DecimalFormat) ((DecimalFormat) formatter).applyPattern(digitPattern);
// Store in map
inMap.put(inDigits, formatter);
}
return formatter;
}
}
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