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package cgeo.geocaching.location;
import cgeo.geocaching.utils.MatcherWrapper;
import org.apache.commons.lang3.StringUtils;
import java.util.Locale;
import java.util.regex.Pattern;
public final class DistanceParser {
private static final Pattern pattern = Pattern.compile("^([0-9.,]+)[ ]*(m|km|ft|yd|mi|)?$", Pattern.CASE_INSENSITIVE);
/**
* Parse a distance string composed by a number and an optional suffix
* (such as "1.2km").
*
* @param distanceText
* the string to analyze
* @return the distance in kilometers
*
* @throws NumberFormatException
* if the given number is invalid
*/
public static float parseDistance(final String distanceText, final boolean metricUnit)
throws NumberFormatException {
final MatcherWrapper matcher = new MatcherWrapper(pattern, distanceText);
if (!matcher.find()) {
throw new NumberFormatException(distanceText);
}
final float value = Float.parseFloat(matcher.group(1).replace(',', '.'));
final String unit = matcher.group(2).toLowerCase(Locale.US);
if (unit.equals("m") || (StringUtils.isEmpty(unit) && metricUnit)) {
return value / 1000;
}
if (unit.equals("km")) {
return value;
}
if (unit.equals("yd")) {
return value * IConversion.YARDS_TO_KILOMETER;
}
if (unit.equals("mi")) {
return value * IConversion.MILES_TO_KILOMETER;
}
return value * IConversion.FEET_TO_KILOMETER;
}
}
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