1 files changed, 51 insertions, 0 deletions
diff --git a/main/src/cgeo/geocaching/location/DistanceParser.java b/main/src/cgeo/geocaching/location/DistanceParser.java
new file mode 100644
index 0000000..1fb8fc7
--- /dev/null
+++ b/main/src/cgeo/geocaching/location/DistanceParser.java
@@ -0,0 +1,51 @@
+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(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;
+    }
+
+}