1 files changed, 47 insertions, 0 deletions
diff --git a/src/cgeo/geocaching/geopoint/DistanceParser.java b/src/cgeo/geocaching/geopoint/DistanceParser.java
new file mode 100644
index 0000000..3578902
--- /dev/null
+++ b/src/cgeo/geocaching/geopoint/DistanceParser.java
@@ -0,0 +1,47 @@
+package cgeo.geocaching.geopoint;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import cgeo.geocaching.cgBase;
+import cgeo.geocaching.cgSettings;
+
+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 double parseDistance(String distanceText, final int defaultUnit) {
+        final Matcher matcher = pattern.matcher(distanceText);
+
+        if (!matcher.find()) {
+            throw new NumberFormatException(distanceText);
+        }
+
+        final double value = Double.parseDouble(matcher.group(1));
+        final String unit = matcher.group(2).toLowerCase();
+
+        if (unit.equals("m") || (unit.length() == 0 && defaultUnit == cgSettings.unitsMetric)) {
+            return value / 1000;
+        }
+        if (unit.equals("km")) {
+            return value;
+        }
+        if (unit.equals("yd")) {
+            return value * cgBase.yards2km;
+        }
+        if (unit.equals("mi")) {
+            return value * cgBase.miles2km;
+        }
+        return value * cgBase.feet2km;
+    }
+
+}