1 files changed, 88 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/UnitsConverter.java b/src/main/java/org/traccar/helper/UnitsConverter.java
new file mode 100644
index 000000000..3dd435df4
--- /dev/null
+++ b/src/main/java/org/traccar/helper/UnitsConverter.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.helper;
+
+public final class UnitsConverter {
+
+    private static final double KNOTS_TO_KPH_RATIO = 0.539957;
+    private static final double KNOTS_TO_MPH_RATIO = 0.868976;
+    private static final double KNOTS_TO_MPS_RATIO = 1.94384;
+    private static final double KNOTS_TO_CPS_RATIO = 0.0194384449;
+    private static final double METERS_TO_FEET_RATIO = 0.3048;
+    private static final double METERS_TO_MILE_RATIO = 1609.34;
+    private static final long MILLISECONDS_TO_HOURS_RATIO = 3600000;
+    private static final long MILLISECONDS_TO_MINUTES_RATIO = 60000;
+
+    private UnitsConverter() {
+    }
+
+    public static double knotsFromKph(double value) { // km/h
+        return value * KNOTS_TO_KPH_RATIO;
+    }
+
+    public static double kphFromKnots(double value) {
+        return value / KNOTS_TO_KPH_RATIO;
+    }
+
+    public static double knotsFromMph(double value) {
+        return value * KNOTS_TO_MPH_RATIO;
+    }
+
+    public static double mphFromKnots(double value) {
+        return value / KNOTS_TO_MPH_RATIO;
+    }
+
+    public static double knotsFromMps(double value) { // m/s
+        return value * KNOTS_TO_MPS_RATIO;
+    }
+
+    public static double mpsFromKnots(double value) {
+        return value / KNOTS_TO_MPS_RATIO;
+    }
+
+    public static double knotsFromCps(double value) { // cm/s
+        return value * KNOTS_TO_CPS_RATIO;
+    }
+
+    public static double feetFromMeters(double value) {
+        return value / METERS_TO_FEET_RATIO;
+    }
+
+    public static double metersFromFeet(double value) {
+        return value * METERS_TO_FEET_RATIO;
+    }
+
+    public static double milesFromMeters(double value) {
+        return value / METERS_TO_MILE_RATIO;
+    }
+
+    public static double metersFromMiles(double value) {
+        return value * METERS_TO_MILE_RATIO;
+    }
+
+    public static long msFromHours(long value) {
+        return value * MILLISECONDS_TO_HOURS_RATIO;
+    }
+
+    public static long msFromHours(double value) {
+        return (long) (value * MILLISECONDS_TO_HOURS_RATIO);
+    }
+
+    public static long msFromMinutes(long value) {
+        return value * MILLISECONDS_TO_MINUTES_RATIO;
+    }
+
+}