1 files changed, 57 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/UserUtil.java b/src/main/java/org/traccar/helper/UserUtil.java
new file mode 100644
index 000000000..6050ad349
--- /dev/null
+++ b/src/main/java/org/traccar/helper/UserUtil.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2022 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;
+
+import org.traccar.model.Server;
+import org.traccar.model.User;
+
+import java.util.TimeZone;
+
+public final class UserUtil {
+
+    private UserUtil() {
+    }
+
+    public static String getDistanceUnit(Server server, User user) {
+        return lookupStringAttribute(server, user, "distanceUnit", "km");
+    }
+
+    public static String getSpeedUnit(Server server, User user) {
+        return lookupStringAttribute(server, user, "speedUnit", "kn");
+    }
+
+    public static String getVolumeUnit(Server server, User user) {
+        return lookupStringAttribute(server, user, "volumeUnit", "ltr");
+    }
+
+    public static TimeZone getTimezone(Server server, User user) {
+        String timezone = lookupStringAttribute(server, user, "timezone", null);
+        return timezone != null ? TimeZone.getTimeZone(timezone) : TimeZone.getDefault();
+    }
+
+    private static String lookupStringAttribute(Server server, User user, String key, String defaultValue) {
+        String preference;
+        String serverPreference = server.getString(key);
+        String userPreference = user.getString(key);
+        if (server.getForceSettings()) {
+            preference = serverPreference != null ? serverPreference : userPreference;
+        } else {
+            preference = userPreference != null ? userPreference : serverPreference;
+        }
+        return preference != null ? preference : defaultValue;
+    }
+
+}