Add FrequencyRange comparator to ServiceState

The FrequencyRange is not comparable beucase it's an enum. This change
add a comparator to ServiceState to make the enum comparable.

Bug: 111453000
Test: atest FrameworksTelephonyTests
Merged-In: I59a595bdaf5451d2c4d95b1b5bdfefcba123fea7
Change-Id: I59a595bdaf5451d2c4d95b1b5bdfefcba123fea7

telephony/java/android/telephony/ServiceState.java

@@ -118,6 +118,13 @@ public class ServiceState implements Parcelable {
      */
     public static final int FREQUENCY_RANGE_MMWAVE = 4;
 
+    private static final List<Integer> FREQUENCY_RANGE_ORDER = Arrays.asList(
+            FREQUENCY_RANGE_UNKNOWN,
+            FREQUENCY_RANGE_LOW,
+            FREQUENCY_RANGE_MID,
+            FREQUENCY_RANGE_HIGH,
+            FREQUENCY_RANGE_MMWAVE);
+
     /** @hide */
     @Retention(RetentionPolicy.SOURCE)
     @IntDef(prefix = "DUPLEX_MODE_",
@@ -1835,4 +1842,13 @@ public class ServiceState implements Parcelable {
             mNetworkRegistrationStates.add(regState);
         }
     }
+
+    /**
+     * @hide
+     */
+    public static final int getBetterNRFrequencyRange(int range1, int range2) {
+        return FREQUENCY_RANGE_ORDER.indexOf(range1) > FREQUENCY_RANGE_ORDER.indexOf(range2)
+                ? range1
+                : range2;
+    }
 }