Add a new IpPrefix class and use it in RouteInfo.

This change uses IpPrefix only in the public API and continues
to use LinkAddress for everything else. It does not change the
callers to use the new APIs, with the exception of changing
all current uses of getDestination to getDestinationLinkAddress
to make room for the new getDestination method that returns an
IpPrefix.

Based on Sreeram's earlier change:
https://googleplex-android-review.git.corp.google.com/#/c/477874/
but a bit simplified and with a bit more documentation.

Bug: 15142362
Bug: 13885501
Change-Id: Ib4cd96b22cbff4ea31bb26a7853989f50da8de4e
(cherry picked from commit 7d3b4b9a3d4de9673119632da0ebd583e50126f7)

1 files changed, 3 insertions, 3 deletions

diff --git a/core/tests/coretests/src/android/net/RouteInfoTest.java b/core/tests/coretests/src/android/net/RouteInfoTest.java
index 55d6592..01283a6 100644
--- a/core/tests/coretests/src/android/net/RouteInfoTest.java
+++ b/core/tests/coretests/src/android/net/RouteInfoTest.java
@@ -43,17 +43,17 @@ public class RouteInfoTest extends TestCase {
 
         // Invalid input.
         try {
-            r = new RouteInfo(null, null, "rmnet0");
+            r = new RouteInfo((LinkAddress) null, null, "rmnet0");
             fail("Expected RuntimeException:  destination and gateway null");
         } catch(RuntimeException e) {}
 
         // Null destination is default route.
-        r = new RouteInfo(null, Address("2001:db8::1"), null);
+        r = new RouteInfo((LinkAddress) null, Address("2001:db8::1"), null);
         assertEquals(Prefix("::/0"), r.getDestination());
         assertEquals(Address("2001:db8::1"), r.getGateway());
         assertNull(r.getInterface());
 
-        r = new RouteInfo(null, Address("192.0.2.1"), "wlan0");
+        r = new RouteInfo((LinkAddress) null, Address("192.0.2.1"), "wlan0");
         assertEquals(Prefix("0.0.0.0/0"), r.getDestination());
         assertEquals(Address("192.0.2.1"), r.getGateway());
         assertEquals("wlan0", r.getInterface());