remove getHostName() (#106)

Co-authored-by: Tilmann Zäschke <tilmann.zaeschke@inf.ethz.ch>

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixed
 - Remove use of 0.0.0.0 and "::". [#103](https://github.com/scionproto-contrib/jpan/pull/103)
+- Remove use of getHostName() in ScionAddress. [#106](https://github.com/scionproto-contrib/jpan/pull/106)
 
 ### Removed
 - Removed some useless IP printing functions. 

src/main/java/org/scion/jpan/ScionAddress.java

@@ -27,23 +27,21 @@
 @Deprecated // This will be made package private in 0.3.0
 public class ScionAddress {
   private final long isdAs;
-  private final String hostName;
   private final InetAddress ipAddress;
 
-  private ScionAddress(long isdAs, String hostName, InetAddress ip) {
-    this.hostName = hostName;
+  private ScionAddress(long isdAs, InetAddress ip) {
     this.ipAddress = ip;
     this.isdAs = isdAs;
   }
 
   static ScionAddress create(long isdAs, InetAddress address) {
-    return new ScionAddress(isdAs, address.getHostName(), address);
+    return new ScionAddress(isdAs, address);
   }
 
   static ScionAddress create(long isdAs, String hostName, byte[] ipBytes) {
     try {
       InetAddress ip = InetAddress.getByAddress(hostName, ipBytes);
-      return new ScionAddress(isdAs, hostName, ip);
+      return new ScionAddress(isdAs, ip);
     } catch (UnknownHostException e) {
       // This should never happen because we always call getByName() with an IP address
       throw new ScionRuntimeException(e);
@@ -55,7 +53,7 @@ public long getIsdAs() {
   }
 
   public String getHostName() {
-    return hostName;
+    return ipAddress.getHostName();
   }
 
   public InetAddress getInetAddress() {