From 89f315cc534a76f3c4a3e50145d8dbf5e322bff4 Mon Sep 17 00:00:00 2001
From: Denis Molony <dmolony@iinet.net.au>
Date: Mon, 18 Jul 2016 08:42:44 +1000
Subject: [PATCH] helper function

---
 src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java | 6 ++++++
 src/com/bytezone/diskbrowser/disk/DiskAddress.java      | 2 ++
 src/com/bytezone/diskbrowser/dos/DosTSListSector.java   | 2 +-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java b/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java
index d256e96..3e0b0ae 100755
--- a/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java
+++ b/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java
@@ -36,6 +36,12 @@ public class AppleDiskAddress implements DiskAddress
     return this.block - that.getBlock ();
   }
 
+  @Override
+  public boolean matches (DiskAddress that)
+  {
+    return this.block == that.getBlock ();
+  }
+
   @Override
   public int getBlock ()
   {
diff --git a/src/com/bytezone/diskbrowser/disk/DiskAddress.java b/src/com/bytezone/diskbrowser/disk/DiskAddress.java
index 5a34926..0b91398 100755
--- a/src/com/bytezone/diskbrowser/disk/DiskAddress.java
+++ b/src/com/bytezone/diskbrowser/disk/DiskAddress.java
@@ -9,4 +9,6 @@ public interface DiskAddress extends Comparable<DiskAddress>
   public int getSector ();
 
   public Disk getDisk ();
+
+  public boolean matches (DiskAddress other);
 }
\ No newline at end of file
diff --git a/src/com/bytezone/diskbrowser/dos/DosTSListSector.java b/src/com/bytezone/diskbrowser/dos/DosTSListSector.java
index df3e141..f8ca0a1 100755
--- a/src/com/bytezone/diskbrowser/dos/DosTSListSector.java
+++ b/src/com/bytezone/diskbrowser/dos/DosTSListSector.java
@@ -53,7 +53,7 @@ class DosTSListSector extends AbstractSector
   public String createText ()
   {
     DiskAddress da = disk.getDiskAddress (buffer[1], buffer[2]);
-    String msg = da.compareTo (diskAddress) == 0 ? " (circular reference)" : "";
+    String msg = da.matches (diskAddress) ? " (circular reference)" : "";
 
     StringBuilder text = getHeader ("TS List Sector : " + name);
     addText (text, buffer, 0, 1, "Not used");