1 files changed, 18 insertions, 19 deletions

diff --git a/src/uk/ac/ox/cs/pagoda/query/AnswerTuples.java b/src/uk/ac/ox/cs/pagoda/query/AnswerTuples.java
index e1e5302..81efed0 100644
--- a/src/uk/ac/ox/cs/pagoda/query/AnswerTuples.java
+++ b/src/uk/ac/ox/cs/pagoda/query/AnswerTuples.java
@@ -1,23 +1,22 @@
 package uk.ac.ox.cs.pagoda.query;
 
-public interface AnswerTuples {
-        
-        public void reset(); 
-        
-        public boolean isValid();
-        
-        public int getArity();  
-        
-        public String[] getAnswerVariables(); 
-        
-        public void moveNext(); 
-        
-        public void dispose(); 
-        
-        public AnswerTuple getTuple(); 
-        
-        public boolean contains(AnswerTuple t);
-        
-        public void remove(); 
+import uk.ac.ox.cs.pagoda.util.disposable.Disposable;
 
+public abstract class AnswerTuples extends Disposable {
+
+    public abstract void reset();
+
+    public abstract boolean isValid();
+
+    public abstract int getArity();
+
+    public abstract String[] getAnswerVariables();
+
+    public abstract void moveNext();
+
+    public abstract AnswerTuple getTuple();
+
+    public abstract boolean contains(AnswerTuple t);
+
+    public abstract void remove();
 }