1 files changed, 31 insertions, 0 deletions

diff --git a/src/uk/ac/ox/cs/pagoda/constraints/NullaryBottom.java b/src/uk/ac/ox/cs/pagoda/constraints/NullaryBottom.java
new file mode 100644
index 0000000..16a9d45
--- /dev/null
+++ b/src/uk/ac/ox/cs/pagoda/constraints/NullaryBottom.java
@@ -0,0 +1,31 @@
+package uk.ac.ox.cs.pagoda.constraints;
+
+import java.util.Collection;
+
+import org.semanticweb.HermiT.model.Atom;
+import org.semanticweb.HermiT.model.DLClause;
+import org.semanticweb.HermiT.model.Term;
+
+public class NullaryBottom implements BottomStrategy {
+        
+        @Override
+        public Collection<DLClause> process(Collection<DLClause> clauses) {
+                return clauses;
+        }
+
+        @Override
+        public boolean isBottomRule(DLClause clause) {
+                return clause.getHeadLength() == 0;
+        }
+
+        @Override
+        public Atom[] getEmptyHead(Term t) {
+                return new Atom[0];
+        }
+
+        @Override
+        public int getBottomNumber() {
+                return 1;
+        }
+
+}