From 9ce65c5a963b03ee97fe9cb6c5aa65a3c04a80a8 Mon Sep 17 00:00:00 2001
From: yzhou <yujiao.zhou@gmail.com>
Date: Tue, 21 Apr 2015 10:34:27 +0100
Subject: initial version

---
 .../ac/ox/cs/pagoda/constraints/NullaryBottom.java | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 src/uk/ac/ox/cs/pagoda/constraints/NullaryBottom.java

(limited to 'src/uk/ac/ox/cs/pagoda/constraints/NullaryBottom.java')

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;
+	}
+
+}
-- 
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