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

---
 .../ox/cs/pagoda/constraints/UpperUnaryBottom.java | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/uk/ac/ox/cs/pagoda/constraints/UpperUnaryBottom.java

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

diff --git a/src/uk/ac/ox/cs/pagoda/constraints/UpperUnaryBottom.java b/src/uk/ac/ox/cs/pagoda/constraints/UpperUnaryBottom.java
new file mode 100644
index 0000000..2b57a52
--- /dev/null
+++ b/src/uk/ac/ox/cs/pagoda/constraints/UpperUnaryBottom.java
@@ -0,0 +1,52 @@
+package uk.ac.ox.cs.pagoda.constraints;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.Map;
+
+import org.semanticweb.HermiT.model.Atom;
+import org.semanticweb.HermiT.model.AtomicConcept;
+import org.semanticweb.HermiT.model.DLClause;
+import org.semanticweb.HermiT.model.Term;
+import org.semanticweb.HermiT.model.Variable;
+
+public class UpperUnaryBottom extends UnaryBottom {
+	
+	static final Variable X = Variable.create("X"); 
+	
+	Map<DLClause, Integer> number = new HashMap<DLClause, Integer>(); 
+	
+	@Override
+	public Collection<DLClause> process(Collection<DLClause> clauses) {
+		Collection<DLClause> ret = new LinkedList<DLClause>(); 
+		for (DLClause clause: clauses) 
+			if (clause.getHeadLength() == 0) {
+				ret.add(DLClause.create(getEmptyHead(pickRepresentative(clause.getBodyAtoms()), clause), clause.getBodyAtoms())); 
+				ret.add(DLClause.create(getEmptyHead(X), getEmptyHead(X, clause))); 
+			}
+			else 
+				ret.add(clause); 
+		return ret;
+	}
+
+	@Override
+	public boolean isBottomRule(DLClause clause) {
+		return clause.getHeadLength() == 1 && clause.getHeadAtom(0).getDLPredicate().toString().contains(AtomicConcept.NOTHING.toString());
+	}
+
+	public Atom[] getEmptyHead(Term t, DLClause clause) {
+		Integer index = number.get(clause); 
+		if (index == null) {
+			number.put(clause, index = number.size() + 1); 
+		}
+		
+		return new Atom[] {Atom.create(AtomicConcept.create(AtomicConcept.NOTHING.getIRI() + index), t)};
+	}
+	
+	@Override
+	public int getBottomNumber() {
+		return number.size() + 1; 
+	}
+
+}
-- 
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