Small examples showing how to use MaxHSLikeSolver.

org.sat4j.maxsat/src/test/java/org/sat4j/maxsat/TestMaxHSLikeSolver.java

+package org.sat4j.maxsat;
+
+import static org.junit.Assert.*;
+
+import java.math.BigInteger;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.sat4j.core.VecInt;
+import org.sat4j.specs.ContradictionException;
+import org.sat4j.specs.TimeoutException;
+
+public class TestMaxHSLikeSolver {
+
+    private MaxHSLikeSolver pwms;
+    
+    @Before
+    public void init() {
+        this.pwms = new MaxHSLikeSolver(org.sat4j.pb.SolverFactory.newDefault(), org.sat4j.minisat.SolverFactory.newDefault());
+    }
+    
+    @Test
+    public void testOnePMS() throws ContradictionException, TimeoutException {
+        pwms.newVar(4);
+        pwms.addHardClause(new VecInt(new int[] {1,2,3,4}));
+        pwms.addSoftClause(new VecInt(new int[] {-1,-2}));
+        pwms.addSoftClause(new VecInt(new int[] {-1,2}));
+        pwms.addSoftClause(new VecInt(new int[] {1,-3}));
+        pwms.addSoftClause(new VecInt(new int[] {1,3}));
+        assertTrue(pwms.isSatisfiable());
+        assertEquals(pwms.violatedWeight(),BigInteger.ONE);
+        
+    }
+
+    @Test
+    public void testAnotherPMS() throws ContradictionException, TimeoutException {
+        pwms.newVar(4);
+        pwms.addHardClause(new VecInt(new int[] {1,2,3,4}));
+        pwms.addSoftClause(new VecInt(new int[] {-1,-2}));
+        pwms.addSoftClause(new VecInt(new int[] {1}));
+        pwms.addSoftClause(new VecInt(new int[] {2}));
+        pwms.addSoftClause(new VecInt(new int[] {-1,-3}));
+        pwms.addSoftClause(new VecInt(new int[] {3}));
+        assertTrue(pwms.isSatisfiable());
+        assertEquals(pwms.violatedWeight(),BigInteger.ONE);
+        
+    }
+    
+    @Test
+    public void testAnotherPMSRelaxingTwoConstraints() throws ContradictionException, TimeoutException {
+        pwms.newVar(4);
+        pwms.addHardClause(new VecInt(new int[] {1,2,3,4}));
+        pwms.addSoftClause(new VecInt(new int[] {-1,-2}));
+        pwms.addSoftClause(new VecInt(new int[] {1}));
+        pwms.addSoftClause(new VecInt(new int[] {2}));
+        pwms.addSoftClause(new VecInt(new int[] {-3,-4}));
+        pwms.addSoftClause(new VecInt(new int[] {3}));
+        pwms.addSoftClause(new VecInt(new int[] {4}));
+        assertTrue(pwms.isSatisfiable());
+        assertEquals(pwms.violatedWeight(),BigInteger.valueOf(2));        
+    }
+    
+    @Test
+    public void testOneWPMS() throws ContradictionException, TimeoutException {
+        pwms.newVar(4);
+        pwms.addHardClause(new VecInt(new int[] {1,2,3,4}));
+        pwms.addSoftClause(1000,new VecInt(new int[] {-1,-2}));
+        pwms.addSoftClause(500,new VecInt(new int[] {-1,2}));
+        pwms.addSoftClause(200,new VecInt(new int[] {1,-3}));
+        pwms.addSoftClause(100,new VecInt(new int[] {1,3}));
+        assertTrue(pwms.isSatisfiable());
+        assertEquals(pwms.violatedWeight(),BigInteger.valueOf(100));     
+    }
+    
+}