6 files changed, 105 insertions, 0 deletions
diff --git a/src/jrummikub/ai/fdsolver/Constraint.java b/src/jrummikub/ai/fdsolver/Constraint.java
new file mode 100644
index 0000000..0d4071d
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/Constraint.java
@@ -0,0 +1,5 @@
+package jrummikub.ai.fdsolver;
+
+public interface Constraint {
+	
+}
diff --git a/src/jrummikub/ai/fdsolver/Constraints.java b/src/jrummikub/ai/fdsolver/Constraints.java
new file mode 100644
index 0000000..589ecb5
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/Constraints.java
@@ -0,0 +1,13 @@
+package jrummikub.ai.fdsolver;
+
+public class Constraints {
+
+	public static <T extends Comparable<T>> void lessThan(Solver solver, Var<T> x, Var<T> y) {
+		// TODO Auto-generated method stub
+	}
+
+	public static <T extends Comparable<T>> void lessThan(Solver solver, Var<T> x, T y) {
+		// TODO Auto-generated method stub
+	}
+
+}
diff --git a/src/jrummikub/ai/fdsolver/LessThan.java b/src/jrummikub/ai/fdsolver/LessThan.java
new file mode 100644
index 0000000..25acd9b
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/LessThan.java
@@ -0,0 +1,9 @@
+package jrummikub.ai.fdsolver;
+
+public class LessThan<T> implements Constraint {
+
+	public LessThan(Var<T> x, Var<T> y) {
+		// TODO Auto-generated constructor stub
+	}
+
+}
diff --git a/src/jrummikub/ai/fdsolver/Solver.java b/src/jrummikub/ai/fdsolver/Solver.java
new file mode 100644
index 0000000..1164c36
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/Solver.java
@@ -0,0 +1,25 @@
+package jrummikub.ai.fdsolver;
+
+public class Solver {
+
+	public void add(Constraint constraint) {
+		// TODO Auto-generated method stub
+		
+	}
+
+	public boolean solve() {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	public void push() {
+		// TODO Auto-generated method stub
+		
+	}
+
+	public void pop() {
+		// TODO Auto-generated method stub
+		
+	}
+
+}
diff --git a/src/jrummikub/ai/fdsolver/Var.java b/src/jrummikub/ai/fdsolver/Var.java
new file mode 100644
index 0000000..a2b5cd7
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/Var.java
@@ -0,0 +1,25 @@
+package jrummikub.ai.fdsolver;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Var<T> {
+	Set<T> range;
+	
+	public Var(Solver solver, Collection<T> range) {
+		this.range = new HashSet<T>(range);
+	}
+
+	public static <T> Var<T> range(Solver solver, T low, T high) {
+		// TODO todo todo todo
+		return null;
+	}
+
+	public T getValue() {
+		if (range.size() != 1)
+			return null;
+		return range.iterator().next();
+	}
+
+}
diff --git a/test/jrummikub/ai/fdsolver/SolverTest.java b/test/jrummikub/ai/fdsolver/SolverTest.java
new file mode 100644
index 0000000..3798423
--- /dev/null
+++ b/test/jrummikub/ai/fdsolver/SolverTest.java
@@ -0,0 +1,28 @@
+package jrummikub.ai.fdsolver;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+
+import org.junit.Test;
+
+public class SolverTest {
+	@Test
+	public void test() {
+		Solver solver = new Solver();
+
+		Var<Integer> x = new Var<Integer>(solver, Arrays.asList(1, 2, 3));
+		Var<Integer> y = Var.range(solver, 1,13);
+		
+		Constraints.lessThan(solver, y, x);
+				
+		while(solver.solve()) {
+			solver.push();
+			Constraints.lessThan(solver, x, x.getValue());
+		}
+		solver.pop();
+		
+		assertEquals(2, (int)x.getValue());
+		assertEquals(1, (int)y.getValue());
+	}
+}