Restructured fdsolver api and made first test succeed

git-svn-id: svn://sunsvr01.isp.uni-luebeck.de/swproj13/trunk@423 72836036-5685-4462-b002-a69064685172

9 files changed, 278 insertions, 0 deletions

diff --git a/src/jrummikub/ai/fdsolver/constraint/ComparatorConstraint.java b/src/jrummikub/ai/fdsolver/constraint/ComparatorConstraint.java
new file mode 100644
index 0000000..24e7ecf
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/ComparatorConstraint.java
@@ -0,0 +1,67 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import static jrummikub.ai.fdsolver.Satisfiability.*;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+
+import jrummikub.ai.fdsolver.Constraint;
+import jrummikub.ai.fdsolver.Propagator;
+import jrummikub.ai.fdsolver.Satisfiability;
+import jrummikub.ai.fdsolver.Var;
+
+public class ComparatorConstraint<T> implements Constraint {
+	Var<T> x, y;
+	Comparator<T> comparator, reverseComparator;
+	ComparatorPropagator<T> trueX, trueY, falseX, falseY;
+	boolean allowEqual;
+	
+	ComparatorConstraint(final Comparator<T> comparator, boolean allowEqual, Var<T> x, Var<T> y) {
+		this.x = x;
+		this.y = y;
+		this.comparator = comparator;
+		this.allowEqual = allowEqual;
+		reverseComparator = new Comparator<T>() {
+			@Override
+			public int compare(T o1, T o2) {
+				return comparator.compare(o2, o1);
+			}
+		};
+		trueX = new ComparatorPropagator<T>(comparator, allowEqual, x, y);
+		trueY = new ComparatorPropagator<T>(reverseComparator, allowEqual, y, x);
+		falseX = new ComparatorPropagator<T>(reverseComparator, !allowEqual, x, y);
+		falseY = new ComparatorPropagator<T>(comparator, !allowEqual, y, x);
+	}
+	
+	@Override
+	public Collection<Var<?>> getWatchedVars() {
+		return Arrays.<Var<?>>asList(x,y);
+	}
+
+	@Override
+	public Collection<Propagator> getPropagators(boolean negate) {
+		if (negate) {
+			return Arrays.<Propagator>asList(falseX,falseY);
+		} else {
+			return Arrays.<Propagator>asList(trueX,trueY);
+		}
+	}
+
+	@Override
+	public Satisfiability getSatisfiability() {
+		T maxX = Collections.max(x.getRange(), comparator);
+		T minY = Collections.min(y.getRange(), comparator);
+		if (comparator.compare(maxX, minY) < (allowEqual ? 1 : 0)) {
+			return TAUT;
+		}
+		T minX = Collections.min(x.getRange(), comparator);
+		T maxY = Collections.max(y.getRange(), comparator);
+		if (comparator.compare(maxY, minX) < (allowEqual ? 0 : 1)) {
+			return UNSAT;
+		}
+		return SAT;
+	}
+
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/ComparatorPropagator.java b/src/jrummikub/ai/fdsolver/constraint/ComparatorPropagator.java
new file mode 100644
index 0000000..b3a3089
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/ComparatorPropagator.java
@@ -0,0 +1,42 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+
+import jrummikub.ai.fdsolver.Propagator;
+import jrummikub.ai.fdsolver.Var;
+
+public class ComparatorPropagator<T> implements Propagator {
+	private Var<T> x, y;
+	private Comparator<T> comparator;
+	private boolean allowEqual;
+	public ComparatorPropagator(Comparator<T> comparator, boolean allowEqual, Var<T> x, Var<T> y) {
+		this.comparator = comparator;
+		this.allowEqual = allowEqual;
+		this.x = x;
+		this.y = y;
+	}
+
+	@Override
+	public Collection<Var<?>> getWatchedVars() {
+		return Arrays.<Var<?>>asList(y);
+	}
+
+	@Override
+	public void propagate() {
+		T maxY = Collections.max(y.getRange(), comparator);
+		
+		for(Iterator<T> i = x.iterator(); i.hasNext();) {
+			T value = i.next();
+			int comparision = comparator.compare(value, maxY);
+			if (comparision > 0 || comparision == 0 && !allowEqual) {
+				i.remove();
+			}
+		}
+	}
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/Filter.java b/src/jrummikub/ai/fdsolver/constraint/Filter.java
new file mode 100644
index 0000000..59c880a
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/Filter.java
@@ -0,0 +1,5 @@
+package jrummikub.ai.fdsolver.constraint;
+
+public interface Filter<T> {
+	public boolean accept(T value);
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/FilterConstraint.java b/src/jrummikub/ai/fdsolver/constraint/FilterConstraint.java
new file mode 100644
index 0000000..e676882
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/FilterConstraint.java
@@ -0,0 +1,65 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import static jrummikub.ai.fdsolver.Satisfiability.SAT;
+import static jrummikub.ai.fdsolver.Satisfiability.TAUT;
+import static jrummikub.ai.fdsolver.Satisfiability.UNSAT;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import jrummikub.ai.fdsolver.Constraint;
+import jrummikub.ai.fdsolver.Propagator;
+import jrummikub.ai.fdsolver.Satisfiability;
+import jrummikub.ai.fdsolver.Var;
+
+public class FilterConstraint<T> implements Constraint {
+	private Var<T> var;
+	private Propagator trueProp, falseProp;
+	private Filter<T> filter;
+
+	public FilterConstraint(final Filter<T> filter, Var<T> var) {
+		this.var = var;
+		this.filter = filter;
+		trueProp = new FilterPropagator<T>(filter, var);
+		falseProp = new FilterPropagator<T>(new Filter<T>() {
+			@Override
+			public boolean accept(T value) {
+				return !filter.accept(value);
+			}
+		}, var);
+	}
+
+	@Override
+	public Collection<Var<?>> getWatchedVars() {
+		return Arrays.<Var<?>> asList(var);
+	}
+
+	@Override
+	public Collection<Propagator> getPropagators(boolean negate) {
+		return Arrays.asList(negate ? falseProp : trueProp);
+	}
+
+	@Override
+	public Satisfiability getSatisfiability() {
+		boolean any = false;
+		boolean all = true;
+		
+		for (T value : var.getRange()) {
+			boolean accepted = filter.accept(value);
+			if (accepted) {
+				any = true;
+			} else {
+				all = false;
+			}
+		}
+		
+		if (all && any) {
+			return TAUT;
+		} else if (any) {
+			return SAT;
+		} else {
+			return UNSAT;
+		}
+	}
+
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/FilterPropagator.java b/src/jrummikub/ai/fdsolver/constraint/FilterPropagator.java
new file mode 100644
index 0000000..80518c9
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/FilterPropagator.java
@@ -0,0 +1,31 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Iterator;
+
+import jrummikub.ai.fdsolver.Propagator;
+import jrummikub.ai.fdsolver.Var;
+
+public class FilterPropagator<T> implements Propagator {
+	private Filter<T> filter;
+	private Var<T> var;
+	
+	public FilterPropagator(Filter<T> filter, Var<T> var) {
+		this.filter = filter;
+		this.var = var;	
+	}
+	
+	@Override
+	public Collection<Var<?>> getWatchedVars() {
+		return Arrays.<Var<?>>asList(var);
+	}
+
+	@Override
+	public void propagate() {
+		for(Iterator<T> i = var.iterator(); i.hasNext();) {
+			if(!filter.accept(i.next()))
+				i.remove();
+		}
+	}
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/GreaterThan.java b/src/jrummikub/ai/fdsolver/constraint/GreaterThan.java
new file mode 100644
index 0000000..9bdccd2
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/GreaterThan.java
@@ -0,0 +1,18 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import java.util.Comparator;
+
+import jrummikub.ai.fdsolver.Var;
+
+public class GreaterThan<T extends Comparable<T>> extends
+		ComparatorConstraint<T> {
+
+	public GreaterThan(boolean allowEqual, Var<T> x, Var<T> y) {
+		super(new Comparator<T>() {
+			@Override
+			public int compare(T o1, T o2) {
+				return o2.compareTo(o1);
+			}
+		}, allowEqual, x, y);
+	}
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/GreaterThanConst.java b/src/jrummikub/ai/fdsolver/constraint/GreaterThanConst.java
new file mode 100644
index 0000000..6b00ee3
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/GreaterThanConst.java
@@ -0,0 +1,15 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import jrummikub.ai.fdsolver.Var;
+
+public class GreaterThanConst<T extends Comparable<T>> extends
+		FilterConstraint<T> {
+	public GreaterThanConst(final boolean allowEqual, Var<T> x, final T y) {
+		super(new Filter<T>() {
+			@Override
+			public boolean accept(T value) {
+				return y.compareTo(value) < (allowEqual ? 1 : 0);
+			}
+		}, x);
+	}
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/LessThan.java b/src/jrummikub/ai/fdsolver/constraint/LessThan.java
new file mode 100644
index 0000000..b79252c
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/LessThan.java
@@ -0,0 +1,17 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import java.util.Comparator;
+
+import jrummikub.ai.fdsolver.Var;
+
+public class LessThan<T extends Comparable<T>> extends ComparatorConstraint<T> {
+
+	public LessThan(boolean allowEqual, Var<T> x, Var<T> y) {
+		super(new Comparator<T>() {
+			@Override
+			public int compare(T o1, T o2) {
+				return o1.compareTo(o2);
+			}
+		}, allowEqual, x, y);
+	}
+}
diff --git a/src/jrummikub/ai/fdsolver/constraint/LessThanConst.java b/src/jrummikub/ai/fdsolver/constraint/LessThanConst.java
new file mode 100644
index 0000000..18d8827
--- /dev/null
+++ b/src/jrummikub/ai/fdsolver/constraint/LessThanConst.java
@@ -0,0 +1,18 @@
+package jrummikub.ai.fdsolver.constraint;
+
+import java.util.Collection;
+
+import jrummikub.ai.fdsolver.Propagator;
+import jrummikub.ai.fdsolver.Solver;
+import jrummikub.ai.fdsolver.Var;
+
+public class LessThanConst<T extends Comparable<T>> extends FilterConstraint<T> {
+	public LessThanConst(final boolean allowEqual, Var<T> x, final T y) {
+		super(new Filter<T>() {
+			@Override
+			public boolean accept(T value) {
+				return value.compareTo(y) < (allowEqual ? 1 : 0);
+			}
+		}, x);
+	}
+}