diff options
Diffstat (limited to 'src/jrummikub/ai/fdsolver/constraint/SameConstraint.java')
-rw-r--r-- | src/jrummikub/ai/fdsolver/constraint/SameConstraint.java | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/src/jrummikub/ai/fdsolver/constraint/SameConstraint.java b/src/jrummikub/ai/fdsolver/constraint/SameConstraint.java deleted file mode 100644 index 7fc0025..0000000 --- a/src/jrummikub/ai/fdsolver/constraint/SameConstraint.java +++ /dev/null @@ -1,69 +0,0 @@ -package jrummikub.ai.fdsolver.constraint; - -import java.util.Arrays; -import java.util.Collection; -import java.util.Collections; -import java.util.HashSet; -import java.util.Iterator; - -import jrummikub.ai.fdsolver.Constraint; -import jrummikub.ai.fdsolver.Propagator; -import jrummikub.ai.fdsolver.Satisfiability; -import jrummikub.ai.fdsolver.Var; - -public class SameConstraint<T> extends Constraint { - private Var<T> x, y; - Propagator propX, propY; - - public SameConstraint(Var<T> x, Var<T> y) { - this.x = x; - this.y = y; - propX = new SameProp<T>(x, y); - propY = new SameProp<T>(y, x); - } - - @Override - public Collection<Var<?>> getWatchedVars() { - return Arrays.<Var<?>> asList(x, y); - } - - private class SameProp<T> implements Propagator { - private Var<T> x, y; - public SameProp(Var<T> x, Var<T> y) { - this.x = x; - this.y = y; - } - - @Override - public Collection<Var<?>> getWatchedVars() { - return Arrays.<Var<?>>asList(y); - } - - @Override - public void propagate() { - for(Iterator<T> i = x.iterator(); i.hasNext();) { - if(!y.getRange().contains(i.next())) { - i.remove(); - } - } - } - } - - - @Override - public Collection<Propagator> getPropagators(boolean negate) { - return Arrays.asList(propX, propY); - } - - @Override - public Satisfiability getSatisfiability() { - if (Collections.disjoint(x.getRange(), y.getRange())) { - return Satisfiability.UNSAT; - } else if (x.getRange().size() == 1 && y.getRange().size() == 1) { - return Satisfiability.TAUT; - } else { - return Satisfiability.SAT; - } - } - -} |