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

1 files changed, 31 insertions, 0 deletions

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();
+		}
+	}
+}