beaucoup

app/src/main/java/sudoku/constraint/IConstraint.java

@@ -0,0 +1,22 @@
+package sudoku.constraint;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import sudoku.Sudoku;
+
+public interface IConstraint {
+
+	boolean canBePlaced(final Sudoku s, int x, int y, int newSymbolIndex);
+
+	default List<Integer> getPossibleSymbols(final Sudoku s, int x, int y) {
+		List<Integer> possibilities = new ArrayList<>();
+		for (int i = 0; i < s.getSize(); i++) {
+			if (canBePlaced(s, x, y, i)) {
+				possibilities.add(i);
+			}
+		}
+		return possibilities;
+	}
+
+}