setCell function

app/src/main/java/sudoku/Sudoku.java

@@ -21,6 +21,19 @@ public class Sudoku {
 		this.constraints = constraints;
 	}
 
+	/**
+	 * Try to place a cell at the given coordinate
+	 * @return false if it can't be done
+	 */
+	public boolean setCellSymbol(int x, int y, int value) {
+		for (IConstraint constraint : this.constraints) {
+			if (!constraint.canBePlaced(this, x, y, value)) {
+				return false;
+			}
+		}
+		return true;
+	}
+
 	public Cell getCell(int x, int y) {
 		int index = y * getSize() + x;
 		assert(index < getSize() * getSize());