Data commit

Task/Intersecting-number-wheels/Java/intersecting-number-wheels.java

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+package intersectingNumberWheels;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.IntStream;
+
+public class WheelController {
+	private static final String IS_NUMBER = "[0-9]";
+	private static final int TWENTY = 20;
+	private static Map<String, WheelModel> wheelMap;
+
+	public static void advance(String wheel) {
+		WheelModel w = wheelMap.get(wheel);
+		if (w.list.get(w.position).matches(IS_NUMBER)) {
+			w.printThePosition();
+			w.advanceThePosition();
+		} else {
+			String wheelName = w.list.get(w.position);
+			advance(wheelName);
+			w.advanceThePosition();
+		}
+	}
+
+	public static void run() {
+		System.out.println(wheelMap);
+		IntStream.rangeClosed(1, TWENTY).forEach(i -> advance("A"));
+		System.out.println();
+		wheelMap.clear();
+	}
+
+	public static void main(String[] args) {
+		wheelMap = new HashMap<>();
+		wheelMap.put("A", new WheelModel("A", "1", "2", "3"));
+		run();
+		wheelMap.put("A", new WheelModel("A", "1", "B", "2"));
+		wheelMap.put("B", new WheelModel("B", "3", "4"));
+		run();
+		wheelMap.put("A", new WheelModel("A", "1", "D", "D"));
+		wheelMap.put("D", new WheelModel("D", "6", "7", "8"));
+		run();
+		wheelMap.put("A", new WheelModel("A", "1", "B", "C"));
+		wheelMap.put("B", new WheelModel("B", "3", "4"));
+		wheelMap.put("C", new WheelModel("C", "5", "B"));
+		run();
+	}
+
+}
+
+class WheelModel {
+	String name;
+	List<String> list;
+	int position;
+	int endPosition;
+	private static final int INITIAL = 0;
+
+	public WheelModel(String name, String... values) {
+		super();
+
+		this.name = name.toUpperCase();
+		this.list = new ArrayList<>();
+		for (String value : values) {
+			list.add(value);
+		}
+		this.position = INITIAL;
+		this.endPosition = this.list.size() - 1;
+	}
+
+	@Override
+	public String toString() {
+		return list.toString();
+	}
+
+	public void advanceThePosition() {
+		if (this.position == this.endPosition) {
+			this.position = INITIAL;// new beginning
+		} else {
+			this.position++;// advance position
+		}
+	}
+
+	public void printThePosition() {
+		System.out.print(" " + this.list.get(position));
+	}
+}