bugfixes after refactoring

src/main/java/de/srsoftware/web4rail/tiles/Bridge.java

@@ -3,11 +3,16 @@ package de.srsoftware.web4rail.tiles;
 import java.io.IOException;
 import java.util.Map;
 
+import org.json.JSONObject;
+
 import de.srsoftware.tools.Tag;
 import de.srsoftware.web4rail.Connector;
+import de.srsoftware.web4rail.Route;
 import de.srsoftware.web4rail.Window;
+import de.srsoftware.web4rail.moving.Train;
 
 public abstract class Bridge extends Tile {
+	private static final String COUNTERPART = "counterpart";
 	private static Bridge pendingConnection = null;
 	protected Bridge counterpart = null;
 	
@@ -32,6 +37,44 @@ public abstract class Bridge extends Tile {
 	}
 	
 	protected abstract Connector connector();
+	
+	@Override
+	public JSONObject json() {
+		JSONObject json = super.json();
+		if (isSet(counterpart)) json.put(COUNTERPART, counterpart.id().toString());
+		return json;
+	}
+	
+	@Override
+	protected Tile load(JSONObject json) throws IOException {
+		if (json.has(COUNTERPART)) {
+			new Thread() {
+				@Override
+				public void run() {
+					try {
+						sleep(1000);
+					} catch (InterruptedException e) {
+						e.printStackTrace();
+					}
+					counterpart = (Bridge) plan.get(Id.from(json, COUNTERPART), false);
+				}
+			}.start();
+		}
+		return super.load(json);
+	}
+	
+	public Tile set(Train train) {
+		super.set(train);
+		if (isSet(counterpart) && counterpart.train != train) counterpart.set(train);
+		return this;
+	}
+	
+	@Override
+	public Tile setRoute(Route route) {
+		super.setRoute(route);
+		if (isSet(counterpart) && counterpart.route != route) counterpart.setRoute(route);
+		return this;
+	}
 
 	@Override
 	public Window propMenu() {