implemented bridge

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

@@ -0,0 +1,59 @@
+package de.srsoftware.web4rail.tiles;
+
+import java.io.IOException;
+import java.util.Map;
+
+import de.srsoftware.tools.Tag;
+import de.srsoftware.web4rail.Connector;
+import de.srsoftware.web4rail.Window;
+import de.srsoftware.web4rail.tags.Button;
+import de.srsoftware.web4rail.tiles.Turnout.State;
+
+public abstract class Bridge extends Tile {
+	private static Bridge pendingConnection = null;
+	protected Bridge counterpart = null;
+	
+	@Override
+	public Object click() throws IOException {
+		if (pendingConnection != null) return connect();
+		return super.click();
+	}
+	
+	private Object connect() {
+		if (this == pendingConnection) return t("Cannot connect {} to itself!",this);
+		if (isSet(counterpart)) {
+			counterpart.counterpart = null; // drop other connection
+			plan.place(counterpart);
+		}
+		counterpart = pendingConnection;
+		counterpart.counterpart = this;
+		pendingConnection = null;
+		plan.place(this);
+		plan.place(counterpart);
+		return t("Connected {} and {}.",this,counterpart);
+	}
+	
+	protected abstract Connector connector();
+
+	@Override
+	public Window propMenu() {
+		Window win = super.propMenu();
+		Map<String, String> props = Map.of(REALM,REALM_PLAN,ID,id(),ACTION,ACTION_CONNECT);
+		new Tag("h4").content("Counterpart").addTo(win);
+		new Tag("p").content(isSet(counterpart) ? t("Connected to {}.",counterpart) : t("Not connected to other bridge part!")).addTo(win);
+		new Button(t("Select counterpart"), props).addTo(win);
+		return win;
+	}
+
+	public Object requestConnect() {
+		pendingConnection = this;
+		return t("Click other bridge to connect to!");
+	}
+	
+	@Override
+	public Tag tag(Map<String, Object> replacements) throws IOException {
+		Tag tag = super.tag(replacements);
+		if (isNull(counterpart)) tag.clazz(tag.get("class")+" disconnected");
+		return tag;
+	}
+}