Version bump:

first functional version of new function mapping.

src/main/java/de/srsoftware/web4rail/functions/Function.java

@@ -49,6 +49,10 @@ public abstract class Function extends BaseClass{
 		return null;	
 	}
 	
+	public boolean enabled() {
+		return enabled;
+	}
+	
 	public boolean enabled(Decoder decoder) {
 		return enabled;
 	}
@@ -101,8 +105,9 @@ public abstract class Function extends BaseClass{
 		return selector;
 	}
 
-	public void setState(boolean enabled) {
+	public Function setState(boolean enabled) {
 		this.enabled = enabled;
+		return this;
 	}
 
 	@Override

src/main/java/de/srsoftware/web4rail/functions/FunctionList.java

@@ -44,4 +44,13 @@ public class FunctionList extends HashSet<Function> implements Constants{
 		stream().filter(fun -> name.equals(fun.name())).forEach(fun -> fun.setState(enabled));
 		return this;
 	}
+
+
+	public HashSet<Function> with(String name) {
+		HashSet<Function> subset = new HashSet<>();
+		for (Function f: this) {
+			if (f.name().equals(name)) subset.add(f);
+		}
+		return subset;
+	}
 }

src/main/java/de/srsoftware/web4rail/functions/HeadLight.java

@@ -1,5 +1,14 @@
 package de.srsoftware.web4rail.functions;
 
-public class HeadLight extends DirectedFunction {
+import de.srsoftware.web4rail.devices.Decoder;
+import de.srsoftware.web4rail.moving.Locomotive;
 
+public class HeadLight extends DirectedFunction {
+	@Override
+	public boolean enabled(Decoder decoder) {
+		Locomotive loco = decoder.parent();
+		if (isNull(loco) || !loco.isFirst()) return false;
+		boolean result = isSet(loco) && loco.isFirst() && super.enabled(decoder);
+		return result;
+	}
 }

src/main/java/de/srsoftware/web4rail/functions/TailLight.java

@@ -1,5 +1,13 @@
 package de.srsoftware.web4rail.functions;
 
-public class TailLight extends DirectedFunction {
+import de.srsoftware.web4rail.devices.Decoder;
+import de.srsoftware.web4rail.moving.Locomotive;
 
+public class TailLight extends DirectedFunction {
+	@Override
+	public boolean enabled(Decoder decoder) {
+		Locomotive loco = decoder.parent();
+		if (isNull(loco) || !loco.isLast()) return false;
+		return super.enabled(decoder);
+	}
 }