Abstraktion für Listener API erstellt

EventGenerator soll als einheitlicher Unterbau zur Umstzung von Listener Patterns dienen. Damit sollen Listener wie AudioListener oder AnimationListener umgesetzt werden.

test/src/schule/ngb/zm/events/EventGeneratorTest.java

@@ -0,0 +1,65 @@
+package schule.ngb.zm.events;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class EventGeneratorTest {
+
+	class TestEvent {
+
+		private String data;
+
+		private String type;
+
+		public TestEvent( String data, boolean isStart ) {
+			this.data = data;
+			this.type = isStart ? "start" : "stop";
+		}
+
+		public String getData() {
+			return data;
+		}
+
+		public String getType() {
+			return type;
+		}
+
+	}
+
+	interface TestListener extends Listener<TestEvent> {
+
+		void startEvent( TestEvent t );
+
+		void stopEvent( TestEvent t );
+
+	}
+
+	@Test
+	void eventRegistry() {
+		EventGenerator<TestEvent, TestListener> gen = new EventGenerator<>();
+
+		gen.registerEventType("start", ( event, listener ) -> listener.startEvent(event));
+		gen.registerEventType("stop", ( event, listener ) -> listener.stopEvent(event));
+
+		gen.addListener(new TestListener() {
+			@Override
+			public void startEvent( TestEvent t ) {
+				assertEquals("start", t.getType());
+				assertTrue(t.getData().startsWith("Start Event"));
+			}
+
+			@Override
+			public void stopEvent( TestEvent t ) {
+				assertEquals("stop", t.getType());
+				assertTrue(t.getData().startsWith("Stop Event"));
+			}
+		});
+
+		gen.dispatchEvent("start", new TestEvent("Start Event 1", true));
+		gen.dispatchEvent("stop", new TestEvent("Stop Event 1", false));
+		gen.dispatchEvent("stop", new TestEvent("Stop Event 2", false));
+		gen.dispatchEvent("start", new TestEvent("Start Event 2", true));
+	}
+
+}