working in first importer: JenaRosenkeller

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.cal.api/src/main/java/de/srsoftware/cal/api/Importer.java

@@ -1,6 +1,7 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.cal.api;
 
+import java.io.IOException;
 import java.util.List;
 
 /**
@@ -17,5 +18,5 @@ public interface Importer {
 	 * get the list of appointments from the source associated with this importer
 	 * @return a list of appointments
 	 */
-	List<Appointment> fetch();
+	List<Appointment> fetch() throws IOException;
 }

de.srsoftware.cal.app/build.gradle.kts

@@ -0,0 +1,6 @@
+description = "OpenCloudCal : Application"
+
+dependencies {
+    implementation(project(":de.srsoftware.cal.api"))
+    implementation(project(":de.srsoftware.cal.importer"))
+}

de.srsoftware.cal.app/src/main/java/de/srsoftware/cal/app/Application.java

@@ -0,0 +1,12 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.cal.app;
+
+import de.srsoftware.cal.importer.JenaRosenkeller;
+import java.io.IOException;
+
+public class Application {
+	public static void main(String[] args) throws IOException {
+		var rosenkeller = new JenaRosenkeller();
+		rosenkeller.fetch();
+	}
+}

de.srsoftware.cal.import/build.gradle.kts

@@ -1,4 +0,0 @@
-description = "OpenCloudCal : Importers"
-
-dependencies {
-}

de.srsoftware.cal.importer/build.gradle.kts

@@ -0,0 +1,8 @@
+description = "OpenCloudCal : Importers"
+
+dependencies {
+    implementation(project(":de.srsoftware.cal.api"))
+    implementation("de.srsoftware:tools.optionals:1.0.0")
+    implementation("de.srsoftware:tools.util:1.1.0")
+    implementation("de.srsoftware:tools.web:1.2.1")
+}

de.srsoftware.cal.importer/src/main/java/de/srsoftware/cal/importer/JenaRosenkeller.java

@@ -0,0 +1,91 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.cal.importer;
+
+import static de.srsoftware.tools.Optionals.nullable;
+import static java.util.Optional.empty;
+import static java.util.function.Predicate.not;
+
+import de.srsoftware.cal.api.Appointment;
+import de.srsoftware.cal.api.Importer;
+import de.srsoftware.tools.Payload;
+import de.srsoftware.tools.Tag;
+import de.srsoftware.tools.XMLParser;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Stream;
+
+public class JenaRosenkeller implements Importer {
+	@Override
+	public String description() {
+		return "Events von der Seite rosenkeller.org importieren";
+	}
+
+	@Override
+	public List<Appointment> fetch() throws IOException {
+		var url     = "https://rosenkeller.org/de/programm";
+		var listUrl = url(url);
+		if (listUrl.isEmpty()) throw new RuntimeException("Failed to fetch %s".formatted(url));
+
+		var input  = listUrl.get().openConnection().getInputStream();
+		input      = XMLParser.preload(input);
+		var result = XMLParser.parse(input);
+		input.close();
+		List<Appointment> appointments = nullable(result)  //
+				     .filter(o -> o instanceof Payload<Tag>)
+				     .map(o -> (Payload<Tag>)o)
+				     .map(Payload::get)
+				     .stream()
+				     .flatMap(JenaRosenkeller::findEventUrls)
+				     .map(JenaRosenkeller::url)
+				     .filter(Optional::isPresent)
+				     .map(Optional::get)
+				     .map(JenaRosenkeller::loadEvent)
+				     .filter(Optional::isPresent)
+				     .map(Optional::get)
+				     .toList();
+
+		System.out.println(appointments);
+		return appointments;
+	}
+
+	private static Optional<Appointment> loadEvent(URL url) {
+		try {
+			var input  = url.openConnection().getInputStream();
+			input      = XMLParser.preload(input);
+			var result = XMLParser.parse(input);
+			input.close();
+			if (result instanceof Payload<Tag> payload) {
+				var tag = payload.get();
+				tag.find("class", s -> s.endsWith("single-event-title"))  //
+				    .stream()
+				    .map(Tag::children)
+				    .filter(not(List::isEmpty))
+				    .map(List::getFirst)
+				    .map(Tag::toString)
+				    .forEach(System.out::println);
+			}
+			return empty();
+		} catch (IOException e) {
+			e.printStackTrace();
+			return empty();
+		}
+	}
+
+	private static Stream<String> findEventUrls(Tag tag) {
+		return tag.find("id", val -> val.startsWith("event-")).stream().map(t -> t.find("class", "ect-event-url" ::equals)).flatMap(List::stream).map(t -> t.get("href"));
+	}
+
+	private static Optional<URL> url(String url) {
+		try {
+			return Optional.of(new URI(url).toURL());
+		} catch (MalformedURLException | URISyntaxException e) {
+			e.printStackTrace();
+			return empty();
+		}
+	}
+}

settings.gradle.kts

@@ -1,6 +1,6 @@
 rootProject.name = "de.srsoftware.cal"
-include("de.srsoftware.cal.db")
-include("de.srsoftware.cal.import")
-include("de.srsoftware.cal.web")
-include("de.srsoftware.cal.web")
+include("de.srsoftware.cal.app")
 include("de.srsoftware.cal.api")
+include("de.srsoftware.cal.db")
+include("de.srsoftware.cal.importer")
+include("de.srsoftware.cal.web")