demo-jetty: custom converter example

checkstyle_checks.xml

@@ -104,9 +104,9 @@
 		<!-- Checks for Size Violations. -->
 		<!-- See http://checkstyle.sf.net/config_sizes.html -->
 		<module name="MethodLength" />
-		<module name="ParameterNumber">
+		<!--  module name="ParameterNumber">
 			<property name="max" value="10" />
-		</module>
+		</module -->
 
 		<!-- Checks for whitespace -->
 		<!-- See http://checkstyle.sf.net/config_whitespace.html -->

demo-jetty/src/main/java/net/cactusthorn/routing/demo/jetty/Application.java

@@ -7,6 +7,8 @@
 
 import net.cactusthorn.routing.demo.jetty.dagger.*;
 
+import java.time.LocalDate;
+
 import javax.servlet.MultipartConfigElement;
 
 import org.eclipse.jetty.server.*;
@@ -32,6 +34,7 @@ public static void main(String... args) {
             .addProducer("application/json", new SimpleGsonProducer())
             .addConsumer("application/json", new SimpleGsonConsumer())
             .addProducer("text/html", new SimpleThymeleafProducer("/thymeleaf/"))
+            .addConverter(LocalDate.class, new LocalDateConverter())
             .build();
         // @formatter:on
 

demo-jetty/src/main/java/net/cactusthorn/routing/demo/jetty/LocalDateConverter.java

@@ -0,0 +1,27 @@
+package net.cactusthorn.routing.demo.jetty;
+
+import net.cactusthorn.routing.RequestData;
+import net.cactusthorn.routing.convert.Converter;
+import net.cactusthorn.routing.convert.ConverterException;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
+
+public class LocalDateConverter implements Converter {
+
+    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("ddMMyyyy");
+
+    @Override //
+    public LocalDate convert(RequestData requestData, Class<?> type, String value) throws ConverterException {
+        if (value == null || value.trim().isEmpty()) {
+            return null;
+        }
+        try {
+            return LocalDate.parse(value, FORMATTER);
+        } catch (DateTimeParseException e) {
+            throw new ConverterException("LocalDate converting failed", e);
+        }
+    }
+
+}

demo-jetty/src/main/java/net/cactusthorn/routing/demo/jetty/entrypoint/SimpleEntryPoint.java

@@ -2,6 +2,7 @@
 
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.time.LocalDate;
 
 import javax.inject.Inject;
 
@@ -42,4 +43,9 @@ public String empty(@PathParam("var") @DefaultValue("DEFAULT") String sss) {
     public Response seeother() throws URISyntaxException {
         return Response.builder().seeOther(new URI("/rest/api/test30?test=33.45")).build();
     }
+
+    @GET @Path("/localdate/{date : \\d{8}}") //
+    public String localdate(@PathParam("date") LocalDate date) throws URISyntaxException {
+        return date.toString();
+    }
 }