diff --git a/experimental/uloapi/pom.xml b/experimental/uloapi/pom.xml
index fc4516873b8c7c05d087abdb3b7fae52cdc581fc..f468e7e9acbdc4bb021121a4782641a3646545bd 100644
--- a/experimental/uloapi/pom.xml
+++ b/experimental/uloapi/pom.xml
@@ -18,7 +18,7 @@
<configuration>
<archive>
<manifest>
- <mainClass>info.mathhub.uloapi.Main</mainClass>
+ <mainClass>info.mathhub.uloapi.rest.Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
@@ -41,7 +41,7 @@
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
- <mainClass>info.mathhub.uloapi.Main</mainClass>
+ <mainClass>info.mathhub.uloapi.rest.Main</mainClass>
</configuration>
</plugin>
</plugins>
@@ -51,7 +51,7 @@
<dependency>
<groupId>com.sparkjava</groupId>
<artifactId>spark-core</artifactId>
- <version>2.5</version>
+ <version>2.9.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
@@ -68,5 +68,10 @@
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
+ <dependency>
+ <groupId>com.google.code.gson</groupId>
+ <artifactId>gson</artifactId>
+ <version>2.8.6</version>
+ </dependency>
</dependencies>
</project>
\ No newline at end of file
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/Main.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/Main.java
deleted file mode 100644
index 03e9e8c7e0df60fc59091524f355b488b2c07821..0000000000000000000000000000000000000000
--- a/experimental/uloapi/src/main/java/info/mathhub/uloapi/Main.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package info.mathhub.uloapi;
-
-import static spark.Spark.*;
-
-public class Main {
- private Main() {};
-
- public static void main(String[] args) {
- get("/", Routes.index);
- get("/favicon.ico", Routes.createError(404));
- }
-}
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/Routes.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/Routes.java
deleted file mode 100644
index a1d9b2a63854e0d238e35d5c4609a832870086d0..0000000000000000000000000000000000000000
--- a/experimental/uloapi/src/main/java/info/mathhub/uloapi/Routes.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package info.mathhub.uloapi;
-
-import spark.*;
-
-/**
- * This class contains all routes of our application.
- */
-public class Routes {
- private Routes() {};
-
- public static final Route index = (Request request, Response response) -> {
- return "<h1>Index /</h1>";
- };
-
- public static Route createError(int status) {
- return (Request request, Response response) -> {
- response.status(status);
- return String.format("Error %d", status);
- };
- }
-}
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/query/Query.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/query/Query.java
new file mode 100644
index 0000000000000000000000000000000000000000..c3d861222bf8b3c884ab43102b30452eb1c34760
--- /dev/null
+++ b/experimental/uloapi/src/main/java/info/mathhub/uloapi/query/Query.java
@@ -0,0 +1,7 @@
+package info.mathhub.uloapi.query;
+
+public class Query {
+ public Statistics getStatistics() {
+ return new Statistics(10);
+ }
+}
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/query/Statistics.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/query/Statistics.java
new file mode 100644
index 0000000000000000000000000000000000000000..f32b9dbb4063094e28e3b677d17b2721cbbe45db
--- /dev/null
+++ b/experimental/uloapi/src/main/java/info/mathhub/uloapi/query/Statistics.java
@@ -0,0 +1,15 @@
+package info.mathhub.uloapi.query;
+
+/**
+ * Contains statistic information about the backing storage.
+ */
+public class Statistics {
+ /**
+ * The number of triplets in the backing storage.
+ */
+ public long numTriplets;
+
+ Statistics(int numTriplets) {
+ this.numTriplets = numTriplets;
+ }
+}
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Filters.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Filters.java
new file mode 100644
index 0000000000000000000000000000000000000000..26fca38491d15c921b4af8c9fca1bbdb7d025fc1
--- /dev/null
+++ b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Filters.java
@@ -0,0 +1,13 @@
+package info.mathhub.uloapi.rest;
+
+import spark.Filter;
+import spark.Request;
+import spark.Response;
+
+public class Filters {
+ private Filters() {};
+
+ public static final Filter setJsonContentType = (Request request, Response response) -> {
+ response.type("application/json");
+ };
+}
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/JsonTransformer.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/JsonTransformer.java
new file mode 100644
index 0000000000000000000000000000000000000000..cd28154467659be765b3c30485523630481d6a45
--- /dev/null
+++ b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/JsonTransformer.java
@@ -0,0 +1,17 @@
+package info.mathhub.uloapi.rest;
+
+import com.google.gson.Gson;
+import spark.ResponseTransformer;
+
+/**
+ * A {@link spark.ResponseTransformer} that converts everything to
+ * JSON.
+ */
+public class JsonTransformer implements ResponseTransformer {
+ private final Gson instance = new Gson();
+
+ @Override
+ public String render(Object model) throws Exception {
+ return this.instance.toJson(model);
+ }
+}
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Main.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Main.java
new file mode 100644
index 0000000000000000000000000000000000000000..496dc5c8dbb26f53a596c438d60363c043d04dc4
--- /dev/null
+++ b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Main.java
@@ -0,0 +1,19 @@
+package info.mathhub.uloapi.rest;
+
+import static spark.Spark.*;
+
+/**
+ * Entry point of the JSON/REST API for the underlying ULO/RDF store.
+ */
+public class Main {
+ private Main() {};
+
+ public static void main(String[] args) {
+ get("/", Routes.index);
+ get("/statistics", Routes.statistics, new JsonTransformer());
+ get("/name/:name", Routes.name, new JsonTransformer());
+ notFound(Routes.notFound);
+
+ after(Filters.setJsonContentType);
+ }
+}
diff --git a/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Routes.java b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Routes.java
new file mode 100644
index 0000000000000000000000000000000000000000..a7ba8fc0ac943b93847929d71c3144d7bb24c790
--- /dev/null
+++ b/experimental/uloapi/src/main/java/info/mathhub/uloapi/rest/Routes.java
@@ -0,0 +1,48 @@
+package info.mathhub.uloapi.rest;
+
+import info.mathhub.uloapi.query.Query;
+import org.eclipse.jetty.http.HttpStatus;
+import spark.*;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * This class contains all routes of our application.
+ */
+public class Routes {
+ private Routes() {};
+
+ public static final Route index = (Request request, Response response) -> {
+ return "{}";
+ };
+
+ public static final Route statistics = (Request request, Response response) -> {
+ return new Query().getStatistics();
+ };
+
+ public static final Route name = (Request request, Response response) -> {
+ final Map<String, Object> json = new HashMap<>();
+
+ json.put("name", request.params(":name"));
+ json.put("attributes", request.attributes());
+ json.put("ip", request.ip());
+
+ return json;
+ };
+
+ public static final Route notFound = (Request request, Response response) -> {
+ return createError(HttpStatus.NOT_FOUND_404);
+ };
+
+ public static final Route notAcceptable = (Request request, Response response) -> {
+ return createError(HttpStatus.NOT_ACCEPTABLE_406);
+ };
+
+ private static Route createError(int status) {
+ return (Request request, Response response) -> {
+ response.status(status);
+ return String.format("Error %d", status);
+ };
+ }
+}