diff --git a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Main.java b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Main.java
index e90ef368092907e86e1b5f5f8c3abfe8568a0a09..0257e6783da17cb285d7663e521ec57f99572b10 100644
--- a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Main.java
+++ b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Main.java
@@ -18,6 +18,7 @@ public class Main {
get("/queries", Routes.queries, new FreeMarkerEngine());
get("/explore", Routes.explore, new FreeMarkerEngine());
get("/explore/contributor/:contributor", Routes.exploreContributor, new FreeMarkerEngine());
+ get("/explore/node/:base64uri", Routes.exploreNode, new FreeMarkerEngine());
internalServerError(Errors.internalServerError);
notFound(Errors.notFound);
diff --git a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/PrintableIRI.java b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/PrintableIRI.java
new file mode 100644
index 0000000000000000000000000000000000000000..7ef356c2039ca053544d4b17dcca475ed25f5540
--- /dev/null
+++ b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/PrintableIRI.java
@@ -0,0 +1,59 @@
+package info.mathhub.uloapi.html;
+
+import org.eclipse.rdf4j.model.IRI;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Wrapper around {@link IRI} that provides additional
+ * methods for use in Freemarker templates.
+ */
+public class PrintableIRI implements IRI {
+ private final IRI original;
+
+ public PrintableIRI(IRI original) {
+ this.original = original;
+ }
+
+ /**
+ * Convert a list of {@link IRI} to {@link PrintableIRI}.
+ */
+ public static List<PrintableIRI> convert(List<IRI> originals) {
+ return originals.stream().map(PrintableIRI::new).collect(Collectors.toList());
+ }
+
+ @Override
+ public String toString() {
+ return this.original.toString();
+ }
+
+ @Override
+ public String getNamespace() {
+ return this.original.getNamespace();
+ }
+
+ @Override
+ public String getLocalName() {
+ return this.original.getLocalName();
+ }
+
+ @Override
+ public String stringValue() {
+ return this.original.stringValue();
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ return this.original.equals(o);
+ }
+
+ @Override
+ public int hashCode() {
+ return this.original.hashCode();
+ }
+
+ public String toBase64() {
+ return Base64.encode(this.toString());
+ }
+}
diff --git a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Routes.java b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Routes.java
index 1ff7c5ad00d645f9fc59e7480921a12bc82ad8a8..9f1d9a6f56036776e9714d089f6b0f84d4c667a1 100644
--- a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Routes.java
+++ b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/html/Routes.java
@@ -67,7 +67,7 @@ public class Routes {
final Query query = Query.getSingleton();
final String contributor = request.params("contributor");
- final List<IRI> contributions = query.getContributions(contributor);
+ final List<PrintableIRI> contributions = PrintableIRI.convert(query.getContributions(contributor));
final Map<String, Object> model = new HashMap<>();
model.put("contributor", contributor);
@@ -76,6 +76,21 @@ public class Routes {
return new ModelAndView(withGlobals(model), "explore_contributor.flt");
};
+ public static final TemplateViewRoute exploreNode = (Request request, Response response) -> {
+ final Query query = Query.getSingleton();
+
+ final String base64uri = request.params("base64uri");
+ final String uri = Base64.decode(base64uri);
+
+ final List<PrintableIRI> uses = PrintableIRI.convert(query.getUses(uri));
+
+ final Map<String, Object> model = new HashMap<>();
+ model.put("uri", uri);
+ model.put("uses", uses);
+
+ return new ModelAndView(withGlobals(model), "explore_node.flt");
+ };
+
/**
* Add some global values we always need to argument {@code model}.
*
diff --git a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/query/IRIs.java b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/query/IRIs.java
new file mode 100644
index 0000000000000000000000000000000000000000..8d7f6a69606e23c0cdde060d74fd020771434a9a
--- /dev/null
+++ b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/query/IRIs.java
@@ -0,0 +1,24 @@
+package info.mathhub.uloapi.query;
+
+import org.eclipse.rdf4j.model.IRI;
+import org.eclipse.rdf4j.model.ValueFactory;
+import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
+
+public class IRIs {
+ private IRIs() {}
+
+ /**
+ * Create an {@link IRI} from argument {@code value}.
+ *
+ * @param value The argument to turn into an {@link IRI}.
+ * @return An {@link IRI} that contains argument {@code value}.
+ */
+ public static IRI fromString(String value) {
+ if (value == null) {
+ throw new NullPointerException("argument value must not be null");
+ }
+
+ final ValueFactory valueFactory = SimpleValueFactory.getInstance();
+ return valueFactory.createIRI(value);
+ }
+}
diff --git a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/query/Query.java b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/query/Query.java
index 127246c480aa0c9ffad0a8bdea621a343a7bafa2..3b694472af0f8422ae274664e6c569088d3545d9 100644
--- a/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/query/Query.java
+++ b/src/ulo-storage-applications/src/main/java/info/mathhub/uloapi/query/Query.java
@@ -167,4 +167,34 @@ public class Query {
return GraphDB.execute(this.serverUrl, this.repository, operation);
}
+
+ /**
+ * Return a list of works used by another given node.
+ *
+ * @param nodeuri The URI of the node.
+ */
+ public List<IRI> getUses(String nodeuri) {
+ final GraphDB.Operation<List<IRI>> operation = (manager, repository, connection) -> {
+ final Set<IRI> uses = new HashSet<>();
+ final IRI subject = IRIs.fromString(nodeuri);
+
+ final RepositoryResult<Statement> result = connection.getStatements(subject, ULO.uses, null);
+
+ for (final Statement statement : result) {
+ final Value object = statement.getObject();
+
+ if (!(object instanceof IRI)) {
+ log.warn("found object that is not an IRI");
+ continue;
+ }
+
+ final IRI asIri = (IRI) object;
+ uses.add(asIri);
+ }
+
+ return new ArrayList<>(uses);
+ };
+
+ return GraphDB.execute(this.serverUrl, this.repository, operation);
+ }
}
diff --git a/src/ulo-storage-applications/src/main/resources/spark/template/freemarker/explore_contributor.flt b/src/ulo-storage-applications/src/main/resources/spark/template/freemarker/explore_contributor.flt
index 8bb396b12a3507f8a9b4754e5994a559ffa377aa..1c0c2d7d3593c2c09b29e701c24066fbca5d0b7a 100644
--- a/src/ulo-storage-applications/src/main/resources/spark/template/freemarker/explore_contributor.flt
+++ b/src/ulo-storage-applications/src/main/resources/spark/template/freemarker/explore_contributor.flt
@@ -16,7 +16,9 @@
<ul>
<#list contributions as contribution>
<li>
- <code>${contribution}</code>
+ <a href="/explore/node/${contribution.toBase64()?url}">
+ <code>${contribution}</code>
+ </a>
</li>
</#list>
</ul>
diff --git a/src/ulo-storage-applications/src/main/resources/spark/template/freemarker/explore_node.flt b/src/ulo-storage-applications/src/main/resources/spark/template/freemarker/explore_node.flt
new file mode 100644
index 0000000000000000000000000000000000000000..7d2caae0d490b73c03c7f430bfed2e361b1060b3
--- /dev/null
+++ b/src/ulo-storage-applications/src/main/resources/spark/template/freemarker/explore_node.flt
@@ -0,0 +1,35 @@
+<#ftl output_format="HTML" auto_esc=false>
+<#setting url_escaping_charset='UTF-8'>
+
+<#include "base.flt">
+
+<#macro page_title>
+ Explore Node
+</#macro>
+
+<#macro page_main>
+
+ <h2>Explore Node</h2>
+
+ <h3>URI</h3>
+
+ <ul>
+ <li>
+ <code>${uri}</code>
+ </li>
+ </ul>
+
+ <h3>Node uses...</h3>
+
+ <ul>
+ <#list uses as use>
+ <li>
+ <a href="/explore/node/${use.toBase64()?url}">
+ <code>${use}</code>
+ </a>
+ </li>
+ </#list>
+ </ul>
+</#macro>
+
+<@display_page/>