Reproduce issue #154

sparql-anything-it/src/test/java/com/github/sparqlanything/it/Issues.java

@@ -43,6 +43,8 @@
 import org.apache.jena.query.ResultSet;
 import org.apache.jena.query.ResultSetFormatter;
 import org.apache.jena.query.Syntax;
+import org.apache.jena.rdf.model.Model;
+import org.apache.jena.sparql.core.DatasetGraph;
 import org.apache.jena.sparql.engine.main.QC;
 import org.junit.Assert;
 import org.junit.Ignore;
@@ -196,4 +198,23 @@ public void testIssue114() throws IOException, URISyntaxException {
 		assertEquals(Sets.newHashSet("b", "d", "c"), slots);
 	}
 
+	/**
+	 * See https://github.com/SPARQL-Anything/sparql.anything/issues/154
+	 *
+	 * @throws URISyntaxException
+	 * @throws IOException
+	 */
+	@Ignore
+	@Test
+	public void testIssue154() throws URISyntaxException, IOException {
+		String queryStr = IOUtils.toString(getClass().getClassLoader().getResource("issues/e.sparql").toURI(), StandardCharsets.UTF_8);
+		String location = getClass().getClassLoader().getResource("issues/a00002-1036.xml").toURI().toString();
+		Query query = QueryFactory.create(queryStr.replace("%%LOCATION%%", location));
+		Dataset ds = DatasetFactory.createGeneral();
+		QC.setFactory(ARQ.getContext(), FacadeX.ExecutorFactory);
+		// XXX This process never ends!
+		Model rs = QueryExecutionFactory.create(query, ds).execConstruct();
+		rs.write(System.err, "TTL");
+	}
+
 }

sparql-anything-it/src/test/resources/issues/a00002-1036.xml

@@ -0,0 +1,93 @@
+<artwork>
+	<acno>A00002</acno>
+	<acquisitionYear>1922</acquisitionYear>
+	<creator>
+		<name>Robert Blake</name>
+		<birthYear>1762</birthYear>
+		<gender>Male</gender>
+		<id>38</id>
+	</creator>
+	<creditLine>Presented by Mrs John Richmond 1992</creditLine>
+	<height>213</height>
+	<id>1036</id>
+	<medium>Graphite on paper</medium>
+	<topics>
+		<children>
+			<children>
+				<children>
+					<item>
+						<id>273</id>
+						<name>comforting</name>
+					</item>
+					<item>
+						<id>544</id>
+						<name>embracing</name>
+					</item>
+					<item>
+						<id>2653</id>
+						<name>recoiling</name>
+					</item>
+				</children>
+				<item>
+					<id>177</id>
+					<name>actions: expressive</name>
+				</item>
+			</children>
+			<children>
+				<children>
+					<item>
+						<id>451</id>
+						<name>figure</name>
+					</item>
+				</children>
+				<item>
+					<id>95</id>
+					<name>adults</name>
+				</item>
+			</children>
+			<children>
+				<children>
+					<item>
+						<id>799</id>
+						<name>group</name>
+					</item>
+				</children>
+				<item>
+					<id>97</id>
+					<name>groups</name>
+				</item>
+			</children>
+			<item>
+				<id>91</id>
+				<name>people</name>
+			</item>
+		</children>
+		<children>
+			<children>
+				<children>
+					<item>
+						<id>2815</id>
+						<name>fear</name>
+					</item>
+				</children>
+				<item>
+					<id>31</id>
+					<name>emotions and human qualities</name>
+				</item>
+			</children>
+			<item>
+				<id>29</id>
+				<name>emotions, concepts and ideas</name>
+			</item>
+		</children>
+		<item>
+			<id>1</id>
+			<name>topicRoot</name>
+		</item>
+	</topics>
+	<title>Two Drawings of Frightened Figures, Probably for 'The Approach of Doom'</title>
+	<units>mm</units>
+	<url>https://www.tate.org.uk/art/artworks/blake-two-drawings-of-frightened-figures-probably-for-the-approach-of-doom-a00002</url>
+	<width>311</width>
+</artwork>
+

sparql-anything-it/src/test/resources/issues/e.sparql

@@ -0,0 +1,24 @@
+PREFIX fx: <http://sparql.xyz/facade-x/ns/>
+PREFIX xyz: <http://sparql.xyz/facade-x/data/>
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX tsub: <http://sparql.xyz/example/tate/topic/>
+PREFIX schema: <http://schema.org/>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+
+CONSTRUCT {
+	?artwork schema:about ?topic .
+	?topic schema:name ?name .
+} WHERE {
+  SERVICE <x-sparql-anything:location=%%LOCATION%%> {
+#	[ a xyz:children; fx:anySlot [a xyz:item; fx:anySlot [ a xyz:id; rdf:_1 ?topicId]; fx:anySlot [ a xyz:name; rdf:_1 ?name ] ] ] .
+#	[ a xyz:children; ?li1 [a xyz:item; ?li2 [ a xyz:id; ?li3 ?topicId]; ?li4 [ a xyz:name; ?li5 ?name ] ] ] .
+	[] a xyz:children; fx:anySlot [a xyz:item; fx:anySlot [ a xyz:id; fx:anySlot ?topicId]; fx:anySlot [ a xyz:name; fx:anySlot ?name ]] .
+#	[] a xyz:children; ?li1 [a xyz:item; ?li2 [ a xyz:id; ?li3 ?topicId]; ?li4 [ a xyz:name; ?li5 ?name ]] .
+	[] a xyz:url; fx:anySlot ?artworkUrl .
+	BIND(IRI(?artworkUrl) as ?artwork) .
+	BIND(IRI(CONCAT(STR(tsub:),STR(?topicId))) AS ?topic) .
+	FILTER (?topicId != xyz:id) .
+	FILTER (?name != xyz:name) .
+	FILTER (?artworkUrl != xyz:url) .
+  }
+}