Merge pull request #868 from Fedict/issues/#440-vocabutil

Issues/#440 vocabutil

Author: James Leigh

core/model/src/main/java/org/eclipse/rdf4j/model/util/Vocabularies.java

@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 2017 Eclipse RDF4J contributors, and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Distribution License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ */
+package org.eclipse.rdf4j.model.util;
+
+import java.lang.reflect.Field;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.eclipse.rdf4j.model.IRI;
+
+/**
+ * Utility functions for working with vocabularies.
+ * 
+ * @author Bart Hanssens
+ */
+public class Vocabularies {
+	/**
+	 * Get all the {@link IRI IRIs} of the classes and properties of a vocabulary.
+	 *
+	 * @param vocabulary RDF vocabulary
+	 * @return set of IRIs
+	 */
+	public static Set<IRI> getIRIs(Class vocabulary) {
+		Set<IRI> iris = new LinkedHashSet<>();
+
+		for (Field f : vocabulary.getFields()) {
+			if (f.getType().equals(IRI.class)) {
+				try {
+					iris.add((IRI) f.get(vocabulary));
+				} catch (IllegalAccessException ex) {
+					// should not happen
+					throw new RuntimeException("Cannot access vocabulary field", ex);
+				}
+			}
+		}
+		return iris;
+	}
+}

core/model/src/test/java/org/eclipse/rdf4j/model/util/VocabulariesTest.java

@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) 2017 Eclipse RDF4J contributors, and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Distribution License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ */
+package org.eclipse.rdf4j.model.util;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.rdf4j.model.IRI;
+import org.eclipse.rdf4j.model.vocabulary.DC;
+
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author Bart Hanssens
+ */
+public class VocabulariesTest {
+
+	@Test
+	public void testVocabAllIRI() throws Exception {
+		Set<IRI> dcIRIs = new HashSet<>(Arrays.asList(
+			DC.CONTRIBUTOR, DC.COVERAGE, DC.CREATOR, DC.DATE, DC.DESCRIPTION,
+			DC.FORMAT, DC.IDENTIFIER, DC.LANGUAGE, DC.PUBLISHER, DC.RELATION,
+			DC.RIGHTS, DC.SOURCE, DC.SUBJECT, DC.TITLE, DC.TYPE));
+
+		Set<IRI> allIRIs = Vocabularies.getIRIs(DC.class);
+
+		assertEquals(dcIRIs, allIRIs);
+	}
+}