Merge pull request #1 from eclipse/prelim-approved-contrib

merge latest updates from master branch

Author: abrokenjester

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

@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, 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.Optional;
+
+import org.eclipse.rdf4j.model.IRI;
+import org.eclipse.rdf4j.model.Resource;
+import org.eclipse.rdf4j.model.Statement;
+import org.eclipse.rdf4j.model.Value;
+
+/**
+ * Either supplies a statement matching the given pattern, or
+ * {@link Optional#empty()} otherwise.
+ * 
+ * @author Peter Ansell
+ */
+@FunctionalInterface
+public interface GetStatementOptional {
+
+	/**
+	 * Either supplies a statement matching the given pattern, or
+	 * {@link Optional#empty()} otherwise.
+	 * 
+	 * @param subject
+	 *            A {@link Resource} to be used to match to statements.
+	 * @param predicate
+	 *            An {@link IRI} to be used to match to statements.
+	 * @param object
+	 *            A {@link Value} to be used to match to statements.
+	 * @param contexts
+	 *            An array of context {@link Resource} objects, or left out (not
+	 *            null) to select from all contexts.
+	 * @return An {@link Optional} either containing a single statement matching
+	 *         the pattern or {@link Optional#empty()} otherwise.
+	 */
+	Optional<Statement> get(Resource subject, IRI predicate, Value object, Resource... contexts);
+
+}

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

@@ -7,7 +7,7 @@
  *******************************************************************************/
 package org.eclipse.rdf4j.model.util;
 
-import org.eclipse.rdf4j.model.Model;
+import org.eclipse.rdf4j.OpenRDFException;
 import org.eclipse.rdf4j.model.Value;
 
 /**
@@ -16,7 +16,7 @@
  * 
  * @author Arjohn Kampman
  */
-public class ModelException extends RuntimeException {
+public class ModelException extends OpenRDFException {
 
 	private static final long serialVersionUID = 3886967415616842867L;
 

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

@@ -15,7 +15,7 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
-import java.util.stream.Stream;
+import java.util.function.Supplier;
 
 import org.eclipse.rdf4j.model.BNode;
 import org.eclipse.rdf4j.model.IRI;
@@ -79,7 +79,8 @@ public static Value anyObject(Model m) {
 	 * @since 4.0
 	 */
 	public static Optional<Literal> objectLiteral(Model m) {
-		return m.stream().map(st -> st.getObject()).filter(o -> o instanceof Literal).map(l -> (Literal)l).findAny();
+		return m.stream().map(st -> st.getObject()).filter(o -> o instanceof Literal).map(
+				l -> (Literal)l).findAny();
 	}
 
 	/**
@@ -103,7 +104,8 @@ public static Literal anyObjectLiteral(Model m) {
 	 * @since 4.0
 	 */
 	public static Optional<Resource> objectResource(Model m) {
-		return m.stream().map(st -> st.getObject()).filter(o -> o instanceof Resource).map(r -> (Resource)r).findAny();
+		return m.stream().map(st -> st.getObject()).filter(o -> o instanceof Resource).map(
+				r -> (Resource)r).findAny();
 	}
 
 	/**
@@ -128,16 +130,17 @@ public static Resource anyObjectResource(Model m) {
 	public static Optional<IRI> objectIRI(Model m) {
 		return m.stream().map(st -> st.getObject()).filter(o -> o instanceof IRI).map(r -> (IRI)r).findAny();
 	}
-	
+
 	/**
 	 * Retrieves an object value as a String from the statements in the given
-	 * model. If more than one possible object value exists, any one value is picked
-	 * and returned. 
+	 * model. If more than one possible object value exists, any one value is
+	 * picked and returned.
 	 * 
 	 * @param m
 	 *        the model from which to retrieve an object String value.
-	 * @return an {@link Optional} object String value from the given model, which
-	 *         will be {@link Optional#empty() empty} if no such value exists.
+	 * @return an {@link Optional} object String value from the given model,
+	 *         which will be {@link Optional#empty() empty} if no such value
+	 *         exists.
 	 * @since 4.0
 	 */
 	public static Optional<String> objectString(Model m) {
@@ -210,7 +213,8 @@ public static URI anySubjectURI(Model m) {
 	 * @since 4.0
 	 */
 	public static Optional<BNode> subjectBNode(Model m) {
-		return m.stream().map(st -> st.getSubject()).filter(s -> s instanceof BNode).map(s -> (BNode)s).findAny();
+		return m.stream().map(st -> st.getSubject()).filter(s -> s instanceof BNode).map(
+				s -> (BNode)s).findAny();
 	}
 
 	/**
@@ -573,4 +577,18 @@ private static <S extends Statement> Set<S> toSet(Iterable<S> iterable) {
 		}
 		return set;
 	}
+
+	/**
+	 * Creates a {@link Supplier} of {@link ModelException} objects that be
+	 * passed to {@link Optional#orElseThrow(Supplier)} to generate exceptions as
+	 * necessary.
+	 * 
+	 * @param message
+	 *        The message to be used for the exception
+	 * @return A {@link Supplier} that will create {@link ModelException} objects
+	 *         with the given message.
+	 */
+	public static Supplier<ModelException> modelException(String message) {
+		return () -> new ModelException(message);
+	}
 }