Issue #64 - Add Closure/Consumer support

Author: boretti

src/main/java/ch/powerunit/extensions/exceptions/CommonsCollections4Helper.java

@@ -22,9 +22,11 @@
 import static ch.powerunit.extensions.exceptions.Constants.verifySupplier;
 import static ch.powerunit.extensions.exceptions.Constants.verifyPredicate;
 import static ch.powerunit.extensions.exceptions.Constants.verifyFunction;
+import static ch.powerunit.extensions.exceptions.Constants.verifyConsumer;
 
 import java.util.function.Function;
 
+import org.apache.commons.collections4.Closure;
 import org.apache.commons.collections4.Factory;
 import org.apache.commons.collections4.FunctorException;
 import org.apache.commons.collections4.Transformer;
@@ -116,4 +118,26 @@ public static <T> Factory<T> asFactory(SupplierWithException<T, ?> supplier) {
 	public static <I, O> Transformer<I, O> asTransformer(FunctionWithException<I, O, ?> function) {
 		return FunctionWithException.unchecked(verifyFunction(function), DEFAULT_EXCEPTION_MAPPER)::apply;
 	}
+
+	/**
+	 * Transforms a {@link ConsumerWithException} to the one from
+	 * commons-collections.
+	 * 
+	 * @param consumer
+	 *            the {@link ConsumerWithException} to be transformed to the one
+	 *            from commons-collections.
+	 * @param <T>
+	 *            the type of the input argument for the consumer
+	 * @return the {@link Closure closure} from commons-collections. The
+	 *         ClassCastException and IllegalArgumentException are not wrapped and
+	 *         the other exception are wrapped in a FunctorException.
+	 * @throws NoClassDefFoundError
+	 *             In case the commons-collections4 library is not available.
+	 * @throws NullPointerException
+	 *             if consumer is null.
+	 * @see org.apache.commons.collections4.Predicate
+	 */
+	public static <T> Closure<T> asClosure(ConsumerWithException<T, ?> consumer) {
+		return ConsumerWithException.unchecked(verifyConsumer(consumer), DEFAULT_EXCEPTION_MAPPER)::accept;
+	}
 }

src/test/java/ch/powerunit/extensions/exceptions/CommonsCollections4HelperTest.java

@@ -92,4 +92,31 @@ public void testAsTransformerOtherException() {
 				.transform("x")).throwException(instanceOf(FunctorException.class));
 	}
 
+	// AsClosure
+
+	@Test
+	public void testAsClosureNoException() {
+		CommonsCollections4Helper.asClosure(x -> {
+		}).execute("x");
+	}
+
+	@Test
+	public void testAsClosureClassCastException() {
+		assertWhen((x) -> CommonsCollections4Helper.asClosure(ConsumerWithException.failing(ClassCastException::new))
+				.execute("x")).throwException(instanceOf(ClassCastException.class));
+	}
+
+	@Test
+	public void testAsClosureIllegalArgumentException() {
+		assertWhen((x) -> CommonsCollections4Helper
+				.asClosure(ConsumerWithException.failing(IllegalArgumentException::new)).execute("x"))
+						.throwException(instanceOf(IllegalArgumentException.class));
+	}
+
+	@Test
+	public void testAsClosureOtherException() {
+		assertWhen((x) -> CommonsCollections4Helper.asClosure(ConsumerWithException.failing(RuntimeException::new))
+				.execute("x")).throwException(instanceOf(FunctorException.class));
+	}
+
 }