Simplified from interface NamedValueSource.

Changed the return value of `setNamedValueReceiver` in
`NamedValueSource` to void because it was not used anywhere.
Consequently, the type of the method parameter does no longer need to be
a generic and is changed to `NameValueReceiver`.

Author: cboehme

src/main/java/org/culturegraph/mf/morph/AbstractNamedValuePipe.java

@@ -21,7 +21,7 @@
  * Base class for {@link NamedValuePipe}s.
  *
  * @author Markus Michael Geipel
- * @author Chistohp Böhme
+ * @author Chistoph Böhme
  *
  */
 public abstract class AbstractNamedValuePipe implements NamedValuePipe {
@@ -31,12 +31,8 @@ public abstract class AbstractNamedValuePipe implements NamedValuePipe {
 	private Location sourceLocation;
 
 	@Override
-	public final <R extends NamedValueReceiver> R setNamedValueReceiver(
-			final R receiver) {
-
+	public final void setNamedValueReceiver(final NamedValueReceiver receiver) {
 		namedValueReceiver = receiver;
-
-		return receiver;
 	}
 
 	@Override

src/main/java/org/culturegraph/mf/morph/Metamorph.java

@@ -343,7 +343,7 @@ public void addNamedValueSource(final NamedValueSource namedValueSource) {
 	}
 
 	@Override
-	public <R extends NamedValueReceiver> R setNamedValueReceiver(final R receiver) {
+	public void setNamedValueReceiver(final NamedValueReceiver receiver) {
 		throw new UnsupportedOperationException("The Metamorph object cannot act as a NamedValueSender");
 	}
 

src/main/java/org/culturegraph/mf/morph/NamedValueSource.java

@@ -33,8 +33,7 @@ public interface NamedValueSource extends KnowsSourceLocation {
 	 * {@link NamedValueReceiver.addNamedValueSource}.
 	 *
 	 * @param receiver
-	 * @return reference to receiver
 	 */
-	<R extends NamedValueReceiver> R setNamedValueReceiver(R receiver);
+	void setNamedValueReceiver(NamedValueReceiver receiver);
 
 }