Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/120#discussion_r49275522
--- Diff:
jena-base/src/main/java/org/apache/jena/atlas/lib/tuple/QuadConsumer.java ---
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.jena.atlas.lib.tuple;
+
+import java.util.function.Consumer;
+
+/**
+ * Represents an operation that accepts four input arguments and returns
no result. This is a four-arity specialization
+ * of {@link Consumer}. Unlike most other functional interfaces, {@code
QuadConsumer} is expected to operate via
+ * side-effects.
+ * <p>
+ * This is a functional interface whose functional method is {@link
#accept}.
+ *
+ * @param <W> the type of the first argument to the operation
+ * @param <X> the type of the second argument to the operation
+ * @param <Y> the type of the third argument to the operation
+ * @param <Z> the type of the fourth argument to the operation
+ * @see Consumer
+ */
+@FunctionalInterface
+public interface QuadConsumer<W, X, Y, Z> {
+
+ void accept(final W w, final X x, final Y y, final Z z);
+
+ /**
+ * A specialization of {@link QuadConsumer} in which all arguments are
of the same type.
+ *
--- End diff --
Where would you suggest that these new types go? (Perhaps another package
in `jena-base`?) If they are not in this package, does that not vitiate your
second point (about top-level vs. enclosed)? For a name, how about
`TetraFunction` and `TetraOperator`?
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