[
https://issues.apache.org/jira/browse/JENA-1107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15074129#comment-15074129
]
ASF GitHub Bot commented on JENA-1107:
--------------------------------------
Github user afs commented on a diff in the pull request:
https://github.com/apache/jena/pull/115#discussion_r48558360
--- Diff:
jena-base/src/main/java/org/apache/jena/atlas/lib/tuple/Tuple.java ---
@@ -0,0 +1,73 @@
+/*
+ * 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.List ;
+import java.util.function.Consumer ;
+import java.util.stream.Stream ;
+
+import org.apache.jena.atlas.lib.ArrayUtils ;
+
+/** A Tuple is the same class of item */
+public interface Tuple<X> extends Iterable<X> {
+ /** Get the i'th element, for i in the range 0 to len()-1
+ * @throws IndexOutOfBoundsException for i out of range
+ */
+ public X get(int i) ;
+
+ /** length : elements are 0 to len()-1 */
+ public int len() ;
+
+ /** Convert to a List */
+ public default List<X> asList() {
+ return new TupleList<>(this) ;
+ }
+
+ /** stream */
+ public default Stream<X> stream() {
+ return asList().stream() ;
+ }
+
+ /** forEach */
+ @Override
+ public default void forEach(Consumer<? super X> action) {
+ asList().forEach(action) ;
+ }
+
+ /** Copy the Tuple into the array */
+ public default void copyInto(X[] array) {
+ copyInto(array, 0, len());
+ }
+
+ /** Copy the Tuple into the array */
+ public default void copyInto(X[] array, int start) {
+ copyInto(array, start, len());
+ }
+
+ /** Copy the Tuple into the array */
+ public void copyInto(X[] array, int start, int length) ;
--- End diff --
I can move that (and iterator()) into the interface.
(Now TupleBase is needed (because you can't default methods from Object in
an interface) some of all can go there if it keeps the source clean.)
> Improve jena-base lib.Tuple
> ---------------------------
>
> Key: JENA-1107
> URL: https://issues.apache.org/jira/browse/JENA-1107
> Project: Apache Jena
> Issue Type: Improvement
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Priority: Minor
>
> Tuples, which are immutable, value-equality fixed length sequences of
> instances of the same type, accessed by index.
> They are like {{T[]}} but immutable, with .equals based on contents, and
> could be improved to work independently of their original use in TDB.
> Proposal:
> # Make Tuple an interface (simpler than current), with special
> implementations for low number of elements.
> # {{ColumnMap}} ==> {{TupleMap}} and sort out the naming as much as possible
> to use as a way to manage index mapping, not just rewriting Tuples.
> An intermediate step is to move {{ColumnMap}} into TDB.
> This is not a proposal to add it to {{Triple}} or {{Quad}}.
> {{Triple}} is not the same as a 3-length {{Tuple<Node>}}. Triple elements
> are accessed by name ({{getSubject}} etc), not index. SPO is just one
> possible order in which to think about triples but it has no special status.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
