Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/237#discussion_r116378420
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/expr/nodevalue/NodeValueSortKey.java
---
@@ -0,0 +1,91 @@
+/*
+ * 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.sparql.expr.nodevalue;
+
+import org.apache.jena.graph.Node;
+import org.apache.jena.graph.NodeFactory;
+import org.apache.jena.sparql.expr.NodeValue;
+import org.apache.jena.sparql.util.FmtUtils;
+
+/**
+ * A {@link NodeValue} that supports collation value for a string. This
allows query values
+ * to be sorted following rules for a specific collation.
+ */
+public class NodeValueSortKey extends NodeValue {
+
+ /**
+ * Node value text.
+ */
+ private final String string;
+ /**
+ * Node value collation language tag (e.g. fi, pt-BR, en, en-CA, etc).
+ */
+ private final String collation;
+
+ public NodeValueSortKey(final String string, final String collation) {
+ this.string = string;
+ this.collation = collation;
+ }
+
+ public NodeValueSortKey(final String string, final String collation,
Node n) {
+ super(n);
+ this.string = string;
+ this.collation = collation;
+ }
+
+ @Override
+ public boolean isSortKey() {
+ return Boolean.TRUE;
+ }
+
+ @Override
+ public String getString() {
+ return string;
+ }
+
+ @Override
+ public String asString() {
+ return string;
+ }
+
+ @Override
+ public String getCollation() {
+ return collation;
+ }
+
+ @Override
+ protected Node makeNode() {
+ return NodeFactory.createLiteral(string);
+ }
+
--- End diff --
@kinow, I like the idea of making that sort of contract more specifically
visible in the type system. You are distinguishing the two case @afs mentioned
by putting `getString`, `getInteger`, etc. into the generic and leaving
"control" functions like `getCollation` out of it?
Wouldn't this be just as much a good pattern for `NodeValue` itself, except
we would have to be careful about migrating it?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
