rvesse opened a new pull request, #3274:
URL: https://github.com/apache/jena/pull/3274
This commit adds the ability for `ParameterizedSparqlString` to support
injecting the `UNDEF` keyword into `VALUES` clauses as needed. A new `undef()`
method is added to the class that provides access to a special instance level
constant `RDFNode` that is used to indicate that the caller wants to inject
`UNDEF`.
Under the hood this is just a wrapper around a `Node` constant but due to
the `setValues()`/`setRowValues()` part of the API working in `RDFNode`'s
rather than `Node`'s went with this approach. I considered refactoring further
to allow that part of the API to take `Node` and `RDFNode` interchangeably
**but** given the limitations of Java type erasure generics (several of the
methods in that part of the API use `Collection<? extends RDFNode>` and
similar) that would effectively introduce a breaking API change so probably
best done for a major release in a separate PR.
GitHub issue resolved #3268
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- [x] Tests are included.
- [ ] Documentation change and updates are provided for the [Apache Jena
website](https://github.com/apache/jena-site/)
- [x] Commits have been squashed to remove intermediate development commit
messages.
- [x] Key commit messages start with the issue number (GH-xxxx)
By submitting this pull request, I acknowledge that I am making a
contribution to the Apache Software Foundation under the terms and conditions
of the [Contributor's
Agreement](https://www.apache.org/licenses/contributor-agreements.html).
----
See the [Apache Jena "Contributing"
guide](https://github.com/apache/jena/blob/main/CONTRIBUTING.md).
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