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https://issues.apache.org/jira/browse/JENA-1841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17049652#comment-17049652
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Claude Warren commented on JENA-1841:
-------------------------------------
When creating a Node from an Object the QueryBuilder code does the following:
convert _null_ to `Node.ANY`
if object instance of `FrontsNode` check if var and return `Var.alloc( node )`
or node if not var.
if object instance of `Node` check if var and return `Var.alloc( node )` or
node if not var.
if object instance of String call `NodeFactoryExtra.parseNode( string,
prefixmap )` then check for var as above. If this throws a RiotException
ignore it and attempt the next conversion
all other cases, call `NodeFactory.createLiteral(
LiteralLabelFactory.createTypedLiteral( object ) )`.
So in the case of a UUID object it will call
`LiteralLabelFactory.createTypedLiteral( uuid )` which will eventually call
`TypeMapper.getTypeByValue( uuid )`. If that returns null it will "invent a
datatype", otherwise it will use the RDFDatatype.
In the ExprFactory `eq( object, object )` does the following conversions:
if object is null return `Expr.NONE`
if object is instance of `Expr` return `(Expr)object`
otherwise convert to `Node` using above process. If node is Var return
`ExprVar( Var )` otherwise call `NodeValue.makeNode( node )`.
Given the `eq( "?uuid", uuid )` the toNodeValue will be passed the literal node
as created by `LiteralLabelFactory.createTypedLiteral( uuid )`
So if `NodeValue.nodeToValue( NodeFactory.createLiteral(
LiteralLabelFactory.createTypedLiteral( uuid ) ) )` returns what you are
expecting the query builder will work.
Andy's solution of registering a new type should work as expected.
> Side Effect of Datatype <java:java.util.UUID> Use in Query
> ----------------------------------------------------------
>
> Key: JENA-1841
> URL: https://issues.apache.org/jira/browse/JENA-1841
> Project: Apache Jena
> Issue Type: Bug
> Affects Versions: Jena 3.14.0
> Reporter: Jan Martin Keil
> Priority: Major
>
> I faced a bug caused by a side effect of using the datatype
> <java:java.util.UUID> in a query.
> Short story is that you can not use this datatype in model parsing or queries
> after you once used it in a query.
> I did not completely break it down to a specific peace of code, but I wrote
> some testcases that narrow down the issue. Please note that the order of
> execution of the test methods effect the result. So please first try to
> execute single test methods before executing the whole test class.
> {code:java}
> import java.io.ByteArrayInputStream;
> import java.util.UUID;
> import org.apache.jena.arq.querybuilder.SelectBuilder;
> import org.apache.jena.query.QueryExecution;
> import org.apache.jena.query.QueryExecutionFactory;
> import org.apache.jena.rdf.model.Model;
> import org.apache.jena.rdf.model.ModelFactory;
> import org.junit.jupiter.api.Test;
> public class UuidParsingintoModelOrQuery {
> @Test
> public void uuidParsingIntoSingleModel() throws Exception {
> UUID uuid1 =
> UUID.fromString("00000000-0000-0000-0000-000000000000");
> UUID uuid2 =
> UUID.fromString("00000000-0000-0000-0000-000000000001");
> String modelStr = "_:a <http://example.org/p1> \"" + uuid1 +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid1 +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> // repeat
> modelStr = "_:a <http://example.org/p1> \"" + uuid2 +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid2 +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> }
> @Test
> public void sameUuidParsingIntoSingleModel() throws Exception {
> UUID uuid1 =
> UUID.fromString("00000000-0000-0000-0000-000000000002");
> UUID uuid2 =
> UUID.fromString("00000000-0000-0000-0000-000000000003");
> String modelStr = "_:a <http://example.org/p1> \"" + uuid1 +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid2 +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> // repeat
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> }
> @Test
> public void sameUuidParsingIntoMultipleModel() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000004");
> String modelStr = "_:a <http://example.org/p1> \"" + uuid +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> }
> @Test
> public void uuidUseInQuery() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000005");
> SelectBuilder select = new SelectBuilder();
> select.addWhere("?a", "<http://example.org/p>", "?uuid");
> select.addFilter(select.getExprFactory().eq("?uuid", uuid));
> QueryExecution q = QueryExecutionFactory.create(select.build());
> }
> @Test
> public void uuidParsingIntoQuery() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000006");
> SelectBuilder select = new SelectBuilder();
> select.addWhere("?a", "<http://example.org/p>", "?uuid");
> select.addFilter(select.getExprFactory().eq("?uuid", uuid));
> QueryExecution q =
> QueryExecutionFactory.create(select.toString());
> }
> @Test
> public void uuidUseInQueryAndParsingIntoModel() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000007");
> SelectBuilder select = new SelectBuilder();
> select.addWhere("?a", "<http://example.org/p>", "?uuid");
> select.addFilter(select.getExprFactory().eq("?uuid", uuid));
> QueryExecution q = QueryExecutionFactory.create(select.build());
> String modelStr = "_:a <http://example.org/p1> \"" + uuid +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid +
> "\"^^<java:java.util.UUID> .";
> Model model = ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "",
> "N-TRIPLE");
> }
> }
> {code}
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