[jira] [Commented] (JENA-1370) Exponent values

["Andy Seaborne (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-1370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16076324#comment-16076324 ] 

Andy Seaborne commented on JENA-1370:
-------------------------------------

See also JENA-1303.

{{"-1.700000e+00"^^xsd:double}} and {{"-1.7E0"^^xsd:double}} are different RDF terms representing the same value.

{{isIsomorphicWith}} compares by RDF term, not by values.

A related example is a graph 
{noformat}
:s :p -1.700000e+00 .
:s :p -1.7E0 .
{noformat}

has two triples so has a different triple count to 

{noformat}
:s :p -1.7E0 .
{noformat}

There is a general, and slower, matcher in {{IsoMatcher}}. You can take that code and provide {{NodeUtils.sameValue`}}. Unfortunately, the necessary call is private in the current release but the code is open source.  It will be public in 3.4.0.


> Exponent values 
> ----------------
>
>                 Key: JENA-1370
>                 URL: https://issues.apache.org/jira/browse/JENA-1370
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: Jena
>    Affects Versions: Jena 3.2.0
>         Environment: Java 1.8, Ubuntu Linux (xenial)
>            Reporter: Daan Reid
>
> The equality between float values appears to be not working as I expected.
> Example code: 
> {code:java}
>   @Test
>   public void testDeltaSimple() throws Exception {
>     Graph oldGraph = GraphFactory.createGraphMem();
>     Graph newGraph = GraphFactory.createGraphMem();
>     // oldGraph:
>     // <http://example.com/subject> <http://example.com/property> -1.700000e+00 ;
>     // newGraph: 
>     // <http://example.com/subject> <http://example.com/property> -1.7E0 ;
>     RDFDataMgr.read(oldGraph, "oldGraph.ttl");
>     RDFDataMgr.read(newGraph, "newGraph.ttl");
>     Delta delta = new Delta(oldGraph);
>     delta.clear();
>     GraphUtil.addInto(delta, newGraph);
>     if (!delta.isIsomorphicWith(oldGraph)) {
>       System.err.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
>       RDFDataMgr.write(System.err, delta.getAdditions(), Lang.TURTLE);
>       System.err.println("-------------------------------------------------------------------------------------");
>       RDFDataMgr.write(System.err, delta.getDeletions(), Lang.TURTLE);
>       fail("!!!!!!!!!!!!!!!!!!!!!! RDF not equal");
>     }
>   }
> {code}
> Result:
> {noformat}
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> -------------------------------------------------------------------------------------
> <http://example.com/subject>
>         <http://example.com/property>  -1.700000e+00 .
> java.lang.AssertionError: !!!!!!!!!!!!!!!!!!!!!! RDF not equal
> {noformat}
> If I start with an empty graph for oldGraph, the new double value is properly added.



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