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

[Daan Reid (JIRA)]

Daan Reid created JENA-1370:
-------------------------------

             Summary: 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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