[UIMA-5067] JCasUtil.selectSingleRelative returns wrong object

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0uimaFIT
• Fix Version/s: 2.3.0uimaFIT
• Component/s: uimaFIT
• Assignee: Richard Eckart de Castilho
• Reporter: Asher Stern
• Created: 23/Aug/16 09:34
• Updated: 17/Mar/17 17:50
• Resolved: 17/Mar/17 17:50

Description

The returned object of JCasUtil.selectSingleRelative() should match the generic-type of its first argument.
However, when the last argument is 0, it returns an object whose class is identical to the second argument's class.

for (Annotation aa : cas.getAnnotationIndex(AA.type))
{
   Object ab = JCasUtil.selectSingleRelative(AB.class, aa, 0);
   System.out.println(ab.getClass().getName());
}

The output ought to be "AB", however it is "AA".

(When the last argument is 0, I thought it would find an annotation which begins exactly where the annotation of the second argument begins. However, it returns a wrong object).

Perhaps, if last-argument 0 is prohibited, an exception should be thrown (and documented).

Thanks.