[JXPATH-93] Binary operators behaviour involving node-sets is incorrect

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2 Final
• Fix Version/s: 1.3

Environment

1.2, SVN version

• Assignee: Unassigned
• Reporter: Sergey Vladimirov
• Created: 09/Jul/07 11:18
• Updated: 13/Jul/07 19:56
• Resolved: 13/Jul/07 19:56

Description

According to XPath specification:
"If both objects to be compared are node-sets, then the comparison will be true if and only if there is a node in the first node-set and a node in the second node-set such that the result of performing the comparison on the string-values of the two nodes is true. If one object to be compared is a node-set and the other is a number, then the comparison will be true if and only if there is a node in the node-set such that the result of performing the comparison on the number to be compared and on the result of converting the string-value of that node to a number using the number function is true."

But following example illustrates, that this is not a JXPath behaviour:

JXPathContext pathContext = JXPathContext
.newContext(DocumentBuilderFactory.newInstance()
.newDocumentBuilder().parse(
new InputSource(new StringReader(
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n"
+ "<doc/>"))));
Boolean result = (Boolean) pathContext.getValue("2.0 > child1",
Boolean.class);
assertFalse(result.booleanValue());

"child1" is not found - right operand node set is empty, but result is TRUE, instead of FALSE.

Please, check greaterThan(), lesserThan(), etc methods of org.apache.xpath.objects.XObject for possible solution