[ xmlunit-Feature Requests-1762410 ] use tolerance for floating point values in XML

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Feature Requests item #1762410, was opened at 2007-07-27 16:55
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Ken Estes (kestesisme)
Assigned to: Nobody/Anonymous (nobody)
Summary: use tolerance for floating point values in XML

Initial Comment:
We produce XML which has numerical values scattered through out the
XML both in nodes and attributes.

    <svg xmlns="http://www.w3.org/2000/svg" width="0.085in" height="0.085in">
    <text text-anchor="end" y="92" x="15">36</text>
    <fo:block-container height="2pc" width="46.5pc" left="2.5pc" top="64pc">

The numerical values can be produced by computations which are carried
out in software or hardware.  Because of round off errors we need to
have a custom string equals function which will allow for round off in
the numeric portions of the string.


Enclosed please find a file which will perform such numeric comparisons.


Here is my suggestion for how to hook it into XMLUnit.


    /**
     * Test two non-null values for inequality
     * @param expected
     * @param actual
     * @return TRUE if the values are not equals() equal (taking whitespace
     *  into account if necessary)
     */
    private boolean unequalNotNull(Object expected, Object actual) {
        boolean bothStrings = (expected instanceof String
                               && actual instanceof String);
        if (!bothStrings) {
            return !(expected.equals(actual));
        }

        String expectedString = (String) expected;
        String actualString = (String) actual;

        if (XMLUnit.getIgnoreWhitespace()) {
            expectedString = expected.trim();
            actualString = actual.trim();
        }
        if (XMLUnit.getNormalizeWhitespace()) {
            expectedString = normalizeWhitespace(expectedString);
            actualString = normalizeWhitespace(actualString);
        }

        if (XMLUnit.getTolerantNumericCompare) {
            return !StringCmpNumericTolerance.equals(expected,actualString);
        }
        return !expectedString.equals(actualString);
    }


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