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package org.custommonkey.xmlunit.examples;
import org.custommonkey.xmlunit.Difference;
import org.custommonkey.xmlunit.DifferenceListener;
/**
* Expects texts to be floating point numbers and treats them as
* identical if they only differ by a given tolerance value (or less).
*
* <p>This implementation uses an absolute tolerance value value for
* all numbers encountered, calculating a difference relative to one
* of the numbers compared might be more appropriate in general.</p>
*/
public class FloatingPointTolerantDifferenceListener
extends TextDifferenceListenerBase {
private final double tolerance;
public FloatingPointTolerantDifferenceListener(DifferenceListener delegateTo,
double tolerance) {
super(delegateTo);
this.tolerance = tolerance;
}
protected int textualDifference(Difference d) {
String control = d.getControlNodeDetail().getValue();
String test = d.getTestNodeDetail().getValue();
if (control != null && test != null) {
try {
double controlVal = Double.parseDouble(control);
double testVal = Double.parseDouble(test);
return Math.abs(controlVal - testVal) <= tolerance
? DifferenceListener.RETURN_IGNORE_DIFFERENCE_NODES_IDENTICAL
: DifferenceListener.RETURN_ACCEPT_DIFFERENCE;
} catch (NumberFormatException nfe) {
// ignore, delegate to nested DifferenceListener
}
}
// no numbers or null, delegate
return super.textualDifference(d);
}
}