SVNAssert.assertTrue(lowerBound >= 0.0 && lowerBound <= upperBound && upperBound <= 1.0);
SVNAssert.assertTrue(currentIndex >= 0); SVNAssert.assertTrue(currentIndex < indexCount);
	public static ISVNProgressViewer createInstance(ISVNProgressViewer parentProgressViewer, double lowerBound, double upperBound) {		SVNAssert.assertNotNull(parentProgressViewer);		SVNAssert.assertTrue(lowerBound >= 0.0 && lowerBound <= upperBound && upperBound <= 1.0);		return new SVNProgressRangeViewer(parentProgressViewer, lowerBound, upperBound);	}