if (handler == null)
throw new IllegalArgumentException("Null handler");
if (visitor == null)
throw new IllegalArgumentException("Null visitor");
VisitorAttributes attributes = visitor.getAttributes();
boolean includeRoot = attributes.isIncludeRoot();
boolean leavesOnly = attributes.isLeavesOnly();
boolean ignoreErrors = attributes.isIgnoreErrors();
boolean includeHidden = attributes.isIncludeHidden();
VirtualFileFilter recurseFilter = attributes.getRecurseFilter();
visit(handler, visitor, includeRoot, leavesOnly, ignoreErrors,
includeHidden, recurseFilter);
}