if (sortedStreams.size() == 0)
return false;
TokenStream currentTokenStream = sortedStreams.pop();
restoreState(currentTokenStream.captureState());
OffsetAttribute offsetAttr = (OffsetAttribute)currentTokenStream.getAttribute(OffsetAttribute.class);
if (offsetAttr.startOffset() == currentOffset)
posIncAtt.setPositionIncrement(0);
else