@Override
public boolean hasNext() {
try {
return !buffer.isEmpty()
|| iterator.hasNext()
|| (currentReader != null && currentReader.ready());
} catch (IOException e) {
// this exception is possible only at currentReader.ready(), so it means that it's definitely
// NOT ready
return false;
}
}
@Override
public String nextSentence() {
if (buffer.size() < linesToFetch) {
// prefetch
if (currentReader != null) {
fetchLines(linesToFetch);
} else if (this.iterator.hasNext()) {
currentReader = new BufferedReader(new InputStreamReader(iterator.nextDocument()));
fetchLines(linesToFetch);
}
}
// actually its the same. You get string or you get null as result of poll, if buffer is empty
// after prefetch try
if (buffer.size() < 1) return null;
else return buffer.poll();
}
@Override
public void reset() {
iterator.reset();
}