private final IndexReader doOpenFromWriter(boolean openReadOnly, IndexCommit commit)
throws CorruptIndexException, IOException {
assert readOnly;
if (!openReadOnly) {
throw new IllegalArgumentException(
"a reader obtained from IndexWriter.getReader() can only be reopened with openReadOnly=true (got false)");
}
if (commit != null) {
throw new IllegalArgumentException(
"a reader obtained from IndexWriter.getReader() cannot currently accept a commit");
}
if (writer.nrtIsCurrent(segmentInfos)) {
return null;
}
IndexReader reader = writer.getReader(applyAllDeletes);
// If in fact no changes took place, return null:
if (reader.getVersion() == segmentInfos.getVersion()) {
reader.decRef();
return null;
}
reader.readerFinishedListeners = readerFinishedListeners;
return reader;
}
