protected void advanceSubIterator() {
try {
if (mCurrentOffset < mOffsets.size()) {
if (mOffsets.start(mCurrentOffset) != mPreviousVirtualOffsetStart) {
// Diagnostic.developerLog("After region " + mCurrentOffset + " " + mCurrentRegion + ",
// opening new reader at offset " +
// VirtualOffsets.offsetToString(mOffsets.start(mCurrentOffset)) + " for region " +
// mOffsets.region(mCurrentOffset));
mReader.seek(mOffsets.start(mCurrentOffset));
mBuffered = false;
// } else {
// Diagnostic.developerLog("After region " + mCurrentOffset + " " + mCurrentRegion + ",
// re-using existing reader for region " + mOffsets.region(mCurrentOffset));
}
mCurrentRegion = mOffsets.region(mCurrentOffset);
final int newTemplate = mSequenceLookup.get(mCurrentRegion.getSequenceName());
if (newTemplate != mCurrentTemplate) {
mPreviousAlignmentStart = Integer.MIN_VALUE;
}
mPreviousVirtualOffsetStart = mOffsets.start(mCurrentOffset);
mCurrentTemplate = newTemplate;
}
mCurrentOffset++;
} catch (IOException e) {
throw new RuntimeIOException(e.getMessage(), e);
}
}
private void populateNext(boolean force) throws IOException {
final int previousStart = mNextAlignmentStart;
final int previousTemplateId = mNextTemplateId;
mNextRecord = null;
if (force) {
advanceSubIterator();
}
while (mCurrentOffset <= mOffsets.size()) {
if (!mBuffered
&& !mReader
.hasNext()) { // Only happens when stream is exhausted, so effectively just closes
// things out.
advanceSubIterator();
} else {
if (mBuffered) {
mBuffered = false;
} else {
mReader.next();
}
final String refName = mReader.getReferenceName();
final Integer refId =
mSequenceLookup.get(
refName); // Note that we cannot rely on mReader.getReferenceId in this scenario,
// as that is built up incrementally
if (refId == null) {
throw new IOException(
"Tabixed input contained a sequence name not found in the corresponding index: "
+ refName);
}
if (refId
> mCurrentTemplate) { // current offset has exceeded region and block overlapped next
// template
mBuffered = true;
advanceSubIterator();
} else {
if (refId
< mCurrentTemplate) { // Current block may occasionally return records from the
// previous template if the block overlaps
// Diagnostic.developerLog("Ignoring record from earlier template at " +
// mReader.getReferenceName() + ":" + (mReader.getStartPosition() + 1) + " (" + refId
// + "<" + mCurrentTemplate + ")");
continue;
}
final int alignmentStart = mReader.getStartPosition();
final int alignmentEnd = alignmentStart + mReader.getLengthOnReference();
if (alignmentEnd <= mCurrentRegion.getStart()) { // before region
// Diagnostic.developerLog("Ignoring record from earlier than start at " +
// mReader.getReferenceName() + ":" + (mReader.getStartPosition() + 1));
continue;
}
if (alignmentStart
<= mPreviousAlignmentStart) { // this record would have been already returned by an
// earlier region
// Diagnostic.developerLog("Ignoring record from earlier block at " +
// mReader.getReferenceName() + ":" + (alignmentStart + 1));
mDoubleFetched++;
if (mDoubleFetched % 100000 == 0) {
Diagnostic.developerLog(
"Many double-fetched records noticed at "
+ mReader.getReferenceName()
+ ":"
+ (alignmentStart + 1)
+ " in region "
+ mCurrentRegion
+ " (skipping through to "
+ mPreviousAlignmentStart
+ ")");
}
continue;
}
if (alignmentStart
>= mCurrentRegion
.getEnd()) { // past current region, advance the iterator and record the
// furtherest we got
if (previousStart != Integer.MIN_VALUE && previousTemplateId == mCurrentTemplate) {
mPreviousAlignmentStart = previousStart;
} else {
mPreviousAlignmentStart = Integer.MIN_VALUE;
}
mBuffered = true;
advanceSubIterator();
continue;
}
mNextRecord = mReader.getRecord();
mNextTemplateId = mCurrentTemplate;
mNextAlignmentStart = alignmentStart;
break;
}
}
}
}