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VCF_CSI_index_implementation #1684

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VCF_CSI_index_implementation #1684

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17 changes: 15 additions & 2 deletions src/main/java/htsjdk/tribble/AbstractFeatureReader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -225,9 +225,22 @@ static class EmptyIterator<T extends Feature> implements CloseableTribbleIterato

public static boolean isTabix(String resourcePath, String indexPath) throws IOException {
if(indexPath == null){
indexPath = ParsingUtils.appendToPath(resourcePath, FileExtensions.TABIX_INDEX);
String tempTbiIndexPath = ParsingUtils.appendToPath(resourcePath, FileExtensions.TABIX_INDEX);
String tempCsiIndexPath = ParsingUtils.appendToPath(resourcePath, FileExtensions.CSI);
if(IOUtil.hasBlockCompressedExtension(resourcePath)){
if(ParsingUtils.resourceExists(tempTbiIndexPath)){
indexPath = tempTbiIndexPath;
return true;
}
else if(ParsingUtils.resourceExists(tempCsiIndexPath)){
indexPath = tempCsiIndexPath;
return true;
}
else return false;
}
else return false;
}
return IOUtil.hasBlockCompressedExtension(resourcePath) && ParsingUtils.resourceExists(indexPath);
else return IOUtil.hasBlockCompressedExtension(resourcePath) && ParsingUtils.resourceExists(indexPath);
}

public static class ComponentMethods{
Expand Down
120 changes: 101 additions & 19 deletions src/main/java/htsjdk/tribble/readers/TabixReader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,22 +35,26 @@
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.SeekableByteChannel;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.*;
import java.util.function.Function;

/**
* @author Heng Li <[email protected]>
*/
public class TabixReader implements AutoCloseable {
private final String mFilePath;
private final String mIndexPath;
private String mIndexPath;
private final Function<SeekableByteChannel, SeekableByteChannel> mIndexWrapper;
private final BlockCompressedInputStream mFp;

private int min_shift;

private int depth;

private int l_aux;

private int maxBins;

private int mPreset;
private int mSc;
private int mBc;
Expand All @@ -62,12 +66,16 @@ public class TabixReader implements AutoCloseable {

private Map<String, Integer> mChr2tid;

private static final byte[] CSI_MAGIC = {'C','S','I',1};

private static int MAX_BIN = 37450;
//private static int TAD_MIN_CHUNK_GAP = 32768; (not used)
private static int TAD_LIDX_SHIFT = 14;
/** default buffer size for <code>readLine()</code> */
private static final int DEFAULT_BUFFER_SIZE = 1000;

private boolean isCsiIndex = false;

protected static class TPair64 implements Comparable<TPair64> {
long u, v;

Expand Down Expand Up @@ -157,8 +165,14 @@ public TabixReader(final String filePath, final String indexPath, SeekableStream
mFilePath = filePath;
mFp = new BlockCompressedInputStream(stream);
mIndexWrapper = indexWrapper;
if(indexPath == null){
mIndexPath = ParsingUtils.appendToPath(filePath, FileExtensions.TABIX_INDEX);
if(indexPath == null) {
String tempTbiIndexPath = ParsingUtils.appendToPath(filePath, FileExtensions.TABIX_INDEX);
String tempCsiIndexPath = ParsingUtils.appendToPath(filePath, FileExtensions.CSI);
if (ParsingUtils.resourceExists(tempTbiIndexPath)) {
mIndexPath = tempTbiIndexPath;
} else if (ParsingUtils.resourceExists(tempCsiIndexPath)) {
mIndexPath = tempCsiIndexPath;
}
} else {
mIndexPath = indexPath;
}
Expand All @@ -185,6 +199,25 @@ private static int reg2bins(final int beg, final int _end, final int[] list) {
return i;
}


/** regions to bins for CSI index. */
private static int reg2bins(long startPos, long endPos, int min_shift, int depth, int[] bins)
{
final long maxPos = (1L << (min_shift + 3 * depth)) - 1;
final long start = (startPos <= 0) ? 0 : ((long) startPos - 1L) & maxPos;
final long end = (endPos <= 0) ? maxPos : ((long) endPos - 1L) & maxPos;
if (start > end) {
return -1;
}

int l, t, n, s = min_shift + depth*3;
for (t = l = n = 0; l <= depth; s -= 3, t += 1<<l*3, ++l) {
int b = t + (int)(start>>s), e = t + (int)(end>>s), i;
for (i = b; i <= e; ++i) bins[n++] = i;
}
return n;
}

public static int readInt(final InputStream is) throws IOException {
byte[] buf = new byte[4];
is.read(buf);
Expand Down Expand Up @@ -231,18 +264,47 @@ private void readIndex(final SeekableStream fp) throws IOException {
byte[] buf = new byte[4];

is.read(buf, 0, 4); // read "TBI\1"
mSeq = new String[readInt(is)]; // # sequences
mChr2tid = new HashMap<String, Integer>( this.mSeq.length );

if(Arrays.equals(buf, CSI_MAGIC))
isCsiIndex = true;

if(isCsiIndex)
{
min_shift = readInt(is);
depth = readInt(is);
l_aux = readInt(is);
}
if(!isCsiIndex) {
mSeq = new String[readInt(is)]; // # sequences
}
mPreset = readInt(is);
mSc = readInt(is);
mBc = readInt(is);
mEc = readInt(is);
mMeta = readInt(is);
readInt(is);//unused
int l_nm = readInt(is);

if(isCsiIndex)
{
buf = new byte[l_nm];
is.read(buf);
}

if(isCsiIndex)
{
mSeq = new String[readInt(is)]; // # sequences
}

mChr2tid = new HashMap<String, Integer>(this.mSeq.length);

// read sequence dictionary
int i, j, k, l = readInt(is);
buf = new byte[l];
is.read(buf);
int i, j, k;
if(!isCsiIndex)
{
buf = new byte[l_nm];
is.read(buf);
}
for (i = j = k = 0; i < buf.length; ++i) {
if (buf[i] == 0) {
byte[] b = new byte[i - j];
Expand All @@ -255,13 +317,17 @@ private void readIndex(final SeekableStream fp) throws IOException {
}
// read the index
mIndex = new TIndex[mSeq.length];

for (i = 0; i < mSeq.length; ++i) {
// the binning index
int n_bin = readInt(is);
mIndex[i] = new TIndex();
mIndex[i].b = new HashMap<Integer, TPair64[]>(n_bin);
for (j = 0; j < n_bin; ++j) {
int bin = readInt(is);
long loffset;
if(isCsiIndex)
loffset = readLong(is);
TPair64[] chunks = new TPair64[readInt(is)];
for (k = 0; k < chunks.length; ++k) {
long u = readLong(is);
Expand All @@ -271,9 +337,12 @@ private void readIndex(final SeekableStream fp) throws IOException {
mIndex[i].b.put(bin, chunks);
}
// the linear index
mIndex[i].l = new long[readInt(is)];
for (k = 0; k < mIndex[i].l.length; ++k)
mIndex[i].l[k] = readLong(is);
// Disabled for Csi format
if(!isCsiIndex) {
mIndex[i].l = new long[readInt(is)];
for (k = 0; k < mIndex[i].l.length; ++k)
mIndex[i].l[k] = readLong(is);
}
}
// close
is.close();
Expand Down Expand Up @@ -457,9 +526,22 @@ public Iterator query(final int tid, final int beg, final int end) {
long min_off;
if (tid < 0 || beg < 0 || end <= 0 || tid >= this.mIndex.length) return EOF_ITERATOR;
TIndex idx = mIndex[tid];
int[] bins = new int[MAX_BIN];
int i, l, n_off, n_bins = reg2bins(beg, end, bins);
if (idx.l.length > 0)
//int idx_len = idx.l.length;
int[] bins;
if(!isCsiIndex)
bins = new int[MAX_BIN];
else
bins = new int[((1<<3*depth) - 1)/7+1]; //plus one to prevent oob

int i, l, n_off;
int n_bins;

if(!isCsiIndex)
n_bins = reg2bins(beg, end, bins);
else
n_bins = reg2bins(beg, end, min_shift, depth, bins);

if (!isCsiIndex && idx.l.length > 0) //disable linear index for CSI
min_off = (beg >> TAD_LIDX_SHIFT >= idx.l.length) ? idx.l[idx.l.length - 1] : idx.l[beg >> TAD_LIDX_SHIFT];
else min_off = 0;
for (i = n_off = 0; i < n_bins; ++i) {
Expand Down