/**
* This load a chunk (just the document ids!) and decompress it
*
* @throws IOException
*/
protected final void load() throws IOException {
chunkSize = (numberOfEntries > chunkSize) ? chunkSize : numberOfEntries;
idsCodec.decompress(input, ids, chunkSize);
Delta.inverseDelta(ids, chunkSize);
currentPosting = -1;
blkCnt = 0;
decompressed = false;
}
/**
* Read the posting components from the chunk
*
* @param pos the posting to load (as index in the internal arrays)
* @throws IOException
*/
protected final void get(final int pos) throws IOException {
if (!decompressed) decompress();
id = ids[pos];
tf = tfs[pos];
if (fieldsCount > 0) {
for (int j = 0; j < fieldsCount; j++)
fields[j] = fieldsMatrix[j][pos] - 1; // -1, to deal with gamma and unary codec
}
if (hasBlocks > 0) {
bf = bfs[pos];
for (int i = currentPosting + 1; i < pos; i++) blkCnt += bfs[i];
blocks = Arrays.copyOfRange(blocksMatrix, blkCnt, blkCnt + bf);
Delta.inverseDelta(blocks, blocks.length);
blkCnt += bf; // <-- because currentPosting may start from -1
}
numberOfEntries -= pos - currentPosting;
currentPosting = pos;
}