@Override
protected void encode(
ByteSequencesWriter writer,
ByteArrayDataOutput output,
byte[] buffer,
BytesRef spare,
long weight)
throws IOException {
if (spare.length + 5 >= buffer.length) {
buffer = ArrayUtil.grow(buffer, spare.length + 5);
}
output.reset(buffer);
output.writeBytes(spare.bytes, spare.offset, spare.length);
output.writeByte((byte) 0); // separator: not used, just for sort order
output.writeInt(encodeWeight(weight));
writer.write(buffer, 0, output.getPosition());
}
@Override
public void build(TermFreqIterator tfit) throws IOException {
if (tfit instanceof TermFreqPayloadIterator) {
throw new IllegalArgumentException("this suggester doesn't support payloads");
}
File tempInput =
File.createTempFile(
FSTCompletionLookup.class.getSimpleName(), ".input", Sort.defaultTempDir());
File tempSorted =
File.createTempFile(
FSTCompletionLookup.class.getSimpleName(), ".sorted", Sort.defaultTempDir());
Sort.ByteSequencesWriter writer = new Sort.ByteSequencesWriter(tempInput);
Sort.ByteSequencesReader reader = null;
ExternalRefSorter sorter = null;
// Push floats up front before sequences to sort them. For now, assume they are non-negative.
// If negative floats are allowed some trickery needs to be done to find their byte order.
boolean success = false;
try {
byte[] buffer = new byte[0];
ByteArrayDataOutput output = new ByteArrayDataOutput(buffer);
BytesRef spare;
while ((spare = tfit.next()) != null) {
if (spare.length + 4 >= buffer.length) {
buffer = ArrayUtil.grow(buffer, spare.length + 4);
}
output.reset(buffer);
output.writeInt(encodeWeight(tfit.weight()));
output.writeBytes(spare.bytes, spare.offset, spare.length);
writer.write(buffer, 0, output.getPosition());
}
writer.close();
// We don't know the distribution of scores and we need to bucket them, so we'll sort
// and divide into equal buckets.
SortInfo info = new Sort().sort(tempInput, tempSorted);
tempInput.delete();
FSTCompletionBuilder builder =
new FSTCompletionBuilder(
buckets, sorter = new ExternalRefSorter(new Sort()), sharedTailLength);
final int inputLines = info.lines;
reader = new Sort.ByteSequencesReader(tempSorted);
long line = 0;
int previousBucket = 0;
int previousScore = 0;
ByteArrayDataInput input = new ByteArrayDataInput();
BytesRef tmp1 = new BytesRef();
BytesRef tmp2 = new BytesRef();
while (reader.read(tmp1)) {
input.reset(tmp1.bytes);
int currentScore = input.readInt();
int bucket;
if (line > 0 && currentScore == previousScore) {
bucket = previousBucket;
} else {
bucket = (int) (line * buckets / inputLines);
}
previousScore = currentScore;
previousBucket = bucket;
// Only append the input, discard the weight.
tmp2.bytes = tmp1.bytes;
tmp2.offset = input.getPosition();
tmp2.length = tmp1.length - input.getPosition();
builder.add(tmp2, bucket);
line++;
}
// The two FSTCompletions share the same automaton.
this.higherWeightsCompletion = builder.build();
this.normalCompletion =
new FSTCompletion(higherWeightsCompletion.getFST(), false, exactMatchFirst);
success = true;
} finally {
if (success) IOUtils.close(reader, writer, sorter);
else IOUtils.closeWhileHandlingException(reader, writer, sorter);
tempInput.delete();
tempSorted.delete();
}
}
public void index(IndexWriter writer, Type valueType, long[] values, int offset, int num)
throws CorruptIndexException, IOException {
final Field valField;
if (VERBOSE) {
System.out.println(
"TEST: add docs " + offset + "-" + (offset + num) + " valType=" + valueType);
}
switch (valueType) {
case VAR_INTS:
valField = new PackedLongDocValuesField("promote", (long) 0);
break;
case FIXED_INTS_8:
valField = new ByteDocValuesField("promote", (byte) 0);
break;
case FIXED_INTS_16:
valField = new ShortDocValuesField("promote", (short) 0);
break;
case FIXED_INTS_32:
valField = new IntDocValuesField("promote", 0);
break;
case FIXED_INTS_64:
valField = new LongDocValuesField("promote", (byte) 0);
break;
case FLOAT_32:
valField = new FloatDocValuesField("promote", 0f);
break;
case FLOAT_64:
valField = new DoubleDocValuesField("promote", 0d);
break;
case BYTES_FIXED_STRAIGHT:
valField = new StraightBytesDocValuesField("promote", new BytesRef(), true);
break;
case BYTES_VAR_STRAIGHT:
valField = new StraightBytesDocValuesField("promote", new BytesRef(), false);
break;
case BYTES_FIXED_DEREF:
valField = new DerefBytesDocValuesField("promote", new BytesRef(), true);
break;
case BYTES_VAR_DEREF:
valField = new DerefBytesDocValuesField("promote", new BytesRef(), false);
break;
case BYTES_FIXED_SORTED:
valField = new SortedBytesDocValuesField("promote", new BytesRef(), true);
break;
case BYTES_VAR_SORTED:
valField = new SortedBytesDocValuesField("promote", new BytesRef(), false);
break;
default:
throw new IllegalStateException("unknown Type: " + valueType);
}
for (int i = offset; i < offset + num; i++) {
Document doc = new Document();
doc.add(new Field("id", i + "", TextField.TYPE_STORED));
switch (valueType) {
case VAR_INTS:
// TODO: can we do nextLong()?
values[i] = random().nextInt();
valField.setLongValue(values[i]);
break;
case FIXED_INTS_16:
// TODO: negatives too?
values[i] = random().nextInt(Short.MAX_VALUE);
valField.setShortValue((short) values[i]);
break;
case FIXED_INTS_32:
values[i] = random().nextInt();
valField.setIntValue((int) values[i]);
break;
case FIXED_INTS_64:
values[i] = random().nextLong();
valField.setLongValue(values[i]);
break;
case FLOAT_64:
final double nextDouble = random().nextDouble();
values[i] = Double.doubleToRawLongBits(nextDouble);
valField.setDoubleValue(nextDouble);
break;
case FLOAT_32:
final float nextFloat = random().nextFloat();
values[i] = Double.doubleToRawLongBits(nextFloat);
valField.setFloatValue(nextFloat);
break;
case FIXED_INTS_8:
values[i] = (byte) i;
valField.setByteValue((byte) values[i]);
break;
case BYTES_FIXED_DEREF:
case BYTES_FIXED_SORTED:
case BYTES_FIXED_STRAIGHT:
values[i] = random().nextLong();
byte bytes[] = new byte[8];
ByteArrayDataOutput out = new ByteArrayDataOutput(bytes, 0, 8);
out.writeLong(values[i]);
valField.setBytesValue(new BytesRef(bytes));
break;
case BYTES_VAR_DEREF:
case BYTES_VAR_SORTED:
case BYTES_VAR_STRAIGHT:
byte lbytes[] = new byte[8];
ByteArrayDataOutput lout = new ByteArrayDataOutput(lbytes, 0, 8);
final int len;
if (random().nextBoolean()) {
values[i] = random().nextInt();
lout.writeInt((int) values[i]);
len = 4;
} else {
values[i] = random().nextLong();
lout.writeLong(values[i]);
len = 8;
}
valField.setBytesValue(new BytesRef(lbytes, 0, len));
break;
default:
fail("unexpected value " + valueType);
}
if (VERBOSE) {
System.out.println(" doc " + i + " has val=" + valField);
}
doc.add(valField);
writer.addDocument(doc);
if (random().nextInt(10) == 0) {
writer.commit();
}
}
}