package org.apache.lucene.codecs.pulsing;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import java.util.IdentityHashMap;
import java.util.Map;
import org.apache.lucene.codecs.BlockTermState;
import org.apache.lucene.codecs.CodecUtil;
import org.apache.lucene.codecs.PostingsReaderBase;
import org.apache.lucene.index.DocsAndPositionsEnum;
import org.apache.lucene.index.DocsEnum;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.FieldInfo.IndexOptions;
import org.apache.lucene.index.TermState;
import org.apache.lucene.store.ByteArrayDataInput;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.util.ArrayUtil;
import org.apache.lucene.util.Attribute;
import org.apache.lucene.util.AttributeImpl;
import org.apache.lucene.util.AttributeSource;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.BytesRef;
/** Concrete class that reads the current doc/freq/skip
* postings format
* @lucene.experimental */
// TODO: -- should we switch "hasProx" higher up? and
// create two separate docs readers, one that also reads
// prox and one that doesn't?
public class PulsingPostingsReader extends PostingsReaderBase {
// Fallback reader for non-pulsed terms:
final PostingsReaderBase wrappedPostingsReader;
int maxPositions;
public PulsingPostingsReader(PostingsReaderBase wrappedPostingsReader) {
this.wrappedPostingsReader = wrappedPostingsReader;
}
@Override
public void init(IndexInput termsIn) throws IOException {
CodecUtil.checkHeader(termsIn, PulsingPostingsWriter.CODEC,
PulsingPostingsWriter.VERSION_START, PulsingPostingsWriter.VERSION_START);
maxPositions = termsIn.readVInt();
wrappedPostingsReader.init(termsIn);
}
private static class PulsingTermState extends BlockTermState {
private byte[] postings;
private int postingsSize; // -1 if this term was not inlined
private BlockTermState wrappedTermState;
ByteArrayDataInput inlinedBytesReader;
private byte[] inlinedBytes;
@Override
public PulsingTermState clone() {
PulsingTermState clone;
clone = (PulsingTermState) super.clone();
if (postingsSize != -1) {
clone.postings = new byte[postingsSize];
System.arraycopy(postings, 0, clone.postings, 0, postingsSize);
} else {
assert wrappedTermState != null;
clone.wrappedTermState = (BlockTermState) wrappedTermState.clone();
}
return clone;
}
@Override
public void copyFrom(TermState _other) {
super.copyFrom(_other);
PulsingTermState other = (PulsingTermState) _other;
postingsSize = other.postingsSize;
if (other.postingsSize != -1) {
if (postings == null || postings.length < other.postingsSize) {
postings = new byte[ArrayUtil.oversize(other.postingsSize, 1)];
}
System.arraycopy(other.postings, 0, postings, 0, other.postingsSize);
} else {
wrappedTermState.copyFrom(other.wrappedTermState);
}
// NOTE: we do not copy the
// inlinedBytes/inlinedBytesReader; these are only
// stored on the "primary" TermState. They are
// "transient" to cloned term states.
}
@Override
public String toString() {
if (postingsSize == -1) {
return "PulsingTermState: not inlined: wrapped=" + wrappedTermState;
} else {
return "PulsingTermState: inlined size=" + postingsSize + " " + super.toString();
}
}
}
@Override
public void readTermsBlock(IndexInput termsIn, FieldInfo fieldInfo, BlockTermState _termState) throws IOException {
//System.out.println("PR.readTermsBlock state=" + _termState);
final PulsingTermState termState = (PulsingTermState) _termState;
if (termState.inlinedBytes == null) {
termState.inlinedBytes = new byte[128];
termState.inlinedBytesReader = new ByteArrayDataInput();
}
int len = termsIn.readVInt();
//System.out.println(" len=" + len + " fp=" + termsIn.getFilePointer());
if (termState.inlinedBytes.length < len) {
termState.inlinedBytes = new byte[ArrayUtil.oversize(len, 1)];
}
termsIn.readBytes(termState.inlinedBytes, 0, len);
termState.inlinedBytesReader.reset(termState.inlinedBytes);
termState.wrappedTermState.termBlockOrd = 0;
wrappedPostingsReader.readTermsBlock(termsIn, fieldInfo, termState.wrappedTermState);
}
@Override
public BlockTermState newTermState() throws IOException {
PulsingTermState state = new PulsingTermState();
state.wrappedTermState = wrappedPostingsReader.newTermState();
return state;
}
@Override
public void nextTerm(FieldInfo fieldInfo, BlockTermState _termState) throws IOException {
//System.out.println("PR nextTerm");
PulsingTermState termState = (PulsingTermState) _termState;
// if we have positions, its total TF, otherwise its computed based on docFreq.
long count = fieldInfo.getIndexOptions().compareTo(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS) >= 0 ? termState.totalTermFreq : termState.docFreq;
//System.out.println(" count=" + count + " threshold=" + maxPositions);
if (count <= maxPositions) {
// Inlined into terms dict -- just read the byte[] blob in,
// but don't decode it now (we only decode when a DocsEnum
// or D&PEnum is pulled):
termState.postingsSize = termState.inlinedBytesReader.readVInt();
if (termState.postings == null || termState.postings.length < termState.postingsSize) {
termState.postings = new byte[ArrayUtil.oversize(termState.postingsSize, 1)];
}
// TODO: sort of silly to copy from one big byte[]
// (the blob holding all inlined terms' blobs for
// current term block) into another byte[] (just the
// blob for this term)...
termState.inlinedBytesReader.readBytes(termState.postings, 0, termState.postingsSize);
//System.out.println(" inlined bytes=" + termState.postingsSize);
} else {
//System.out.println(" not inlined");
termState.postingsSize = -1;
// TODO: should we do full copyFrom? much heavier...?
termState.wrappedTermState.docFreq = termState.docFreq;
termState.wrappedTermState.totalTermFreq = termState.totalTermFreq;
wrappedPostingsReader.nextTerm(fieldInfo, termState.wrappedTermState);
termState.wrappedTermState.termBlockOrd++;
}
}
@Override
public DocsEnum docs(FieldInfo field, BlockTermState _termState, Bits liveDocs, DocsEnum reuse, int flags) throws IOException {
PulsingTermState termState = (PulsingTermState) _termState;
if (termState.postingsSize != -1) {
PulsingDocsEnum postings;
if (reuse instanceof PulsingDocsEnum) {
postings = (PulsingDocsEnum) reuse;
if (!postings.canReuse(field)) {
postings = new PulsingDocsEnum(field);
}
} else {
// the 'reuse' is actually the wrapped enum
PulsingDocsEnum previous = (PulsingDocsEnum) getOther(reuse);
if (previous != null && previous.canReuse(field)) {
postings = previous;
} else {
postings = new PulsingDocsEnum(field);
}
}
if (reuse != postings) {
setOther(postings, reuse); // postings.other = reuse
}
return postings.reset(liveDocs, termState);
} else {
if (reuse instanceof PulsingDocsEnum) {
DocsEnum wrapped = wrappedPostingsReader.docs(field, termState.wrappedTermState, liveDocs, getOther(reuse), flags);
setOther(wrapped, reuse); // wrapped.other = reuse
return wrapped;
} else {
return wrappedPostingsReader.docs(field, termState.wrappedTermState, liveDocs, reuse, flags);
}
}
}
@Override
public DocsAndPositionsEnum docsAndPositions(FieldInfo field, BlockTermState _termState, Bits liveDocs, DocsAndPositionsEnum reuse,
int flags) throws IOException {
final PulsingTermState termState = (PulsingTermState) _termState;
if (termState.postingsSize != -1) {
PulsingDocsAndPositionsEnum postings;
if (reuse instanceof PulsingDocsAndPositionsEnum) {
postings = (PulsingDocsAndPositionsEnum) reuse;
if (!postings.canReuse(field)) {
postings = new PulsingDocsAndPositionsEnum(field);
}
} else {
// the 'reuse' is actually the wrapped enum
PulsingDocsAndPositionsEnum previous = (PulsingDocsAndPositionsEnum) getOther(reuse);
if (previous != null && previous.canReuse(field)) {
postings = previous;
} else {
postings = new PulsingDocsAndPositionsEnum(field);
}
}
if (reuse != postings) {
setOther(postings, reuse); // postings.other = reuse
}
return postings.reset(liveDocs, termState);
} else {
if (reuse instanceof PulsingDocsAndPositionsEnum) {
DocsAndPositionsEnum wrapped = wrappedPostingsReader.docsAndPositions(field, termState.wrappedTermState, liveDocs, (DocsAndPositionsEnum) getOther(reuse),
flags);
setOther(wrapped, reuse); // wrapped.other = reuse
return wrapped;
} else {
return wrappedPostingsReader.docsAndPositions(field, termState.wrappedTermState, liveDocs, reuse, flags);
}
}
}
private static class PulsingDocsEnum extends DocsEnum {
private byte[] postingsBytes;
private final ByteArrayDataInput postings = new ByteArrayDataInput();
private final IndexOptions indexOptions;
private final boolean storePayloads;
private final boolean storeOffsets;
private Bits liveDocs;
private int docID = -1;
private int accum;
private int freq;
private int payloadLength;
public PulsingDocsEnum(FieldInfo fieldInfo) {
indexOptions = fieldInfo.getIndexOptions();
storePayloads = fieldInfo.hasPayloads();
storeOffsets = indexOptions.compareTo(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS) >= 0;
}
public PulsingDocsEnum reset(Bits liveDocs, PulsingTermState termState) {
//System.out.println("PR docsEnum termState=" + termState + " docFreq=" + termState.docFreq);
assert termState.postingsSize != -1;
// Must make a copy of termState's byte[] so that if
// app does TermsEnum.next(), this DocsEnum is not affected
if (postingsBytes == null) {
postingsBytes = new byte[termState.postingsSize];
} else if (postingsBytes.length < termState.postingsSize) {
postingsBytes = ArrayUtil.grow(postingsBytes, termState.postingsSize);
}
System.arraycopy(termState.postings, 0, postingsBytes, 0, termState.postingsSize);
postings.reset(postingsBytes, 0, termState.postingsSize);
docID = -1;
accum = 0;
freq = 1;
payloadLength = 0;
this.liveDocs = liveDocs;
return this;
}
boolean canReuse(FieldInfo fieldInfo) {
return indexOptions == fieldInfo.getIndexOptions() && storePayloads == fieldInfo.hasPayloads();
}
@Override
public int nextDoc() throws IOException {
//System.out.println("PR nextDoc this= "+ this);
while(true) {
if (postings.eof()) {
//System.out.println("PR END");
return docID = NO_MORE_DOCS;
}
final int code = postings.readVInt();
//System.out.println(" read code=" + code);
if (indexOptions == IndexOptions.DOCS_ONLY) {
accum += code;
} else {
accum += code >>> 1; // shift off low bit
if ((code & 1) != 0) { // if low bit is set
freq = 1; // freq is one
} else {
freq = postings.readVInt(); // else read freq
}
if (indexOptions.compareTo(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS) >= 0) {
// Skip positions
if (storePayloads) {
for(int pos=0;pos<freq;pos++) {
final int posCode = postings.readVInt();
if ((posCode & 1) != 0) {
payloadLength = postings.readVInt();
}
if (storeOffsets && (postings.readVInt() & 1) != 0) {
// new offset length
postings.readVInt();
}
if (payloadLength != 0) {
postings.skipBytes(payloadLength);
}
}
} else {
for(int pos=0;pos<freq;pos++) {
// TODO: skipVInt
postings.readVInt();
if (storeOffsets && (postings.readVInt() & 1) != 0) {
// new offset length
postings.readVInt();
}
}
}
}
}
if (liveDocs == null || liveDocs.get(accum)) {
return (docID = accum);
}
}
}
@Override
public int freq() throws IOException {
return freq;
}
@Override
public int docID() {
return docID;
}
@Override
public int advance(int target) throws IOException {
int doc;
while((doc=nextDoc()) != NO_MORE_DOCS) {
if (doc >= target)
return doc;
}
return docID = NO_MORE_DOCS;
}
}
private static class PulsingDocsAndPositionsEnum extends DocsAndPositionsEnum {
private byte[] postingsBytes;
private final ByteArrayDataInput postings = new ByteArrayDataInput();
private final boolean storePayloads;
private final boolean storeOffsets;
// note: we could actually reuse across different options, if we passed this to reset()
// and re-init'ed storeOffsets accordingly (made it non-final)
private final IndexOptions indexOptions;
private Bits liveDocs;
private int docID = -1;
private int accum;
private int freq;
private int posPending;
private int position;
private int payloadLength;
private BytesRef payload;
private int startOffset;
private int offsetLength;
private boolean payloadRetrieved;
public PulsingDocsAndPositionsEnum(FieldInfo fieldInfo) {
indexOptions = fieldInfo.getIndexOptions();
storePayloads = fieldInfo.hasPayloads();
storeOffsets = indexOptions.compareTo(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS) >= 0;
}
boolean canReuse(FieldInfo fieldInfo) {
return indexOptions == fieldInfo.getIndexOptions() && storePayloads == fieldInfo.hasPayloads();
}
public PulsingDocsAndPositionsEnum reset(Bits liveDocs, PulsingTermState termState) {
assert termState.postingsSize != -1;
if (postingsBytes == null) {
postingsBytes = new byte[termState.postingsSize];
} else if (postingsBytes.length < termState.postingsSize) {
postingsBytes = ArrayUtil.grow(postingsBytes, termState.postingsSize);
}
System.arraycopy(termState.postings, 0, postingsBytes, 0, termState.postingsSize);
postings.reset(postingsBytes, 0, termState.postingsSize);
this.liveDocs = liveDocs;
payloadLength = 0;
posPending = 0;
docID = -1;
accum = 0;
startOffset = storeOffsets ? 0 : -1; // always return -1 if no offsets are stored
offsetLength = 0;
//System.out.println("PR d&p reset storesPayloads=" + storePayloads + " bytes=" + bytes.length + " this=" + this);
return this;
}
@Override
public int nextDoc() throws IOException {
//System.out.println("PR d&p nextDoc this=" + this);
while(true) {
//System.out.println(" cycle skip posPending=" + posPending);
skipPositions();
if (postings.eof()) {
//System.out.println("PR END");
return docID = NO_MORE_DOCS;
}
final int code = postings.readVInt();
accum += code >>> 1; // shift off low bit
if ((code & 1) != 0) { // if low bit is set
freq = 1; // freq is one
} else {
freq = postings.readVInt(); // else read freq
}
posPending = freq;
startOffset = storeOffsets ? 0 : -1; // always return -1 if no offsets are stored
if (liveDocs == null || liveDocs.get(accum)) {
//System.out.println(" return docID=" + docID + " freq=" + freq);
position = 0;
return (docID = accum);
}
}
}
@Override
public int freq() throws IOException {
return freq;
}
@Override
public int docID() {
return docID;
}
@Override
public int advance(int target) throws IOException {
int doc;
while((doc=nextDoc()) != NO_MORE_DOCS) {
if (doc >= target) {
return docID = doc;
}
}
return docID = NO_MORE_DOCS;
}
@Override
public int nextPosition() throws IOException {
//System.out.println("PR d&p nextPosition posPending=" + posPending + " vs freq=" + freq);
assert posPending > 0;
posPending--;
if (storePayloads) {
if (!payloadRetrieved) {
//System.out.println("PR skip payload=" + payloadLength);
postings.skipBytes(payloadLength);
}
final int code = postings.readVInt();
//System.out.println("PR code=" + code);
if ((code & 1) != 0) {
payloadLength = postings.readVInt();
//System.out.println("PR new payload len=" + payloadLength);
}
position += code >>> 1;
payloadRetrieved = false;
} else {
position += postings.readVInt();
}
if (storeOffsets) {
int offsetCode = postings.readVInt();
if ((offsetCode & 1) != 0) {
// new offset length
offsetLength = postings.readVInt();
}
startOffset += offsetCode >>> 1;
}
//System.out.println("PR d&p nextPos return pos=" + position + " this=" + this);
return position;
}
@Override
public int startOffset() {
return startOffset;
}
@Override
public int endOffset() {
return startOffset + offsetLength;
}
private void skipPositions() throws IOException {
while(posPending != 0) {
nextPosition();
}
if (storePayloads && !payloadRetrieved) {
//System.out.println(" skip payload len=" + payloadLength);
postings.skipBytes(payloadLength);
payloadRetrieved = true;
}
}
@Override
public BytesRef getPayload() throws IOException {
//System.out.println("PR getPayload payloadLength=" + payloadLength + " this=" + this);
if (payloadRetrieved) {
return payload;
} else if (storePayloads && payloadLength > 0) {
payloadRetrieved = true;
if (payload == null) {
payload = new BytesRef(payloadLength);
} else {
payload.grow(payloadLength);
}
postings.readBytes(payload.bytes, 0, payloadLength);
payload.length = payloadLength;
return payload;
} else {
return null;
}
}
}
@Override
public void close() throws IOException {
wrappedPostingsReader.close();
}
/** for a docsenum, gets the 'other' reused enum.
* Example: Pulsing(Standard).
* when doing a term range query you are switching back and forth
* between Pulsing and Standard
*
* The way the reuse works is that Pulsing.other = Standard and
* Standard.other = Pulsing.
*/
private DocsEnum getOther(DocsEnum de) {
if (de == null) {
return null;
} else {
final AttributeSource atts = de.attributes();
return atts.addAttribute(PulsingEnumAttribute.class).enums().get(this);
}
}
/**
* for a docsenum, sets the 'other' reused enum.
* see getOther for an example.
*/
private DocsEnum setOther(DocsEnum de, DocsEnum other) {
final AttributeSource atts = de.attributes();
return atts.addAttribute(PulsingEnumAttribute.class).enums().put(this, other);
}
/**
* A per-docsenum attribute that stores additional reuse information
* so that pulsing enums can keep a reference to their wrapped enums,
* and vice versa. this way we can always reuse.
*
* @lucene.internal */
public static interface PulsingEnumAttribute extends Attribute {
public Map<PulsingPostingsReader,DocsEnum> enums();
}
/**
* Implementation of {@link PulsingEnumAttribute} for reuse of
* wrapped postings readers underneath pulsing.
*
* @lucene.internal */
public static final class PulsingEnumAttributeImpl extends AttributeImpl implements PulsingEnumAttribute {
// we could store 'other', but what if someone 'chained' multiple postings readers,
// this could cause problems?
// TODO: we should consider nuking this map and just making it so if you do this,
// you don't reuse? and maybe pulsingPostingsReader should throw an exc if it wraps
// another pulsing, because this is just stupid and wasteful.
// we still have to be careful in case someone does Pulsing(Stomping(Pulsing(...
private final Map<PulsingPostingsReader,DocsEnum> enums =
new IdentityHashMap<PulsingPostingsReader,DocsEnum>();
public Map<PulsingPostingsReader,DocsEnum> enums() {
return enums;
}
@Override
public void clear() {
// our state is per-docsenum, so this makes no sense.
// its best not to clear, in case a wrapped enum has a per-doc attribute or something
// and is calling clearAttributes(), so they don't nuke the reuse information!
}
@Override
public void copyTo(AttributeImpl target) {
// this makes no sense for us, because our state is per-docsenum.
// we don't want to copy any stuff over to another docsenum ever!
}
}
}