org.apache.lucene.index.SegmentWriteState#org.apache.lucene.index.SegmentReadState源码实例Demo

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  FieldsProducer postings = PostingsFormat.forName("Lucene84").fieldsProducer(state);
  if (state.context.context != IOContext.Context.MERGE) {
    FieldsProducer loadedPostings;
    try {
      postings.checkIntegrity();
      loadedPostings = new DirectFields(state, postings, minSkipCount, lowFreqCutoff);
    } finally {
      postings.close();
    }
    return loadedPostings;
  } else {
    // Don't load postings for merge:
    return postings;
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState readState)
  throws IOException {

  // Load our ID:
  final String idFileName = IndexFileNames.segmentFileName(readState.segmentInfo.name, readState.segmentSuffix, ID_EXTENSION);
  IndexInput in = readState.directory.openInput(idFileName, readState.context);
  boolean success = false;
  final int id;
  try {
    CodecUtil.checkHeader(in, RAM_ONLY_NAME, VERSION_START, VERSION_LATEST);
    id = in.readVInt();
    success = true;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(in);
    } else {
      IOUtils.close(in);
    }
  }
  
  synchronized(state) {
    return state.get(id);
  }
}
 

@Override
public PointsReader fieldsReader(SegmentReadState state) {
  return new PointsReader() {
    @Override
    public void close() {
    }

    @Override
    public long ramBytesUsed() {
      return 0L;
    }

    @Override
    public void checkIntegrity() {
    }

    @Override
    public PointValues getValues(String field) {
      throw new IllegalArgumentException("field=\"" + field + "\" was not indexed with points");
    }
  };
}
 

public CompletionFieldsProducer(SegmentReadState state) throws IOException {
    String suggestFSTFile = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, EXTENSION);
    IndexInput input = state.directory.openInput(suggestFSTFile, state.context);
    version = CodecUtil.checkHeader(input, CODEC_NAME, SUGGEST_CODEC_VERSION, SUGGEST_VERSION_CURRENT);
    FieldsProducer delegateProducer = null;
    boolean success = false;
    try {
        PostingsFormat delegatePostingsFormat = PostingsFormat.forName(input.readString());
        String providerName = input.readString();
        CompletionLookupProvider completionLookupProvider = providers.get(providerName);
        if (completionLookupProvider == null) {
            throw new IllegalStateException("no provider with name [" + providerName + "] registered");
        }
        // TODO: we could clone the ReadState and make it always forward IOContext.MERGE to prevent unecessary heap usage?
        delegateProducer = delegatePostingsFormat.fieldsProducer(state);
        /*
         * If we are merging we don't load the FSTs at all such that we
         * don't consume so much memory during merge
         */
        if (state.context.context != Context.MERGE) {
            // TODO: maybe we can do this in a fully lazy fashion based on some configuration
            // eventually we should have some kind of curciut breaker that prevents us from going OOM here
            // with some configuration
            this.lookupFactory = completionLookupProvider.load(input);
        } else {
            this.lookupFactory = null;
        }
        this.delegateProducer = delegateProducer;
        success = true;
    } finally {
        if (!success) {
            IOUtils.closeWhileHandlingException(delegateProducer, input);
        } else {
            IOUtils.close(input);
        }
    }
}
 

private static Codec getCodec() {
  if (Codec.getDefault().getName().equals("Lucene84")) {
    int maxPointsInLeafNode = TestUtil.nextInt(random(), 16, 2048);
    double maxMBSortInHeap = 3.0 + (3*random().nextDouble());
    if (VERBOSE) {
      System.out.println("TEST: using Lucene60PointsFormat with maxPointsInLeafNode=" + maxPointsInLeafNode + " and maxMBSortInHeap=" + maxMBSortInHeap);
    }

    return new FilterCodec("Lucene84", Codec.getDefault()) {
      @Override
      public PointsFormat pointsFormat() {
        return new PointsFormat() {
          @Override
          public PointsWriter fieldsWriter(SegmentWriteState writeState) throws IOException {
            return new Lucene86PointsWriter(writeState, maxPointsInLeafNode, maxMBSortInHeap);
          }

          @Override
          public PointsReader fieldsReader(SegmentReadState readState) throws IOException {
            return new Lucene86PointsReader(readState);
          }
        };
      }
    };
  } else {
    return Codec.getDefault();
  }
}
 

public FSTTermsReader(SegmentReadState state, PostingsReaderBase postingsReader) throws IOException {
  final String termsFileName = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, FSTTermsWriter.TERMS_EXTENSION);

  this.postingsReader = postingsReader;
  final IndexInput in = state.directory.openInput(termsFileName, state.context);

  boolean success = false;
  try {
    CodecUtil.checkIndexHeader(in, FSTTermsWriter.TERMS_CODEC_NAME,
                                     FSTTermsWriter.TERMS_VERSION_START,
                                     FSTTermsWriter.TERMS_VERSION_CURRENT,
                                     state.segmentInfo.getId(), state.segmentSuffix);
    CodecUtil.checksumEntireFile(in);
    this.postingsReader.init(in, state);
    seekDir(in);

    final FieldInfos fieldInfos = state.fieldInfos;
    final int numFields = in.readVInt();
    for (int i = 0; i < numFields; i++) {
      int fieldNumber = in.readVInt();
      FieldInfo fieldInfo = fieldInfos.fieldInfo(fieldNumber);
      long numTerms = in.readVLong();
      long sumTotalTermFreq = in.readVLong();
      // if frequencies are omitted, sumTotalTermFreq=sumDocFreq and we only write one value
      long sumDocFreq = fieldInfo.getIndexOptions() == IndexOptions.DOCS ? sumTotalTermFreq : in.readVLong();
      int docCount = in.readVInt();
      TermsReader current = new TermsReader(fieldInfo, in, numTerms, sumTotalTermFreq, sumDocFreq, docCount);
      TermsReader previous = fields.put(fieldInfo.name, current);
      checkFieldSummary(state.segmentInfo, in, current, previous);
    }
    success = true;
  } finally {
    if (success) {
      IOUtils.close(in);
    } else {
      IOUtils.closeWhileHandlingException(in);
    }
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postingsReader = new Lucene84PostingsReader(state);
  boolean success = false;
  try {
    FieldsProducer ret = new FSTTermsReader(state, postingsReader);
    success = true;
    return ret;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(postingsReader);
    }
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postingsReader = new Lucene84PostingsReader(state);
  boolean success = false;
  try {
    FieldsProducer ret = new OrdsBlockTreeTermsReader(postingsReader, state);
    success = true;
    return ret;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(postingsReader);
    }
  }
}
 

public SimpleTextPointsReader(SegmentReadState readState) throws IOException {
  // Initialize readers now:

  // Read index:
  Map<String,Long> fieldToFileOffset = new HashMap<>();

  String indexFileName = IndexFileNames.segmentFileName(readState.segmentInfo.name, readState.segmentSuffix, SimpleTextPointsFormat.POINT_INDEX_EXTENSION);
  try (ChecksumIndexInput in = readState.directory.openChecksumInput(indexFileName, IOContext.DEFAULT)) {
    readLine(in);
    int count = parseInt(FIELD_COUNT);
    for(int i=0;i<count;i++) {
      readLine(in);
      String fieldName = stripPrefix(FIELD_FP_NAME);
      readLine(in);
      long fp = parseLong(FIELD_FP);
      fieldToFileOffset.put(fieldName, fp);
    }
    SimpleTextUtil.checkFooter(in);
  }

  boolean success = false;
  String fileName = IndexFileNames.segmentFileName(readState.segmentInfo.name, readState.segmentSuffix, SimpleTextPointsFormat.POINT_EXTENSION);
  dataIn = readState.directory.openInput(fileName, IOContext.DEFAULT);
  try {
    for(Map.Entry<String,Long> ent : fieldToFileOffset.entrySet()) {
      readers.put(ent.getKey(), initReader(ent.getValue()));
    }
    success = true;
  } finally {
    if (success == false) {
      IOUtils.closeWhileHandlingException(this);
    }
  }
      
  this.readState = readState;
}
 

public SimpleTextFieldsReader(SegmentReadState state) throws IOException {
  this.maxDoc = state.segmentInfo.maxDoc();
  fieldInfos = state.fieldInfos;
  in = state.directory.openInput(SimpleTextPostingsFormat.getPostingsFileName(state.segmentInfo.name, state.segmentSuffix), state.context);
  boolean success = false;
  try {
    fields = readFields(in.clone());
    success = true;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(this);
    }
  }
}
 

public BloomFilteredFieldsProducer(SegmentReadState state)
    throws IOException {
  
  String bloomFileName = IndexFileNames.segmentFileName(
      state.segmentInfo.name, state.segmentSuffix, BLOOM_EXTENSION);
  ChecksumIndexInput bloomIn = null;
  boolean success = false;
  try {
    bloomIn = state.directory.openChecksumInput(bloomFileName, state.context);
    CodecUtil.checkIndexHeader(bloomIn, BLOOM_CODEC_NAME, VERSION_START, VERSION_CURRENT, state.segmentInfo.getId(), state.segmentSuffix);
    // // Load the hash function used in the BloomFilter
    // hashFunction = HashFunction.forName(bloomIn.readString());
    // Load the delegate postings format
    PostingsFormat delegatePostingsFormat = PostingsFormat.forName(bloomIn
        .readString());
    
    this.delegateFieldsProducer = delegatePostingsFormat
        .fieldsProducer(state);
    int numBlooms = bloomIn.readInt();
    for (int i = 0; i < numBlooms; i++) {
      int fieldNum = bloomIn.readInt();
      FuzzySet bloom = FuzzySet.deserialize(bloomIn);
      FieldInfo fieldInfo = state.fieldInfos.fieldInfo(fieldNum);
      bloomsByFieldName.put(fieldInfo.name, bloom);
    }
    CodecUtil.checkFooter(bloomIn);
    IOUtils.close(bloomIn);
    success = true;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(bloomIn, delegateFieldsProducer);
    }
  }
}
 

protected void fillFieldMap(PostingsReaderBase postingsReader, SegmentReadState state, BlockDecoder blockDecoder,
                            boolean dictionaryOnHeap, IndexInput dictionaryInput, IndexInput blockInput,
                            Collection<FieldMetadata> fieldMetadataCollection, FieldInfos fieldInfos) throws IOException {
  for (FieldMetadata fieldMetadata : fieldMetadataCollection) {
    IndexDictionary.BrowserSupplier dictionaryBrowserSupplier = createDictionaryBrowserSupplier(state, dictionaryInput, fieldMetadata, blockDecoder, dictionaryOnHeap);
    fieldToTermsMap.put(fieldMetadata.getFieldInfo().name,
        new UniformSplitTerms(blockInput, fieldMetadata, postingsReader, blockDecoder, dictionaryBrowserSupplier));
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postingsReader = new Lucene84PostingsReader(state);
  boolean success = false;
  try {
    FieldsProducer termsReader = createUniformSplitTermsReader(postingsReader, state, blockDecoder);
    success = true;
    return termsReader;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(postingsReader);
    }
  }
}
 

/**
 * @see UniformSplitTermsReader#UniformSplitTermsReader(PostingsReaderBase, SegmentReadState, BlockDecoder, boolean)
 */
protected STUniformSplitTermsReader(PostingsReaderBase postingsReader, SegmentReadState state, BlockDecoder blockDecoder,
                                    boolean dictionaryOnHeap, FieldMetadata.Serializer fieldMetadataReader,
                                    String codecName, int versionStart, int versionCurrent,
                                    String termsBlocksExtension, String dictionaryExtension) throws IOException {
  super(postingsReader, state, blockDecoder, dictionaryOnHeap, fieldMetadataReader, codecName, versionStart, versionCurrent, termsBlocksExtension, dictionaryExtension);
}
 

@Override
protected void fillFieldMap(PostingsReaderBase postingsReader, SegmentReadState state, BlockDecoder blockDecoder,
                            boolean dictionaryOnHeap, IndexInput dictionaryInput, IndexInput blockInput,
                            Collection<FieldMetadata> fieldMetadataCollection, FieldInfos fieldInfos) throws IOException {
  if (!fieldMetadataCollection.isEmpty()) {
    FieldMetadata unionFieldMetadata = createUnionFieldMetadata(fieldMetadataCollection);
    // Share the same immutable dictionary between all fields.
    IndexDictionary.BrowserSupplier dictionaryBrowserSupplier = createDictionaryBrowserSupplier(state, dictionaryInput, unionFieldMetadata, blockDecoder, dictionaryOnHeap);
    for (FieldMetadata fieldMetadata : fieldMetadataCollection) {
      fieldToTermsMap.put(fieldMetadata.getFieldInfo().name,
          new STUniformSplitTerms(blockInput, fieldMetadata, unionFieldMetadata, postingsReader, blockDecoder, fieldInfos, dictionaryBrowserSupplier));
    }
  }
}
 

CompletionFieldsProducer(String codecName, SegmentReadState state, FSTLoadMode fstLoadMode) throws IOException {
  String indexFile = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, INDEX_EXTENSION);
  delegateFieldsProducer = null;
  boolean success = false;

  try (ChecksumIndexInput index = state.directory.openChecksumInput(indexFile, state.context)) {
    // open up dict file containing all fsts
    String dictFile = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, DICT_EXTENSION);
    dictIn = state.directory.openInput(dictFile, state.context);
    CodecUtil.checkIndexHeader(dictIn, codecName, COMPLETION_CODEC_VERSION, COMPLETION_VERSION_CURRENT, state.segmentInfo.getId(), state.segmentSuffix);
    // just validate the footer for the dictIn
    CodecUtil.retrieveChecksum(dictIn);

    // open up index file (fieldNumber, offset)
    CodecUtil.checkIndexHeader(index, codecName, COMPLETION_CODEC_VERSION, COMPLETION_VERSION_CURRENT, state.segmentInfo.getId(), state.segmentSuffix);
    // load delegate PF
    PostingsFormat delegatePostingsFormat = PostingsFormat.forName(index.readString());
    delegateFieldsProducer = delegatePostingsFormat.fieldsProducer(state);

    // read suggest field numbers and their offsets in the terms file from index
    int numFields = index.readVInt();
    readers = new HashMap<>(numFields);
    for (int i = 0; i < numFields; i++) {
      int fieldNumber = index.readVInt();
      long offset = index.readVLong();
      long minWeight = index.readVLong();
      long maxWeight = index.readVLong();
      byte type = index.readByte();
      FieldInfo fieldInfo = state.fieldInfos.fieldInfo(fieldNumber);
      // we don't load the FST yet
      readers.put(fieldInfo.name, new CompletionsTermsReader(dictIn, offset, minWeight, maxWeight, type, fstLoadMode));
    }
    CodecUtil.checkFooter(index);
    success = true;
  } finally {
    if (success == false) {
      IOUtils.closeWhileHandlingException(delegateFieldsProducer, dictIn);
    }
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postingsReader = new IDVersionPostingsReader();
  boolean success = false;
   try {
     FieldsProducer ret = new VersionBlockTreeTermsReader(postingsReader, state);
     success = true;
     return ret;
   } finally {
     if (!success) {
       IOUtils.closeWhileHandlingException(postingsReader);
     }
   }
}
 

@Override
public void init(IndexInput termsIn, SegmentReadState state) throws IOException {
  // Make sure we are talking to the matching postings writer
  CodecUtil.checkIndexHeader(termsIn,
                               IDVersionPostingsWriter.TERMS_CODEC,
                               IDVersionPostingsWriter.VERSION_START,
                               IDVersionPostingsWriter.VERSION_CURRENT,
                               state.segmentInfo.getId(), state.segmentSuffix);
}
 

@Override
public NormsProducer normsProducer(SegmentReadState state) throws IOException {
  assert state.fieldInfos.hasNorms();
  NormsProducer producer = in.normsProducer(state);
  assert producer != null;
  return new AssertingNormsProducer(producer, state.segmentInfo.maxDoc(), false);
}
 

@Override
public DocValuesProducer fieldsProducer(SegmentReadState state) throws IOException {
  assert state.fieldInfos.hasDocValues();
  DocValuesProducer producer = in.fieldsProducer(state);
  assert producer != null;
  return new AssertingDocValuesProducer(producer, state.segmentInfo.maxDoc(), false);
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postings = new Lucene84PostingsReader(state);
  TermsIndexReaderBase indexReader;

  boolean success = false;
  try {
    indexReader = new VariableGapTermsIndexReader(state);
    success = true;
  } finally {
    if (!success) {
      postings.close();
    }
  }

  success = false;
  try {
    FieldsProducer ret = new BlockTermsReader(indexReader, postings, state);
    success = true;
    return ret;
  } finally {
    if (!success) {
      try {
        postings.close();
      } finally {
        indexReader.close();
      }
    }
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postings = new Lucene84PostingsReader(state);
  TermsIndexReaderBase indexReader;

  boolean success = false;
  try {
    indexReader = new FixedGapTermsIndexReader(state);
    success = true;
  } finally {
    if (!success) {
      postings.close();
    }
  }

  success = false;
  try {
    FieldsProducer ret = new BlockTermsReader(indexReader, postings, state);
    success = true;
    return ret;
  } finally {
    if (!success) {
      try {
        postings.close();
      } finally {
        indexReader.close();
      }
    }
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postings = new Lucene84PostingsReader(state);
  TermsIndexReaderBase indexReader;

  boolean success = false;
  try {
    indexReader = new VariableGapTermsIndexReader(state);
    success = true;
  } finally {
    if (!success) {
      postings.close();
    }
  }

  success = false;
  try {
    FieldsProducer ret = new BlockTermsReader(indexReader, postings, state);
    success = true;
    return ret;
  } finally {
    if (!success) {
      try {
        postings.close();
      } finally {
        indexReader.close();
      }
    }
  }
}
 

Lucene80NormsProducer(SegmentReadState state, String dataCodec, String dataExtension, String metaCodec, String metaExtension) throws IOException {
  maxDoc = state.segmentInfo.maxDoc();
  String metaName = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, metaExtension);
  int version = -1;

  // read in the entries from the metadata file.
  try (ChecksumIndexInput in = state.directory.openChecksumInput(metaName, state.context)) {
    Throwable priorE = null;
    try {
      version = CodecUtil.checkIndexHeader(in, metaCodec, VERSION_START, VERSION_CURRENT, state.segmentInfo.getId(), state.segmentSuffix);
      readFields(in, state.fieldInfos);
    } catch (Throwable exception) {
      priorE = exception;
    } finally {
      CodecUtil.checkFooter(in, priorE);
    }
  }

  String dataName = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, dataExtension);
  data = state.directory.openInput(dataName, state.context);
  boolean success = false;
  try {
    final int version2 = CodecUtil.checkIndexHeader(data, dataCodec, VERSION_START, VERSION_CURRENT, state.segmentInfo.getId(), state.segmentSuffix);
    if (version != version2) {
      throw new CorruptIndexException("Format versions mismatch: meta=" + version + ",data=" + version2, data);
    }

    // NOTE: data file is too costly to verify checksum against all the bytes on open,
    // but for now we at least verify proper structure of the checksum footer: which looks
    // for FOOTER_MAGIC + algorithmID. This is cheap and can detect some forms of corruption
    // such as file truncation.
    CodecUtil.retrieveChecksum(data);

    success = true;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(this.data);
    }
  }
}
 

public FieldsReader(final SegmentReadState readState) throws IOException {

      // Read _X.per and init each format:
      boolean success = false;
      try {
        // Read field name -> format name
        for (FieldInfo fi : readState.fieldInfos) {
          if (fi.getIndexOptions() != IndexOptions.NONE) {
            final String fieldName = fi.name;
            final String formatName = fi.getAttribute(PER_FIELD_FORMAT_KEY);
            if (formatName != null) {
              // null formatName means the field is in fieldInfos, but has no postings!
              final String suffix = fi.getAttribute(PER_FIELD_SUFFIX_KEY);
              if (suffix == null) {
                throw new IllegalStateException("missing attribute: " + PER_FIELD_SUFFIX_KEY + " for field: " + fieldName);
              }
              PostingsFormat format = PostingsFormat.forName(formatName);
              String segmentSuffix = getSuffix(formatName, suffix);
              if (!formats.containsKey(segmentSuffix)) {
                formats.put(segmentSuffix, format.fieldsProducer(new SegmentReadState(readState, segmentSuffix)));
              }
              fields.put(fieldName, formats.get(segmentSuffix));
            }
          }
        }
        success = true;
      } finally {
        if (!success) {
          IOUtils.closeWhileHandlingException(formats.values());
        }
      }

      this.segment = readState.segmentInfo.name;
    }
 

public FieldsReader(final SegmentReadState readState) throws IOException {

      // Init each unique format:
      boolean success = false;
      try {
        // Read field name -> format name
        for (FieldInfo fi : readState.fieldInfos) {
          if (fi.getDocValuesType() != DocValuesType.NONE) {
            final String fieldName = fi.name;
            final String formatName = fi.getAttribute(PER_FIELD_FORMAT_KEY);
            if (formatName != null) {
              // null formatName means the field is in fieldInfos, but has no docvalues!
              final String suffix = fi.getAttribute(PER_FIELD_SUFFIX_KEY);
              if (suffix == null) {
                throw new IllegalStateException("missing attribute: " + PER_FIELD_SUFFIX_KEY + " for field: " + fieldName);
              }
              DocValuesFormat format = DocValuesFormat.forName(formatName);
              String segmentSuffix = getFullSegmentSuffix(readState.segmentSuffix, getSuffix(formatName, suffix));
              if (!formats.containsKey(segmentSuffix)) {
                formats.put(segmentSuffix, format.fieldsProducer(new SegmentReadState(readState, segmentSuffix)));
              }
              fields.put(fieldName, formats.get(segmentSuffix));
            }
          }
        }
        success = true;
      } finally {
        if (!success) {
          IOUtils.closeWhileHandlingException(formats.values());
        }
      }
    }
 

@Override
public void init(IndexInput termsIn, SegmentReadState state) throws IOException {
  // Make sure we are talking to the matching postings writer
  CodecUtil.checkIndexHeader(termsIn, TERMS_CODEC, VERSION_START, VERSION_CURRENT, state.segmentInfo.getId(), state.segmentSuffix);
  final int indexBlockSize = termsIn.readVInt();
  if (indexBlockSize != BLOCK_SIZE) {
    throw new IllegalStateException("index-time BLOCK_SIZE (" + indexBlockSize + ") != read-time BLOCK_SIZE (" + BLOCK_SIZE + ")");
  }
}
 

public TestLucene86PointsFormat() {
  // standard issue
  Codec defaultCodec = new Lucene86Codec();
  if (random().nextBoolean()) {
    // randomize parameters
    maxPointsInLeafNode = TestUtil.nextInt(random(), 50, 500);
    double maxMBSortInHeap = 3.0 + (3*random().nextDouble());
    if (VERBOSE) {
      System.out.println("TEST: using Lucene60PointsFormat with maxPointsInLeafNode=" + maxPointsInLeafNode + " and maxMBSortInHeap=" + maxMBSortInHeap);
    }

    // sneaky impersonation!
    codec = new FilterCodec(defaultCodec.getName(), defaultCodec) {
      @Override
      public PointsFormat pointsFormat() {
        return new PointsFormat() {
          @Override
          public PointsWriter fieldsWriter(SegmentWriteState writeState) throws IOException {
            return new Lucene86PointsWriter(writeState, maxPointsInLeafNode, maxMBSortInHeap);
          }

          @Override
          public PointsReader fieldsReader(SegmentReadState readState) throws IOException {
            return new Lucene86PointsReader(readState);
          }
        };
      }
    };
  } else {
    // standard issue
    codec = defaultCodec;
    maxPointsInLeafNode = BKDWriter.DEFAULT_MAX_POINTS_IN_LEAF_NODE;
  }
}
 

private static Codec getCodec() {
  if (Codec.getDefault().getName().equals("Lucene84")) {
    int maxPointsInLeafNode = TestUtil.nextInt(random(), 16, 2048);
    double maxMBSortInHeap = 5.0 + (3*random().nextDouble());
    if (VERBOSE) {
      System.out.println("TEST: using Lucene60PointsFormat with maxPointsInLeafNode=" + maxPointsInLeafNode + " and maxMBSortInHeap=" + maxMBSortInHeap);
    }

    return new FilterCodec("Lucene84", Codec.getDefault()) {
      @Override
      public PointsFormat pointsFormat() {
        return new PointsFormat() {
          @Override
          public PointsWriter fieldsWriter(SegmentWriteState writeState) throws IOException {
            return new Lucene86PointsWriter(writeState, maxPointsInLeafNode, maxMBSortInHeap);
          }

          @Override
          public PointsReader fieldsReader(SegmentReadState readState) throws IOException {
            return new Lucene86PointsReader(readState);
          }
        };
      }
    };
  } else {
    return Codec.getDefault();
  }
}
 

@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
  PostingsReaderBase postingsReader = new Lucene50PostingsReader(state);
  boolean success = false;
  try {
    FieldsProducer ret = new BlockTreeTermsReader(postingsReader, state);
    success = true;
    return ret;
  } finally {
    if (!success) {
      IOUtils.closeWhileHandlingException(postingsReader);
    }
  }
}