org.apache.lucene.index

## Class CodecReader

- java.lang.Object
- - org.apache.lucene.index.IndexReader
  - - org.apache.lucene.index.LeafReader
    - - org.apache.lucene.index.CodecReader

- All Implemented Interfaces:
    Closeable, AutoCloseable, Accountable
  Direct Known Subclasses:
    FilterCodecReader, SegmentReader

      public abstract class CodecReader
      extends LeafReader
      implements Accountable

  LeafReader implemented by codec APIs.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader

      `IndexReader.CacheHelper, IndexReader.CacheKey, IndexReader.ClosedListener`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `CodecReader()` Sole constructor.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `checkIntegrity()` Checks consistency of this reader.
    `protected void` | `doClose()` Implements close.
    `void` | `document(int docID, StoredFieldVisitor visitor)` Expert: visits the fields of a stored document, for custom processing/loading of each field.
    `BinaryDocValues` | `getBinaryDocValues(String field)` Returns `BinaryDocValues` for this field, or null if no binary doc values were indexed for this field.
    `Collection<Accountable>` | `getChildResources()` Returns nested resources of this class.
    `abstract DocValuesProducer` | `getDocValuesReader()` Expert: retrieve underlying DocValuesProducer
    `abstract StoredFieldsReader` | `getFieldsReader()` Expert: retrieve thread-private StoredFieldsReader
    `abstract NormsProducer` | `getNormsReader()` Expert: retrieve underlying NormsProducer
    `NumericDocValues` | `getNormValues(String field)` Returns `NumericDocValues` representing norms for this field, or null if no `NumericDocValues` were indexed.
    `NumericDocValues` | `getNumericDocValues(String field)` Returns `NumericDocValues` for this field, or null if no numeric doc values were indexed for this field.
    `abstract PointsReader` | `getPointsReader()` Expert: retrieve underlying PointsReader
    `PointValues` | `getPointValues(String field)` Returns the `PointValues` used for numeric or spatial searches for the given field, or null if there are no point fields.
    `abstract FieldsProducer` | `getPostingsReader()` Expert: retrieve underlying FieldsProducer
    `SortedDocValues` | `getSortedDocValues(String field)` Returns `SortedDocValues` for this field, or null if no `SortedDocValues` were indexed for this field.
    `SortedNumericDocValues` | `getSortedNumericDocValues(String field)` Returns `SortedNumericDocValues` for this field, or null if no `SortedNumericDocValues` were indexed for this field.
    `SortedSetDocValues` | `getSortedSetDocValues(String field)` Returns `SortedSetDocValues` for this field, or null if no `SortedSetDocValues` were indexed for this field.
    `Fields` | `getTermVectors(int docID)` Retrieve term vectors for this document, or null if term vectors were not indexed.
    `abstract TermVectorsReader` | `getTermVectorsReader()` Expert: retrieve thread-private TermVectorsReader
    `long` | `ramBytesUsed()` Return the memory usage of this object in bytes.
    `Terms` | `terms(String field)` Returns the `Terms` index for this field, or null if it has none.

    - ### Methods inherited from class org.apache.lucene.index.LeafReader

      `docFreq, getContext, getCoreCacheHelper, getDocCount, getFieldInfos, getLiveDocs, getMetaData, getSumDocFreq, getSumTotalTermFreq, postings, postings, totalTermFreq`

    - ### Methods inherited from class org.apache.lucene.index.IndexReader

      `close, decRef, document, document, ensureOpen, equals, getReaderCacheHelper, getRefCount, getTermVector, hasDeletions, hashCode, incRef, leaves, maxDoc, numDeletedDocs, numDocs, registerParentReader, tryIncRef`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### CodecReader

          protected CodecReader()

      Sole constructor. (For invocation by subclass constructors, typically implicit.)

  - ### Method Detail

    - #### getFieldsReader

          public abstract StoredFieldsReader getFieldsReader()

      Expert: retrieve thread-private StoredFieldsReader
      NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

    - #### getTermVectorsReader

          public abstract TermVectorsReader getTermVectorsReader()

      Expert: retrieve thread-private TermVectorsReader
      NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

    - #### getNormsReader

          public abstract NormsProducer getNormsReader()

      Expert: retrieve underlying NormsProducer
      NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

    - #### getDocValuesReader

          public abstract DocValuesProducer getDocValuesReader()

      Expert: retrieve underlying DocValuesProducer
      NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

    - #### getPostingsReader

          public abstract FieldsProducer getPostingsReader()

      Expert: retrieve underlying FieldsProducer
      NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

    - #### getPointsReader

          public abstract PointsReader getPointsReader()

      Expert: retrieve underlying PointsReader
      NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

    - #### document

          public final void document(int docID,
                                     StoredFieldVisitor visitor)
                              throws IOException

      Description copied from class: `IndexReader`
      Expert: visits the fields of a stored document, for custom processing/loading of each field. If you simply want to load all fields, use `IndexReader.document(int)`. If you want to load a subset, use `DocumentStoredFieldVisitor`.
      Specified by:
        `document` in class `IndexReader`
      Throws:
        `IOException`

    - #### getTermVectors

          public final Fields getTermVectors(int docID)
                                      throws IOException

      Description copied from class: `IndexReader`
      Retrieve term vectors for this document, or null if term vectors were not indexed. The returned Fields instance acts like a single-document inverted index (the docID will be 0).
      Specified by:
        `getTermVectors` in class `IndexReader`
      Throws:
        `IOException`

    - #### terms

          public final Terms terms(String field)
                            throws IOException

      Description copied from class: `LeafReader`
      Returns the `Terms` index for this field, or null if it has none.
      Specified by:
        `terms` in class `LeafReader`
      Throws:
        `IOException`

    - #### getNumericDocValues

          public final NumericDocValues getNumericDocValues(String field)
                                                     throws IOException

      Description copied from class: `LeafReader`
      Returns `NumericDocValues` for this field, or null if no numeric doc values were indexed for this field. The returned instance should only be used by a single thread.
      Specified by:
        `getNumericDocValues` in class `LeafReader`
      Throws:
        `IOException`

    - #### getBinaryDocValues

          public final BinaryDocValues getBinaryDocValues(String field)
                                                   throws IOException

      Description copied from class: `LeafReader`
      Returns `BinaryDocValues` for this field, or null if no binary doc values were indexed for this field. The returned instance should only be used by a single thread.
      Specified by:
        `getBinaryDocValues` in class `LeafReader`
      Throws:
        `IOException`

    - #### getSortedDocValues

          public final SortedDocValues getSortedDocValues(String field)
                                                   throws IOException

      Description copied from class: `LeafReader`
      Returns `SortedDocValues` for this field, or null if no `SortedDocValues` were indexed for this field. The returned instance should only be used by a single thread.
      Specified by:
        `getSortedDocValues` in class `LeafReader`
      Throws:
        `IOException`

    - #### getSortedNumericDocValues

          public final SortedNumericDocValues getSortedNumericDocValues(String field)
                                                                 throws IOException

      Description copied from class: `LeafReader`
      Returns `SortedNumericDocValues` for this field, or null if no `SortedNumericDocValues` were indexed for this field. The returned instance should only be used by a single thread.
      Specified by:
        `getSortedNumericDocValues` in class `LeafReader`
      Throws:
        `IOException`

    - #### getSortedSetDocValues

          public final SortedSetDocValues getSortedSetDocValues(String field)
                                                         throws IOException

      Description copied from class: `LeafReader`
      Returns `SortedSetDocValues` for this field, or null if no `SortedSetDocValues` were indexed for this field. The returned instance should only be used by a single thread.
      Specified by:
        `getSortedSetDocValues` in class `LeafReader`
      Throws:
        `IOException`

    - #### getNormValues

          public final NumericDocValues getNormValues(String field)
                                               throws IOException

      Description copied from class: `LeafReader`
      Returns `NumericDocValues` representing norms for this field, or null if no `NumericDocValues` were indexed. The returned instance should only be used by a single thread.
      Specified by:
        `getNormValues` in class `LeafReader`
      Throws:
        `IOException`

    - #### getPointValues

          public final PointValues getPointValues(String field)
                                           throws IOException

      Description copied from class: `LeafReader`
      Returns the `PointValues` used for numeric or spatial searches for the given field, or null if there are no point fields.
      Specified by:
        `getPointValues` in class `LeafReader`
      Throws:
        `IOException`

    - #### doClose

          protected void doClose()
                          throws IOException

      Description copied from class: `IndexReader`
      Implements close.
      Specified by:
        `doClose` in class `IndexReader`
      Throws:
        `IOException`

    - #### ramBytesUsed

          public long ramBytesUsed()

      Description copied from interface: `Accountable`
      Return the memory usage of this object in bytes. Negative values are illegal.
      Specified by:
        `ramBytesUsed` in interface `Accountable`

    - #### getChildResources

          public Collection<Accountable> getChildResources()

      Description copied from interface: `Accountable`
      Returns nested resources of this class. The result should be a point-in-time snapshot (to avoid race conditions).
      Specified by:
        `getChildResources` in interface `Accountable`
      See Also:
        `Accountables`

    - #### checkIntegrity

          public void checkIntegrity()
                              throws IOException

      Description copied from class: `LeafReader`
      Checks consistency of this reader.

      Note that this may be costly in terms of I/O, e.g. may involve computing a checksum value against large data files.

      Specified by:
        `checkIntegrity` in class `LeafReader`
      Throws:
        `IOException`

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