org.apache.lucene.codecs

## Class DocValuesConsumer

- java.lang.Object
- - org.apache.lucene.codecs.DocValuesConsumer

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public abstract class DocValuesConsumer
      extends Object
      implements Closeable

  Abstract API that consumes numeric, binary and sorted docvalues. Concrete implementations of this actually do "something" with the docvalues (write it into the index in a specific format).

  The lifecycle is:

  1. DocValuesConsumer is created by `NormsFormat.normsConsumer(SegmentWriteState)`.
  2. `addNumericField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, `addBinaryField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, `addSortedField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, `addSortedSetField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, or `addSortedNumericField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)` are called for each Numeric, Binary, Sorted, SortedSet, or SortedNumeric docvalues field. The API is a "pull" rather than "push", and the implementation is free to iterate over the values multiple times (`Iterable.iterator()`).
  3. After all fields are added, the consumer is `Closeable.close()`d.
  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Constructor Summary

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

  - ### Method Summary

    All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract void` | `addBinaryField(FieldInfo field, DocValuesProducer valuesProducer)` Writes binary docvalues for a field.
    `abstract void` | `addNumericField(FieldInfo field, DocValuesProducer valuesProducer)` Writes numeric docvalues for a field.
    `abstract void` | `addSortedField(FieldInfo field, DocValuesProducer valuesProducer)` Writes pre-sorted binary docvalues for a field.
    `abstract void` | `addSortedNumericField(FieldInfo field, DocValuesProducer valuesProducer)` Writes pre-sorted numeric docvalues for a field
    `abstract void` | `addSortedSetField(FieldInfo field, DocValuesProducer valuesProducer)` Writes pre-sorted set docvalues for a field
    `static boolean` | `isSingleValued(Iterable<Number> docToValueCount)` Helper: returns true if the given docToValue count contains only at most one value
    `void` | `merge(MergeState mergeState)` Merges in the fields from the readers in `mergeState`.
    `void` | `mergeBinaryField(FieldInfo mergeFieldInfo, MergeState mergeState)` Merges the binary docvalues from `MergeState`.
    `void` | `mergeNumericField(FieldInfo mergeFieldInfo, MergeState mergeState)` Merges the numeric docvalues from `MergeState`.
    `void` | `mergeSortedField(FieldInfo fieldInfo, MergeState mergeState)` Merges the sorted docvalues from `toMerge`.
    `void` | `mergeSortedNumericField(FieldInfo mergeFieldInfo, MergeState mergeState)` Merges the sorted docvalues from `toMerge`.
    `void` | `mergeSortedSetField(FieldInfo mergeFieldInfo, MergeState mergeState)` Merges the sortedset docvalues from `toMerge`.
    `static Iterable<Number>` | `singletonView(Iterable<Number> docToValueCount, Iterable<Number> values, Number missingValue)` Helper: returns single-valued view, using `missingValue` when count is zero

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

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

    - ### Methods inherited from interface java.io.Closeable

      `close`

- - ### Constructor Detail

    - #### DocValuesConsumer

          protected DocValuesConsumer()

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

  - ### Method Detail

    - #### addNumericField

          public abstract void addNumericField(FieldInfo field,
                                               DocValuesProducer valuesProducer)
                                        throws IOException

      Writes numeric docvalues for a field.
      Parameters:
        `field` - field information
        `valuesProducer` - Numeric values to write.
      Throws:
        `IOException` - if an I/O error occurred.

    - #### addBinaryField

          public abstract void addBinaryField(FieldInfo field,
                                              DocValuesProducer valuesProducer)
                                       throws IOException

      Writes binary docvalues for a field.
      Parameters:
        `field` - field information
        `valuesProducer` - Binary values to write.
      Throws:
        `IOException` - if an I/O error occurred.

    - #### addSortedField

          public abstract void addSortedField(FieldInfo field,
                                              DocValuesProducer valuesProducer)
                                       throws IOException

      Writes pre-sorted binary docvalues for a field.
      Parameters:
        `field` - field information
        `valuesProducer` - produces the values and ordinals to write
      Throws:
        `IOException` - if an I/O error occurred.

    - #### addSortedNumericField

          public abstract void addSortedNumericField(FieldInfo field,
                                                     DocValuesProducer valuesProducer)
                                              throws IOException

      Writes pre-sorted numeric docvalues for a field
      Parameters:
        `field` - field information
        `valuesProducer` - produces the values to write
      Throws:
        `IOException` - if an I/O error occurred.

    - #### addSortedSetField

          public abstract void addSortedSetField(FieldInfo field,
                                                 DocValuesProducer valuesProducer)
                                          throws IOException

      Writes pre-sorted set docvalues for a field
      Parameters:
        `field` - field information
        `valuesProducer` - produces the values to write
      Throws:
        `IOException` - if an I/O error occurred.

    - #### merge

          public void merge(MergeState mergeState)
                     throws IOException

      Merges in the fields from the readers in `mergeState`. The default implementation calls `mergeNumericField(org.apache.lucene.index.FieldInfo, org.apache.lucene.index.MergeState)`, `mergeBinaryField(org.apache.lucene.index.FieldInfo, org.apache.lucene.index.MergeState)`, `mergeSortedField(org.apache.lucene.index.FieldInfo, org.apache.lucene.index.MergeState)`, `mergeSortedSetField(org.apache.lucene.index.FieldInfo, org.apache.lucene.index.MergeState)`, or `mergeSortedNumericField(org.apache.lucene.index.FieldInfo, org.apache.lucene.index.MergeState)` for each field, depending on its type. Implementations can override this method for more sophisticated merging (bulk-byte copying, etc).
      Throws:
        `IOException`

    - #### mergeNumericField

          public void mergeNumericField(FieldInfo mergeFieldInfo,
                                        MergeState mergeState)
                                 throws IOException

      Merges the numeric docvalues from `MergeState`.

      The default implementation calls `addNumericField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, passing a DocValuesProducer that merges and filters deleted documents on the fly.

      Throws:
        `IOException`

    - #### mergeBinaryField

          public void mergeBinaryField(FieldInfo mergeFieldInfo,
                                       MergeState mergeState)
                                throws IOException

      Merges the binary docvalues from `MergeState`.

      The default implementation calls `addBinaryField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, passing a DocValuesProducer that merges and filters deleted documents on the fly.

      Throws:
        `IOException`

    - #### mergeSortedNumericField

          public void mergeSortedNumericField(FieldInfo mergeFieldInfo,
                                              MergeState mergeState)
                                       throws IOException

      Merges the sorted docvalues from `toMerge`.

      The default implementation calls `addSortedNumericField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, passing iterables that filter deleted documents.

      Throws:
        `IOException`

    - #### mergeSortedField

          public void mergeSortedField(FieldInfo fieldInfo,
                                       MergeState mergeState)
                                throws IOException

      Merges the sorted docvalues from `toMerge`.

      The default implementation calls `addSortedField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, passing an Iterable that merges ordinals and values and filters deleted documents .

      Throws:
        `IOException`

    - #### mergeSortedSetField

          public void mergeSortedSetField(FieldInfo mergeFieldInfo,
                                          MergeState mergeState)
                                   throws IOException

      Merges the sortedset docvalues from `toMerge`.

      The default implementation calls `addSortedSetField(org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.DocValuesProducer)`, passing an Iterable that merges ordinals and values and filters deleted documents .

      Throws:
        `IOException`

    - #### isSingleValued

          public static boolean isSingleValued(Iterable<Number> docToValueCount)

      Helper: returns true if the given docToValue count contains only at most one value

    - #### singletonView

          public static Iterable<Number> singletonView(Iterable<Number> docToValueCount,
                                                       Iterable<Number> values,
                                                       Number missingValue)

      Helper: returns single-valued view, using `missingValue` when count is zero

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