org.apache.lucene.index

## Class FilterLeafReader.FilterTerms

- java.lang.Object
- - org.apache.lucene.index.Terms
  - - org.apache.lucene.index.FilterLeafReader.FilterTerms

- Direct Known Subclasses:
    ExitableDirectoryReader.ExitableTerms
  Enclosing class:
    FilterLeafReader

      public abstract static class FilterLeafReader.FilterTerms
      extends Terms

  Base class for filtering `Terms` implementations.

  NOTE: If the order of terms and documents is not changed, and if these terms are going to be intersected with automata, you could consider overriding `Terms.intersect(org.apache.lucene.util.automaton.CompiledAutomaton, org.apache.lucene.util.BytesRef)` for better performance.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Terms` | `in` The underlying Terms instance.

    - ### Fields inherited from class org.apache.lucene.index.Terms

      `EMPTY_ARRAY`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FilterTerms(Terms in)` Creates a new FilterTerms

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getDocCount()` Returns the number of documents that have at least one term for this field.
    `Object` | `getStats()` Expert: returns additional information about this Terms instance for debugging purposes.
    `long` | `getSumDocFreq()` Returns the sum of `TermsEnum.docFreq()` for all terms in this field.
    `long` | `getSumTotalTermFreq()` Returns the sum of `TermsEnum.totalTermFreq()` for all terms in this field.
    `boolean` | `hasFreqs()` Returns true if documents in this field store per-document term frequency (`PostingsEnum.freq()`).
    `boolean` | `hasOffsets()` Returns true if documents in this field store offsets.
    `boolean` | `hasPayloads()` Returns true if documents in this field store payloads.
    `boolean` | `hasPositions()` Returns true if documents in this field store positions.
    `TermsEnum` | `iterator()` Returns an iterator that will step through all terms.
    `long` | `size()` Returns the number of terms for this field, or -1 if this measure isn't stored by the codec.

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

      `getMax, getMin, intersect`

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

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

- - ### Field Detail

    - #### in

          protected final Terms in

      The underlying Terms instance.

  - ### Constructor Detail

    - #### FilterTerms

          public FilterTerms(Terms in)

      Creates a new FilterTerms
      Parameters:
        `in` - the underlying Terms instance.

  - ### Method Detail

    - #### iterator

          public TermsEnum iterator()
                             throws IOException

      Description copied from class: `Terms`
      Returns an iterator that will step through all terms. This method will not return null.
      Specified by:
        `iterator` in class `Terms`
      Throws:
        `IOException`

    - #### size

          public long size()
                    throws IOException

      Description copied from class: `Terms`
      Returns the number of terms for this field, or -1 if this measure isn't stored by the codec. Note that, just like other term measures, this measure does not take deleted documents into account.
      Specified by:
        `size` in class `Terms`
      Throws:
        `IOException`

    - #### getSumTotalTermFreq

          public long getSumTotalTermFreq()
                                   throws IOException

      Description copied from class: `Terms`
      Returns the sum of `TermsEnum.totalTermFreq()` for all terms in this field. Note that, just like other term measures, this measure does not take deleted documents into account.
      Specified by:
        `getSumTotalTermFreq` in class `Terms`
      Throws:
        `IOException`

    - #### getSumDocFreq

          public long getSumDocFreq()
                             throws IOException

      Description copied from class: `Terms`
      Returns the sum of `TermsEnum.docFreq()` for all terms in this field. Note that, just like other term measures, this measure does not take deleted documents into account.
      Specified by:
        `getSumDocFreq` in class `Terms`
      Throws:
        `IOException`

    - #### getDocCount

          public int getDocCount()
                          throws IOException

      Description copied from class: `Terms`
      Returns the number of documents that have at least one term for this field. Note that, just like other term measures, this measure does not take deleted documents into account.
      Specified by:
        `getDocCount` in class `Terms`
      Throws:
        `IOException`

    - #### hasFreqs

          public boolean hasFreqs()

      Description copied from class: `Terms`
      Returns true if documents in this field store per-document term frequency (`PostingsEnum.freq()`).
      Specified by:
        `hasFreqs` in class `Terms`

    - #### hasOffsets

          public boolean hasOffsets()

      Description copied from class: `Terms`
      Returns true if documents in this field store offsets.
      Specified by:
        `hasOffsets` in class `Terms`

    - #### hasPositions

          public boolean hasPositions()

      Description copied from class: `Terms`
      Returns true if documents in this field store positions.
      Specified by:
        `hasPositions` in class `Terms`

    - #### hasPayloads

          public boolean hasPayloads()

      Description copied from class: `Terms`
      Returns true if documents in this field store payloads.
      Specified by:
        `hasPayloads` in class `Terms`

    - #### getStats

          public Object getStats()
                          throws IOException

      Description copied from class: `Terms`
      Expert: returns additional information about this Terms instance for debugging purposes.
      Overrides:
        `getStats` in class `Terms`
      Throws:
        `IOException`

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