org.apache.lucene.search

## Class DisjunctionMaxQuery.DisjunctionMaxWeight

- java.lang.Object
- - org.apache.lucene.search.Weight
  - - org.apache.lucene.search.DisjunctionMaxQuery.DisjunctionMaxWeight

- All Implemented Interfaces:
    SegmentCacheable
  Enclosing class:
    DisjunctionMaxQuery

      protected class DisjunctionMaxQuery.DisjunctionMaxWeight
      extends Weight

  Expert: the Weight for DisjunctionMaxQuery, used to normalize, score and explain these queries.

  NOTE: this API and implementation is subject to change suddenly in the next release.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.search.Weight

      `Weight.DefaultBulkScorer`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected ArrayList<Weight>` | `weights` The Weights for our subqueries, in 1-1 correspondence with disjuncts

    - ### Fields inherited from class org.apache.lucene.search.Weight

      `parentQuery`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DisjunctionMaxWeight(IndexSearcher searcher, boolean needsScores, float boost)` Construct the Weight for this Query searched by searcher.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Explanation` | `explain(LeafReaderContext context, int doc)` Explain the score we computed for doc
    `void` | `extractTerms(Set<Term> terms)` Expert: adds all terms occurring in this query to the terms set.
    `boolean` | `isCacheable(LeafReaderContext ctx)`
    `Matches` | `matches(LeafReaderContext context, int doc)` Returns `Matches` for a specific document, or `null` if the document does not match the parent query A query match that contains no position information (for example, a Point or DocValues query) will return `Matches.MATCH_WITH_NO_TERMS`
    `Scorer` | `scorer(LeafReaderContext context)` Create the scorer used to score our associated DisjunctionMaxQuery

    - ### Methods inherited from class org.apache.lucene.search.Weight

      `bulkScorer, getQuery, scorerSupplier`

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

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

- - ### Field Detail

    - #### weights

          protected final ArrayList<Weight> weights

      The Weights for our subqueries, in 1-1 correspondence with disjuncts

  - ### Constructor Detail

    - #### DisjunctionMaxWeight

          public DisjunctionMaxWeight(IndexSearcher searcher,
                                      boolean needsScores,
                                      float boost)
                               throws IOException

      Construct the Weight for this Query searched by searcher. Recursively construct subquery weights.
      Throws:
        `IOException`

  - ### Method Detail

    - #### extractTerms

          public void extractTerms(Set<Term> terms)

      Description copied from class: `Weight`
      Expert: adds all terms occurring in this query to the terms set. If the `Weight` was created with `needsScores == true` then this method will only extract terms which are used for scoring, otherwise it will extract all terms which are used for matching.
      Specified by:
        `extractTerms` in class `Weight`

    - #### matches

          public Matches matches(LeafReaderContext context,
                                 int doc)
                          throws IOException

      Description copied from class: `Weight`
      Returns `Matches` for a specific document, or `null` if the document does not match the parent query A query match that contains no position information (for example, a Point or DocValues query) will return `Matches.MATCH_WITH_NO_TERMS`
      Overrides:
        `matches` in class `Weight`
      Parameters:
        `context` - the reader's context to create the `Matches` for
        `doc` - the document's id relative to the given context's reader
      Throws:
        `IOException`

    - #### scorer

          public Scorer scorer(LeafReaderContext context)
                        throws IOException

      Create the scorer used to score our associated DisjunctionMaxQuery
      Specified by:
        `scorer` in class `Weight`
      Parameters:
        `context` - the `LeafReaderContext` for which to return the `Scorer`.
      Returns:
        a `Scorer` which scores documents in/out-of order.
      Throws:
        `IOException` - if there is a low-level I/O error

    - #### isCacheable

          public boolean isCacheable(LeafReaderContext ctx)

      Returns:
        `true` if the object can be cached against a given leaf

    - #### explain

          public Explanation explain(LeafReaderContext context,
                                     int doc)
                              throws IOException

      Explain the score we computed for doc
      Specified by:
        `explain` in class `Weight`
      Parameters:
        `context` - the readers context to create the `Explanation` for.
        `doc` - the document's id relative to the given context's reader
      Returns:
        an Explanation for the score
      Throws:
        `IOException` - if an `IOException` occurs

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