# Uses of Package
org.apache.lucene.search

- Packages that use org.apache.lucene.search
  Package | Description
  --- | ---
  org.apache.lucene.document | The logical representation of a `Document` for indexing and searching.
  org.apache.lucene.index | Code to maintain and access indices.
  org.apache.lucene.search | Code to search indices.
  org.apache.lucene.search.similarities | This package contains the various ranking models that can be used in Lucene.
  org.apache.lucene.search.spans | The calculus of spans.
  org.apache.lucene.util | Some utility classes.

- Classes in org.apache.lucene.search used by org.apache.lucene.document
  Class and Description
  Query The abstract base class for queries.
  SortField Stores information about how to sort documents by terms in an individual field.

- Classes in org.apache.lucene.search used by org.apache.lucene.index
  Class and Description
  DocIdSetIterator This abstract class defines methods to iterate over a set of non-decreasing doc ids.
  Query The abstract base class for queries.
  ReferenceManager Utility class to safely share instances of a certain type across multiple threads, while periodically refreshing them.
  Sort Encapsulates sort criteria for returned hits.

- Classes in org.apache.lucene.search used by org.apache.lucene.search
  Class and Description
  AutomatonQuery A `Query` that will match terms against a finite-state machine.
  BlendedTermQuery A `Query` that blends index statistics across multiple terms.
  BlendedTermQuery.Builder A Builder for `BlendedTermQuery`.
  BlendedTermQuery.RewriteMethod A `BlendedTermQuery.RewriteMethod` defines how queries for individual terms should be merged.
  BooleanClause A clause in a BooleanQuery.
  BooleanClause.Occur Specifies how clauses are to occur in matching documents.
  BooleanQuery A Query that matches documents matching boolean combinations of other queries, e.g.
  BooleanQuery.Builder A builder for boolean queries.
  BoostAttribute Add this `Attribute` to a `TermsEnum` returned by `MultiTermQuery.getTermsEnum(Terms,AttributeSource)` and update the boost on each returned term.
  BulkScorer This class is used to score a range of documents at once, and is returned by `Weight.bulkScorer(org.apache.lucene.index.LeafReaderContext)`.
  CachingCollector Caches all docs, and optionally also scores, coming from a search, and is then able to replay them to another collector.
  CollectionStatistics Contains statistics for a collection (field)
  Collector Expert: Collectors are primarily meant to be used to gather raw results from a search, and implement sorting or custom result filtering, collation, etc.
  CollectorManager A manager of collectors.
  DisiPriorityQueue A priority queue of DocIdSetIterators that orders by current doc ID.
  DisiWrapper Wrapper used in `DisiPriorityQueue`.
  DocIdSet A DocIdSet contains a set of doc ids.
  DocIdSetIterator This abstract class defines methods to iterate over a set of non-decreasing doc ids.
  DoubleValues Per-segment, per-document double values, which can be calculated at search-time
  DoubleValuesSource Base class for producing `DoubleValues` To obtain a `DoubleValues` object for a leaf reader, clients should call `DoubleValuesSource.rewrite(IndexSearcher)` against the top-level searcher, and then call `DoubleValuesSource.getValues(LeafReaderContext, DoubleValues)` on the resulting DoubleValuesSource.
  Explanation Expert: Describes the score computation for document and query.
  FieldComparator Expert: a FieldComparator compares hits so as to determine their sort order when collecting the top results with `TopFieldCollector`.
  FieldComparator.NumericComparator Base FieldComparator class for numeric types
  FieldComparatorSource Provides a `FieldComparator` for custom field sorting.
  FieldDoc Expert: A ScoreDoc which also contains information about how to sort the referenced document.
  FieldValueHitQueue Expert: A hit queue for sorting by hits by terms in more than one field.
  FieldValueHitQueue.Entry Extension of ScoreDoc to also store the `FieldComparator` slot.
  FilterCollector `Collector` delegator.
  FilterScorer A `FilterScorer` contains another `Scorer`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
  FuzzyTermsEnum.LevenshteinAutomataAttribute reuses compiled automata across different segments, because they are independent of the index
  IndexSearcher Implements search over a single IndexReader.
  IndexSearcher.LeafSlice A class holding a subset of the `IndexSearcher`s leaf contexts to be executed within a single thread.
  LeafCollector Collector decouples the score from the collected doc: the score computation is skipped entirely if it's not needed.
  LeafFieldComparator Expert: comparator that gets instantiated on each leaf from a top-level `FieldComparator` instance.
  LongValues Per-segment, per-document long values, which can be calculated at search-time
  LongValuesSource Base class for producing `LongValues` To obtain a `LongValues` object for a leaf reader, clients should call `LongValuesSource.rewrite(IndexSearcher)` against the top-level searcher, and then `LongValuesSource.getValues(LeafReaderContext, DoubleValues)`.
  Matches Reports the positions and optionally offsets of all matching terms in a query for a single document To obtain a `MatchesIterator` for a particular field, call `Matches.getMatches(String)`.
  MatchesIterator An iterator over match positions (and optionally offsets) for a single document and field To iterate over the matches, call `MatchesIterator.next()` until it returns `false`, retrieving positions and/or offsets after each call.
  MaxNonCompetitiveBoostAttribute Add this `Attribute` to a fresh `AttributeSource` before calling `MultiTermQuery.getTermsEnum(Terms,AttributeSource)`.
  MultiCollectorManager.Collectors
  MultiPhraseQuery A generalized version of `PhraseQuery`, with the possibility of adding more than one term at the same position that are treated as a disjunction (OR).
  MultiPhraseQuery.Builder A builder for multi-phrase queries
  MultiTermQuery An abstract `Query` that matches documents containing a subset of terms provided by a `FilteredTermsEnum` enumeration.
  MultiTermQuery.RewriteMethod Abstract class that defines how the query is rewritten.
  PhraseQuery A Query that matches documents containing a particular sequence of terms.
  PhraseQuery.Builder A builder for phrase queries.
  PointInSetQuery.Stream Iterator of encoded point values.
  Query The abstract base class for queries.
  QueryCache A cache for queries.
  QueryCachingPolicy A policy defining which filters should be cached.
  ReferenceManager Utility class to safely share instances of a certain type across multiple threads, while periodically refreshing them.
  ReferenceManager.RefreshListener Use to receive notification when a refresh has finished.
  Rescorer Re-scores the topN results (`TopDocs`) from an original query.
  ScoreDoc Holds one hit in `TopDocs`.
  Scorer Expert: Common scoring functionality for different types of queries.
  Scorer.ChildScorer A child Scorer and its relationship to its parent.
  ScorerSupplier A supplier of `Scorer`.
  ScoringRewrite Base rewrite method that translates each term into a query, and keeps the scores as computed by the query.
  SearcherFactory Factory class used by `SearcherManager` to create new IndexSearchers.
  SearcherLifetimeManager.Pruner See `SearcherLifetimeManager.prune(org.apache.lucene.search.SearcherLifetimeManager.Pruner)`.
  SegmentCacheable Interface defining whether or not an object can be cached against a `LeafReader` Objects that depend only on segment-immutable structures such as Points or postings lists can just return `true` from `SegmentCacheable.isCacheable(LeafReaderContext)` Objects that depend on doc values should return `DocValues.isCacheable(LeafReaderContext, String...)`, which will check to see if the doc values fields have been updated.
  SimpleCollector Base `Collector` implementation that is used to collect all contexts.
  SimpleFieldComparator Base `FieldComparator` implementation that is used for all contexts.
  Sort Encapsulates sort criteria for returned hits.
  SortedNumericSelector.Type Type of selection to perform.
  SortedSetSelector.Type Type of selection to perform.
  SortField Stores information about how to sort documents by terms in an individual field.
  SortField.Type Specifies the type of the terms to be sorted, or special types such as CUSTOM
  TermRangeQuery A Query that matches documents within an range of terms.
  TermStatistics Contains statistics for a specific term
  TimeLimitingCollector.TimerThread Thread used to timeout search requests.
  TopDocs Represents hits returned by `IndexSearcher.search(Query,int)`.
  TopDocsCollector A base class for all collectors that return a `TopDocs` output.
  TopFieldCollector A `Collector` that sorts by `SortField` using `FieldComparator`s.
  TopFieldDocs Represents hits returned by `IndexSearcher.search(Query,int,Sort)`.
  TopScoreDocCollector A `Collector` implementation that collects the top-scoring hits, returning them as a `TopDocs`.
  TopTermsRewrite Base rewrite method for collecting only the top terms via a priority queue.
  TwoPhaseIterator Returned by `Scorer.twoPhaseIterator()` to expose an approximation of a `DocIdSetIterator`.
  Weight Expert: Calculate query weights and build query scorers.

- Classes in org.apache.lucene.search used by org.apache.lucene.search.similarities
  Class and Description
  CollectionStatistics Contains statistics for a collection (field)
  Explanation Expert: Describes the score computation for document and query.
  TermStatistics Contains statistics for a specific term

- Classes in org.apache.lucene.search used by org.apache.lucene.search.spans
  Class and Description
  DocIdSetIterator This abstract class defines methods to iterate over a set of non-decreasing doc ids.
  Explanation Expert: Describes the score computation for document and query.
  IndexSearcher Implements search over a single IndexReader.
  Matches Reports the positions and optionally offsets of all matching terms in a query for a single document To obtain a `MatchesIterator` for a particular field, call `Matches.getMatches(String)`.
  MultiTermQuery An abstract `Query` that matches documents containing a subset of terms provided by a `FilteredTermsEnum` enumeration.
  MultiTermQuery.RewriteMethod Abstract class that defines how the query is rewritten.
  Query The abstract base class for queries.
  Scorer Expert: Common scoring functionality for different types of queries.
  SegmentCacheable Interface defining whether or not an object can be cached against a `LeafReader` Objects that depend only on segment-immutable structures such as Points or postings lists can just return `true` from `SegmentCacheable.isCacheable(LeafReaderContext)` Objects that depend on doc values should return `DocValues.isCacheable(LeafReaderContext, String...)`, which will check to see if the doc values fields have been updated.
  TwoPhaseIterator Returned by `Scorer.twoPhaseIterator()` to expose an approximation of a `DocIdSetIterator`.
  Weight Expert: Calculate query weights and build query scorers.

- Classes in org.apache.lucene.search used by org.apache.lucene.util
  Class and Description
  BooleanClause.Occur Specifies how clauses are to occur in matching documents.
  BooleanQuery.Builder A builder for boolean queries.
  DocIdSet A DocIdSet contains a set of doc ids.
  DocIdSetIterator This abstract class defines methods to iterate over a set of non-decreasing doc ids.
  MultiPhraseQuery.Builder A builder for multi-phrase queries
  Query The abstract base class for queries.

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