# Package org.apache.lucene.search.uhighlight

package org.apache.lucene.search.uhighlight
The UnifiedHighlighter -- a flexible highlighter that can get offsets from postings, term vectors, or analysis.

See Also:
  - `UnifiedHighlighter`

- Class
  Description
  AnalysisOffsetStrategy
  Provides a base class for analysis based offset strategies to extend from.
  CharArrayMatcher
  Matches a character array
  CustomSeparatorBreakIterator
  A `BreakIterator` that breaks the text whenever a certain separator, provided as a constructor argument, is found.
  DefaultPassageFormatter
  Creates a formatted snippet from the top passages.
  FieldHighlighter
  Internal highlighter abstraction that operates on a per field basis.
  FieldOffsetStrategy
  Ultimately returns an `OffsetsEnum` yielding potentially highlightable words in the text.
  LabelledCharArrayMatcher
  Associates a label with a CharArrayMatcher to distinguish different sources for terms in highlighting
  LengthGoalBreakIterator
  Wraps another `BreakIterator` to skip past breaks that would result in passages that are too short.
  MemoryIndexOffsetStrategy
  Uses an `Analyzer` on content to get offsets and then populates a `MemoryIndex`.
  MultiFieldsOffsetStrategy
  FieldOffsetStrategy that combines offsets from multiple fields.
  NoOpOffsetStrategy
  Never returns offsets.
  OffsetsEnum
  An enumeration/iterator of a term and its offsets for use by `FieldHighlighter`.
  OffsetsEnum.MultiOffsetsEnum
  A view over several OffsetsEnum instances, merging them in-place
  OffsetsEnum.OfMatchesIterator
  Based on a `MatchesIterator`; does not look at submatches.
  OffsetsEnum.OfMatchesIteratorWithSubs
  Based on a `MatchesIterator` with submatches.
  OffsetsEnum.OfPostings
  Based on a `PostingsEnum` -- the typical/standard OE impl.
  OverlaySingleDocTermsLeafReader
  Overlays a 2nd LeafReader for the terms of one field, otherwise the primary reader is consulted.
  Passage
  Represents a passage (typically a sentence of the document).
  PassageFormatter
  Creates a formatted snippet from the top passages.
  PassageScorer
  Ranks passages found by `UnifiedHighlighter`.
  PhraseHelper
  Helps the `FieldOffsetStrategy` with position sensitive queries (e.g.
  PostingsOffsetStrategy
  Uses offsets in postings -- `IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS`.
  PostingsWithTermVectorsOffsetStrategy
  Like `PostingsOffsetStrategy` but also uses term vectors (only terms needed) for multi-term queries.
  SplittingBreakIterator
  Virtually slices the text on both sides of every occurrence of the specified character.
  TermVectorOffsetStrategy
  Uses term vectors that contain offsets.
  TokenStreamOffsetStrategy
  Analyzes the text, producing a single `OffsetsEnum` wrapping the `TokenStream` filtered to terms in the query, including wildcards.
  UHComponents
  A parameter object to hold the components a `FieldOffsetStrategy` needs.
  UnifiedHighlighter
  A Highlighter that can get offsets from either postings (`IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS`), term vectors (`FieldType.setStoreTermVectorOffsets(boolean)`), or via re-analyzing text.
  UnifiedHighlighter.Builder
  Builder for UnifiedHighlighter.
  UnifiedHighlighter.HighlightFlag
  Flags for controlling highlighting behavior.
  UnifiedHighlighter.LimitedStoredFieldVisitor
  Fetches stored fields for highlighting.
  UnifiedHighlighter.OffsetSource
  Source of term offsets; essential for highlighting.
  WholeBreakIterator
  Just produces one single fragment for the entire text