| Package | Description | 
|---|---|
| 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. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | BasicStatsStores all statistics commonly used ranking methods. | 
| static class  | LMSimilarity.LMStatsStores the collection distribution of the current term. | 
| Modifier and Type | Method and Description | 
|---|---|
| Similarity.SimWeight | BM25Similarity. computeWeight(float boost,
             CollectionStatistics collectionStats,
             TermStatistics... termStats) | 
| Similarity.SimWeight | BooleanSimilarity. computeWeight(float boost,
             CollectionStatistics collectionStats,
             TermStatistics... termStats) | 
| Similarity.SimWeight | PerFieldSimilarityWrapper. computeWeight(float boost,
             CollectionStatistics collectionStats,
             TermStatistics... termStats) | 
| abstract Similarity.SimWeight | Similarity. computeWeight(float boost,
             CollectionStatistics collectionStats,
             TermStatistics... termStats)Compute any collection-level weight (e.g. | 
| Similarity.SimWeight | SimilarityBase. computeWeight(float boost,
             CollectionStatistics collectionStats,
             TermStatistics... termStats) | 
| Similarity.SimWeight | TFIDFSimilarity. computeWeight(float boost,
             CollectionStatistics collectionStats,
             TermStatistics... termStats) | 
| Similarity.SimWeight | MultiSimilarity. computeWeight(float boost,
             CollectionStatistics collectionStats,
             TermStatistics... termStats) | 
| Modifier and Type | Method and Description | 
|---|---|
| Similarity.SimScorer | BM25Similarity. simScorer(Similarity.SimWeight stats,
         LeafReaderContext context) | 
| Similarity.SimScorer | BooleanSimilarity. simScorer(Similarity.SimWeight weight,
         LeafReaderContext context) | 
| Similarity.SimScorer | PerFieldSimilarityWrapper. simScorer(Similarity.SimWeight weight,
         LeafReaderContext context) | 
| abstract Similarity.SimScorer | Similarity. simScorer(Similarity.SimWeight weight,
         LeafReaderContext context)Creates a new  Similarity.SimScorerto score matching documents from a segment of the inverted index. | 
| Similarity.SimScorer | SimilarityBase. simScorer(Similarity.SimWeight stats,
         LeafReaderContext context) | 
| Similarity.SimScorer | TFIDFSimilarity. simScorer(Similarity.SimWeight stats,
         LeafReaderContext context) | 
| Similarity.SimScorer | MultiSimilarity. simScorer(Similarity.SimWeight stats,
         LeafReaderContext context) | 
| Modifier and Type | Field and Description | 
|---|---|
| protected Similarity.SimWeight | SpanWeight. simWeight | 
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