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## org.apache.lucene.search.similarities
Class Similarity.SimWeight

    java.lang.Object
      org.apache.lucene.search.similarities.Similarity.SimWeight

Direct Known Subclasses:
  BasicStats

Enclosing class:
  Similarity

    public abstract static class Similarity.SimWeight

extends Object

Stores the weight for a query across the indexed collection. This abstract implementation is empty; descendants of `Similarity` should subclass `SimWeight` and define the statistics they require in the subclass. Examples include idf, average field length, etc.

Constructor Summary
`Similarity.SimWeight()` Sole constructor.

Method Summary
`abstract float` | `getValueForNormalization()` The value for normalization of contained query clauses (e.g.
`abstract void` | `normalize(float queryNorm, float topLevelBoost)` Assigns the query normalization factor and boost from parent queries to this.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Similarity.SimWeight

    public Similarity.SimWeight()

  Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Detail

### getValueForNormalization

    public abstract float getValueForNormalization()

  The value for normalization of contained query clauses (e.g. sum of squared weights).

  NOTE: a Similarity implementation might not use any query normalization at all, its not required. However, if it wants to participate in query normalization, it can return a value here.

### normalize

    public abstract void normalize(float queryNorm,
                                   float topLevelBoost)

  Assigns the query normalization factor and boost from parent queries to this.

  NOTE: a Similarity implementation might not use this normalized value at all, its not required. However, its usually a good idea to at least incorporate the topLevelBoost (e.g. from an outer BooleanQuery) into its score.

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