Class Weight

Expert: Calculate query weights and build query scorers.

The purpose of Weight is to ensure searching does not modify a Query, so that a Query instance can be reused.
Searcher dependent state of the query should reside in the Weight.
IndexReader dependent state should reside in the Scorer(IndexReader, Boolean, Boolean).

A Weight is used in the following way:

System.Object

Weight

public abstract class Weight : object

Name	Description
Query	The query that this concerns.
Value	The weight for this query.

Name	Description
Explain(IndexReader, Int32)	An explanation of the score computation for the named document.
GetScoresDocsOutOfOrder()	Returns true iff this implementation scores docs only out of order. This method is used in conjunction with Collector's AcceptsDocsOutOfOrder and Scorer(IndexReader, Boolean, Boolean) to create a matching Scorer(IndexReader, Boolean, Boolean) instance for a given Collector, or vice versa. NOTE: the default implementation returns `false`, i.e. the `Scorer` scores documents in-order.
GetSumOfSquaredWeights()	The sum of squared weights of contained query clauses.
Normalize(Single)	Assigns the query normalization factor to this.
Scorer(IndexReader, Boolean, Boolean)	Returns a Scorer(IndexReader, Boolean, Boolean) which scores documents in/out-of order according to `scoreDocsInOrder`. NOTE: even if `scoreDocsInOrder` is false, it is recommended to check whether the returned `Scorer` indeed scores documents out of order (i.e., call GetScoresDocsOutOfOrder()), as some `Scorer` implementations will always return documents in-order. NOTE: null can be returned if no documents will be scored by this query.