Compares two ScoreDoc objects and returns a result indicating their sort order.

Returns the type of sort. Should return

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SortField.SCORE

,

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SortField.DOC

,

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SortField.STRING

,

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SortField.INTEGER

,

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SortField.FLOAT

or

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SortField.CUSTOM

. It is not valid to return

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SortField.AUTO

. This is used by multisearchers to determine how to collate results from their searchers.

Returns the value used to sort the given document. The object returned must implement the java.io.Serializable interface. This is used by multisearchers to determine how to collate results from their searchers.