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A Rescorer simply assigns a new "score" to a thing like an ID of an item or user which a Recommender is considering returning as a top recommendation. It may be used to arbitrarily re-rank the results according to application-specific logic before returning recommendations. For example, an application may want to boost the score of items in a certain category just for one request.

A Rescorer can also exclude a thing from consideration entirely by returning true from isFiltered(java.lang.Object).

public interface Rescorer<T> {


thing thing to rescore
originalScore original score
modified score, or java.lang.Double.NaN to indicate that this should be excluded entirely
  double rescore(T thingdouble originalScore);

Returns true to exclude the given thing.

thing the thing to filter
true to exclude, false otherwise
  boolean isFiltered(T thing);
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