org.apache.lucene.search.payloads
Class PayloadFunction

java.lang.Object
  extended by org.apache.lucene.search.payloads.PayloadFunction
All Implemented Interfaces:
Serializable
Direct Known Subclasses:
AveragePayloadFunction, MaxPayloadFunction, MinPayloadFunction

public abstract class PayloadFunction
extends Object
implements Serializable

An abstract class that defines a way for Payload*Query instances to transform the cumulative effects of payload scores for a document.

See Also:
for more information

This class and its derivations are experimental and subject to change, Serialized Form


Constructor Summary
PayloadFunction()
           
 
Method Summary
abstract  float currentScore(int docId, String field, int start, int end, int numPayloadsSeen, float currentScore, float currentPayloadScore)
          Calculate the score up to this point for this doc and field
abstract  float docScore(int docId, String field, int numPayloadsSeen, float payloadScore)
          Calculate the final score for all the payloads seen so far for this doc/field
abstract  boolean equals(Object o)
           
abstract  int hashCode()
           
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PayloadFunction

public PayloadFunction()
Method Detail

currentScore

public abstract float currentScore(int docId,
                                   String field,
                                   int start,
                                   int end,
                                   int numPayloadsSeen,
                                   float currentScore,
                                   float currentPayloadScore)
Calculate the score up to this point for this doc and field

Parameters:
docId - The current doc
field - The field
start - The start position of the matching Span
end - The end position of the matching Span
numPayloadsSeen - The number of payloads seen so far
currentScore - The current score so far
currentPayloadScore - The score for the current payload
Returns:
The new current Score
See Also:
Spans

docScore

public abstract float docScore(int docId,
                               String field,
                               int numPayloadsSeen,
                               float payloadScore)
Calculate the final score for all the payloads seen so far for this doc/field

Parameters:
docId - The current doc
field - The current field
numPayloadsSeen - The total number of payloads seen on this document
payloadScore - The raw score for those payloads
Returns:
The final score for the payloads

hashCode

public abstract int hashCode()
Overrides:
hashCode in class Object

equals

public abstract boolean equals(Object o)
Overrides:
equals in class Object


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