org.apache.lucene.queries.payloads.PayloadFunction Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.lucene.queries.payloads;
import org.apache.lucene.queries.spans.Spans;
import org.apache.lucene.search.Explanation;
/**
* An abstract class that defines a way for PayloadScoreQuery instances to transform the cumulative
* effects of payload scores for a document.
*
* @see org.apache.lucene.queries.payloads.PayloadScoreQuery for more information
* @lucene.experimental This class and its derivations are experimental and subject to change
*/
public abstract class PayloadFunction {
/**
* Calculate the score up to this point for this doc and field
*
* @param docId The current doc
* @param field The field
* @param start The start position of the matching Span
* @param end The end position of the matching Span
* @param numPayloadsSeen The number of payloads seen so far
* @param currentScore The current score so far
* @param currentPayloadScore The score for the current payload
* @return The new current Score
* @see Spans
*/
public abstract float currentScore(
int docId,
String field,
int start,
int end,
int numPayloadsSeen,
float currentScore,
float currentPayloadScore);
/**
* Calculate the final score for all the payloads seen so far for this doc/field
*
* @param docId The current doc
* @param field The current field
* @param numPayloadsSeen The total number of payloads seen on this document
* @param payloadScore The raw score for those payloads
* @return The final score for the payloads
*/
public abstract float docScore(int docId, String field, int numPayloadsSeen, float payloadScore);
public Explanation explain(int docId, String field, int numPayloadsSeen, float payloadScore) {
return Explanation.match(
docScore(docId, field, numPayloadsSeen, payloadScore),
getClass().getSimpleName() + ".docScore()");
}
@Override
public abstract int hashCode();
@Override
public abstract boolean equals(Object o);
}