1 package org.apache.lucene.search.payloads;
3 import org.apache.lucene.search.Explanation;
5 * Licensed to the Apache Software Foundation (ASF) under one or more
6 * contributor license agreements. See the NOTICE file distributed with
7 * this work for additional information regarding copyright ownership.
8 * The ASF licenses this file to You under the Apache License, Version 2.0
9 * (the "License"); you may not use this file except in compliance with
10 * the License. You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
23 * Calculate the final score as the average score of all payloads seen.
25 * Is thread safe and completely reusable.
28 public class AveragePayloadFunction extends PayloadFunction{
31 public float currentScore(int docId, String field, int start, int end, int numPayloadsSeen, float currentScore, float currentPayloadScore) {
32 return currentPayloadScore + currentScore;
36 public float docScore(int docId, String field, int numPayloadsSeen, float payloadScore) {
37 return numPayloadsSeen > 0 ? (payloadScore / numPayloadsSeen) : 1;
40 public Explanation explain(int doc, int numPayloadsSeen, float payloadScore) {
41 Explanation payloadBoost = new Explanation();
42 float avgPayloadScore = (numPayloadsSeen > 0 ? (payloadScore / numPayloadsSeen) : 1);
43 payloadBoost.setValue(avgPayloadScore);
44 payloadBoost.setDescription("AveragePayloadFunction(...)");
49 public int hashCode() {
52 result = prime * result + this.getClass().hashCode();
57 public boolean equals(Object obj) {
62 if (getClass() != obj.getClass())