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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.rescore;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TopDocs;
import java.io.IOException;
/**
* A query rescorer interface used to re-rank the Top-K results of a previously
* executed search.
*
* Subclasses should borrow heavily from {@link QueryRescorer} because it is
* fairly well behaved and documents that tradeoffs that it is making. There
* is also an {@code ExampleRescorer} that is worth looking at.
*/
public interface Rescorer {
/**
* Modifies the result of the previously executed search ({@link TopDocs})
* in place based on the given {@link RescoreContext}.
*
* @param topDocs the result of the previously executed search
* @param searcher the searcher used for this search. This will never be null
.
* @param rescoreContext the {@link RescoreContext}. This will never be null
* @throws IOException if an {@link IOException} occurs during rescoring
*/
TopDocs rescore(TopDocs topDocs, IndexSearcher searcher, RescoreContext rescoreContext) throws IOException;
/**
* Executes an {@link Explanation} phase on the rescorer.
*
* @param topLevelDocId the global / top-level document ID to explain
* @param searcher the searcher used for this search. This will never be null
.
* @param rescoreContext context for this rescorer
* @param sourceExplanation explanation of the source of the documents being fed into this rescore
* @return the explain for the given top level document ID.
* @throws IOException if an {@link IOException} occurs
*/
Explanation explain(int topLevelDocId, IndexSearcher searcher, RescoreContext rescoreContext,
Explanation sourceExplanation) throws IOException;
}