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Move score script context from SearchScript to its own class (#30816)
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102 changes: 102 additions & 0 deletions
102
server/src/main/java/org/elasticsearch/script/ScoreScript.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| * 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.script; | ||
|
|
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| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.search.Scorer; | ||
| import org.elasticsearch.index.fielddata.ScriptDocValues; | ||
| import org.elasticsearch.search.lookup.LeafSearchLookup; | ||
| import org.elasticsearch.search.lookup.SearchLookup; | ||
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| import java.io.IOException; | ||
| import java.io.UncheckedIOException; | ||
| import java.util.Map; | ||
| import java.util.function.DoubleSupplier; | ||
|
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| /** | ||
| * A script used for adjusting the score on a per document basis. | ||
| */ | ||
| public abstract class ScoreScript { | ||
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| public static final String[] PARAMETERS = new String[]{}; | ||
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| /** The generic runtime parameters for the script. */ | ||
| private final Map<String, Object> params; | ||
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| /** A leaf lookup for the bound segment this script will operate on. */ | ||
| private final LeafSearchLookup leafLookup; | ||
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| private DoubleSupplier scoreSupplier = () -> 0.0; | ||
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| public ScoreScript(Map<String, Object> params, SearchLookup lookup, LeafReaderContext leafContext) { | ||
| this.params = params; | ||
| this.leafLookup = lookup.getLeafSearchLookup(leafContext); | ||
| } | ||
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| public abstract double execute(); | ||
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| /** Return the parameters for this script. */ | ||
| public Map<String, Object> getParams() { | ||
| return params; | ||
| } | ||
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| /** The doc lookup for the Lucene segment this script was created for. */ | ||
| public final Map<String, ScriptDocValues<?>> getDoc() { | ||
| return leafLookup.doc(); | ||
| } | ||
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| /** Set the current document to run the script on next. */ | ||
| public void setDocument(int docid) { | ||
| leafLookup.setDocument(docid); | ||
| } | ||
|
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| public void setScorer(Scorer scorer) { | ||
| this.scoreSupplier = () -> { | ||
| try { | ||
| return scorer.score(); | ||
| } catch (IOException e) { | ||
| throw new UncheckedIOException(e); | ||
| } | ||
| }; | ||
| } | ||
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| public double get_score() { | ||
| return scoreSupplier.getAsDouble(); | ||
| } | ||
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| /** A factory to construct {@link ScoreScript} instances. */ | ||
| public interface LeafFactory { | ||
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| /** | ||
| * Return {@code true} if the script needs {@code _score} calculated, or {@code false} otherwise. | ||
| */ | ||
| boolean needs_score(); | ||
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| ScoreScript newInstance(LeafReaderContext ctx) throws IOException; | ||
| } | ||
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| /** A factory to construct stateful {@link ScoreScript} factories for a specific index. */ | ||
| public interface Factory { | ||
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| ScoreScript.LeafFactory newFactory(Map<String, Object> params, SearchLookup lookup); | ||
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| } | ||
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| public static final ScriptContext<ScoreScript.Factory> CONTEXT = new ScriptContext<>("score", ScoreScript.Factory.class); | ||
| } |
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