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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.index.query.functionscore;
import org.apache.lucene.search.Query;
import org.elasticsearch.Version;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.lucene.search.function.ScriptScoreQuery;
import org.elasticsearch.common.xcontent.ConstructingObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.AbstractQueryBuilder;
import org.elasticsearch.index.query.InnerHitContextBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryRewriteContext;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.script.ScoreScript;
import org.elasticsearch.script.Script;
import java.io.IOException;
import java.util.Map;
import java.util.Objects;
import static org.elasticsearch.common.xcontent.ConstructingObjectParser.constructorArg;
import static org.elasticsearch.common.xcontent.ConstructingObjectParser.optionalConstructorArg;
/**
* A query that computes a document score based on the provided script
*/
public class ScriptScoreQueryBuilder extends AbstractQueryBuilder {
public static final String NAME = "script_score";
public static final ParseField QUERY_FIELD = new ParseField("query");
public static final ParseField SCRIPT_FIELD = new ParseField("script");
public static final ParseField MIN_SCORE_FIELD = new ParseField("min_score");
private static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(NAME, false,
args -> {
ScriptScoreQueryBuilder ssQueryBuilder = new ScriptScoreQueryBuilder((QueryBuilder) args[0], (Script) args[1]);
if (args[2] != null) ssQueryBuilder.setMinScore((Float) args[2]);
if (args[3] != null) ssQueryBuilder.boost((Float) args[3]);
if (args[4] != null) ssQueryBuilder.queryName((String) args[4]);
return ssQueryBuilder;
});
static {
PARSER.declareObject(constructorArg(), (p,c) -> parseInnerQueryBuilder(p), QUERY_FIELD);
PARSER.declareObject(constructorArg(), (p,c) -> Script.parse(p), SCRIPT_FIELD);
PARSER.declareFloat(optionalConstructorArg(), MIN_SCORE_FIELD);
PARSER.declareFloat(optionalConstructorArg(), AbstractQueryBuilder.BOOST_FIELD);
PARSER.declareString(optionalConstructorArg(), AbstractQueryBuilder.NAME_FIELD);
}
public static ScriptScoreQueryBuilder fromXContent(XContentParser parser) {
return PARSER.apply(parser, null);
}
private final QueryBuilder query;
private Float minScore = null;
private final Script script;
/**
* Creates a script_score query that executes the provided script function on documents that match a query.
*
* @param query the query that defines which documents the script_score query will be executed on.
* @param script the script to run for computing the query score
*/
public ScriptScoreQueryBuilder(QueryBuilder query, Script script) {
// require the supply of the query, even the explicit supply of "match_all" query
if (query == null) {
throw new IllegalArgumentException("script_score: query must not be null");
}
if (script == null) {
throw new IllegalArgumentException("script_score: script must not be null");
}
this.query = query;
this.script = script;
}
/**
* Read from a stream.
*/
public ScriptScoreQueryBuilder(StreamInput in) throws IOException {
super(in);
query = in.readNamedWriteable(QueryBuilder.class);
if (in.getVersion().onOrAfter(Version.V_7_5_0)) {
script = new Script(in);
} else {
script = in.readNamedWriteable(ScriptScoreFunctionBuilder.class).getScript();
}
minScore = in.readOptionalFloat();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeNamedWriteable(query);
if (out.getVersion().onOrAfter(Version.V_7_5_0)) {
script.writeTo(out);
} else {
out.writeNamedWriteable(new ScriptScoreFunctionBuilder(script));
}
out.writeOptionalFloat(minScore);
}
/**
* Returns the query builder that defines which documents the script_score query will be executed on.
*/
public QueryBuilder query() {
return this.query;
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME);
builder.field(QUERY_FIELD.getPreferredName());
query.toXContent(builder, params);
builder.field(SCRIPT_FIELD.getPreferredName(), script);
if (minScore != null) {
builder.field(MIN_SCORE_FIELD.getPreferredName(), minScore);
}
printBoostAndQueryName(builder);
builder.endObject();
}
public ScriptScoreQueryBuilder setMinScore(float minScore) {
this.minScore = minScore;
return this;
}
public Float getMinScore() {
return this.minScore;
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
protected boolean doEquals(ScriptScoreQueryBuilder other) {
return Objects.equals(this.query, other.query) &&
Objects.equals(this.script, other.script) &&
Objects.equals(this.minScore, other.minScore) ;
}
@Override
protected int doHashCode() {
return Objects.hash(this.query, this.script, this.minScore);
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
ScoreScript.Factory factory = context.compile(script, ScoreScript.CONTEXT);
ScoreScript.LeafFactory scoreScriptFactory = factory.newFactory(script.getParams(), context.lookup());
Query query = this.query.toQuery(context);
return new ScriptScoreQuery(query, script, scoreScriptFactory, minScore,
context.index().getName(), context.getShardId(), context.indexVersionCreated());
}
@Override
protected QueryBuilder doRewrite(QueryRewriteContext queryRewriteContext) throws IOException {
QueryBuilder newQuery = this.query.rewrite(queryRewriteContext);
if (newQuery != query) {
ScriptScoreQueryBuilder newQueryBuilder = new ScriptScoreQueryBuilder(newQuery, script);
if (minScore != null) {
newQueryBuilder.setMinScore(minScore);
}
return newQueryBuilder;
}
return this;
}
@Override
protected void extractInnerHitBuilders(Map innerHits) {
InnerHitContextBuilder.extractInnerHits(query(), innerHits);
}
}