org.elasticsearch.index.query.CustomBoostFactorQueryParser Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.function.BoostScoreFunction;
import org.elasticsearch.common.lucene.search.function.FunctionScoreQuery;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
/**
*
*/
public class CustomBoostFactorQueryParser implements QueryParser {
public static final String NAME = "custom_boost_factor";
@Inject
public CustomBoostFactorQueryParser() {
}
@Override
public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
Query query = null;
boolean queryFound = false;
float boost = 1.0f;
float boostFactor = 1.0f;
String currentFieldName = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if ("query".equals(currentFieldName)) {
query = parseContext.parseInnerQuery();
queryFound = true;
} else {
throw new QueryParsingException(parseContext.index(), "[custom_boost_factor] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("boost_factor".equals(currentFieldName) || "boostFactor".equals(currentFieldName)) {
boostFactor = parser.floatValue();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else {
throw new QueryParsingException(parseContext.index(), "[custom_boost_factor] query does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound) {
throw new QueryParsingException(parseContext.index(), "[constant_factor_query] requires 'query' element");
}
if (query == null) {
return null;
}
FunctionScoreQuery functionScoreQuery = new FunctionScoreQuery(query, new BoostScoreFunction(boostFactor));
functionScoreQuery.setBoost(boost);
return functionScoreQuery;
}
}