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/*
* 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.functionscore;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.lucene.search.XConstantScoreQuery;
import org.elasticsearch.common.lucene.search.function.CombineFunction;
import org.elasticsearch.common.lucene.search.function.FiltersFunctionScoreQuery;
import org.elasticsearch.common.lucene.search.function.FunctionScoreQuery;
import org.elasticsearch.common.lucene.search.function.ScoreFunction;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.index.query.QueryParser;
import org.elasticsearch.index.query.QueryParsingException;
import java.io.IOException;
import java.util.ArrayList;
/**
*
*/
public class FunctionScoreQueryParser implements QueryParser {
public static final String NAME = "function_score";
ScoreFunctionParserMapper funtionParserMapper;
@Inject
public FunctionScoreQueryParser(ScoreFunctionParserMapper funtionParserMapper) {
this.funtionParserMapper = funtionParserMapper;
}
@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;
float boost = 1.0f;
FiltersFunctionScoreQuery.ScoreMode scoreMode = FiltersFunctionScoreQuery.ScoreMode.Multiply;
ArrayList filterFunctions = new ArrayList();
float maxBoost = Float.MAX_VALUE;
String currentFieldName = null;
XContentParser.Token token;
CombineFunction combineFunction = CombineFunction.MULT;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if ("query".equals(currentFieldName)) {
query = parseContext.parseInnerQuery();
} else if ("filter".equals(currentFieldName)) {
query = new XConstantScoreQuery(parseContext.parseInnerFilter());
} else if ("score_mode".equals(currentFieldName) || "scoreMode".equals(currentFieldName)) {
scoreMode = parseScoreMode(parseContext, parser);
} else if ("boost_mode".equals(currentFieldName) || "boostMode".equals(currentFieldName)) {
combineFunction = parseBoostMode(parseContext, parser);
} else if ("max_boost".equals(currentFieldName) || "maxBoost".equals(currentFieldName)) {
maxBoost = parser.floatValue();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("functions".equals(currentFieldName)) {
currentFieldName = parseFiltersAndFunctions(parseContext, parser, filterFunctions, currentFieldName);
} else {
// we tru to parse a score function. If there is no score
// function for the current field name,
// funtionParserMapper.get() will throw an Exception.
filterFunctions.add(new FiltersFunctionScoreQuery.FilterFunction(null, funtionParserMapper.get(parseContext.index(),
currentFieldName).parse(parseContext, parser)));
}
}
if (query == null) {
query = Queries.newMatchAllQuery();
}
// if all filter elements returned null, just use the query
if (filterFunctions.isEmpty()) {
return query;
}
// handle cases where only one score function and no filter was
// provided. In this case we create a FunctionScoreQuery.
if (filterFunctions.size() == 1 && filterFunctions.get(0).filter == null) {
FunctionScoreQuery theQuery = new FunctionScoreQuery(query, filterFunctions.get(0).function);
if (combineFunction != null) {
theQuery.setCombineFunction(combineFunction);
}
theQuery.setBoost(boost);
theQuery.setMaxBoost(maxBoost);
return theQuery;
// in all other cases we create a FiltersFunctionScoreQuery.
} else {
FiltersFunctionScoreQuery functionScoreQuery = new FiltersFunctionScoreQuery(query, scoreMode,
filterFunctions.toArray(new FiltersFunctionScoreQuery.FilterFunction[filterFunctions.size()]), maxBoost);
if (combineFunction != null) {
functionScoreQuery.setCombineFunction(combineFunction);
}
functionScoreQuery.setBoost(boost);
return functionScoreQuery;
}
}
private String parseFiltersAndFunctions(QueryParseContext parseContext, XContentParser parser,
ArrayList filterFunctions, String currentFieldName) throws IOException {
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
Filter filter = null;
ScoreFunction scoreFunction = null;
if (token != XContentParser.Token.START_OBJECT) {
throw new QueryParsingException(parseContext.index(), NAME + ": malformed query, expected a "
+ XContentParser.Token.START_OBJECT + " while parsing functions but got a " + token);
} else {
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else {
if ("filter".equals(currentFieldName)) {
filter = parseContext.parseInnerFilter();
} else {
// do not need to check null here,
// funtionParserMapper throws exception if parser
// non-existent
ScoreFunctionParser functionParser = funtionParserMapper.get(parseContext.index(), currentFieldName);
scoreFunction = functionParser.parse(parseContext, parser);
}
}
}
}
if (filter == null) {
filter = Queries.MATCH_ALL_FILTER;
}
filterFunctions.add(new FiltersFunctionScoreQuery.FilterFunction(filter, scoreFunction));
}
return currentFieldName;
}
private FiltersFunctionScoreQuery.ScoreMode parseScoreMode(QueryParseContext parseContext, XContentParser parser) throws IOException {
String scoreMode = parser.text();
if ("avg".equals(scoreMode)) {
return FiltersFunctionScoreQuery.ScoreMode.Avg;
} else if ("max".equals(scoreMode)) {
return FiltersFunctionScoreQuery.ScoreMode.Max;
} else if ("min".equals(scoreMode)) {
return FiltersFunctionScoreQuery.ScoreMode.Min;
} else if ("sum".equals(scoreMode)) {
return FiltersFunctionScoreQuery.ScoreMode.Sum;
} else if ("multiply".equals(scoreMode)) {
return FiltersFunctionScoreQuery.ScoreMode.Multiply;
} else if ("first".equals(scoreMode)) {
return FiltersFunctionScoreQuery.ScoreMode.First;
} else {
throw new QueryParsingException(parseContext.index(), NAME + " illegal score_mode [" + scoreMode + "]");
}
}
private CombineFunction parseBoostMode(QueryParseContext parseContext, XContentParser parser) throws IOException {
String boostMode = parser.text();
for (CombineFunction cf : CombineFunction.values()) {
if (cf.getName().equals(boostMode)) {
return cf;
}
}
throw new QueryParsingException(parseContext.index(), NAME + " illegal boost_mode [" + boostMode + "]");
}
}
