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Elasticsearch - Open Source, Distributed, RESTful Search Engine
/*
* 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;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.join.ScoreMode;
import org.apache.lucene.search.join.ToParentBlockJoinQuery;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.support.InnerHitsQueryParserHelper;
import org.elasticsearch.index.query.support.NestedInnerQueryParseSupport;
import org.elasticsearch.search.fetch.innerhits.InnerHitsContext;
import org.elasticsearch.search.fetch.innerhits.InnerHitsSubSearchContext;
import java.io.IOException;
public class NestedQueryParser implements QueryParser {
public static final String NAME = "nested";
private static final ParseField FILTER_FIELD = new ParseField("filter").withAllDeprecated("query");
private final InnerHitsQueryParserHelper innerHitsQueryParserHelper;
@Inject
public NestedQueryParser(InnerHitsQueryParserHelper innerHitsQueryParserHelper) {
this.innerHitsQueryParserHelper = innerHitsQueryParserHelper;
}
@Override
public String[] names() {
return new String[]{NAME};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
final ToBlockJoinQueryBuilder builder = new ToBlockJoinQueryBuilder(parseContext);
float boost = 1.0f;
ScoreMode scoreMode = ScoreMode.Avg;
String queryName = null;
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)) {
builder.query();
} else if (parseContext.parseFieldMatcher().match(currentFieldName, FILTER_FIELD)) {
builder.filter();
} else if ("inner_hits".equals(currentFieldName)) {
builder.setInnerHits(innerHitsQueryParserHelper.parse(parseContext));
} else {
throw new QueryParsingException(parseContext, "[nested] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("path".equals(currentFieldName)) {
builder.setPath(parser.text());
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("score_mode".equals(currentFieldName) || "scoreMode".equals(currentFieldName)) {
String sScoreMode = parser.text();
if ("avg".equals(sScoreMode)) {
scoreMode = ScoreMode.Avg;
} else if ("min".equals(sScoreMode)) {
scoreMode = ScoreMode.Min;
} else if ("max".equals(sScoreMode)) {
scoreMode = ScoreMode.Max;
} else if ("total".equals(sScoreMode) || "sum".equals(sScoreMode)) {
scoreMode = ScoreMode.Total;
} else if ("none".equals(sScoreMode)) {
scoreMode = ScoreMode.None;
} else {
throw new QueryParsingException(parseContext, "illegal score_mode for nested query [" + sScoreMode + "]");
}
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new QueryParsingException(parseContext, "[nested] query does not support [" + currentFieldName + "]");
}
}
}
builder.setScoreMode(scoreMode);
ToParentBlockJoinQuery joinQuery = builder.build();
if (joinQuery != null) {
joinQuery.setBoost(boost);
if (queryName != null) {
parseContext.addNamedQuery(queryName, joinQuery);
}
}
return joinQuery;
}
public static class ToBlockJoinQueryBuilder extends NestedInnerQueryParseSupport {
private ScoreMode scoreMode;
private InnerHitsSubSearchContext innerHits;
public ToBlockJoinQueryBuilder(QueryParseContext parseContext) throws IOException {
super(parseContext);
}
public void setScoreMode(ScoreMode scoreMode) {
this.scoreMode = scoreMode;
}
public void setInnerHits(InnerHitsSubSearchContext innerHits) {
this.innerHits = innerHits;
}
@Nullable
public ToParentBlockJoinQuery build() throws IOException {
Query innerQuery;
if (queryFound) {
innerQuery = getInnerQuery();
} else if (filterFound) {
Query innerFilter = getInnerFilter();
if (innerFilter != null) {
innerQuery = new ConstantScoreQuery(getInnerFilter());
} else {
innerQuery = null;
}
} else {
throw new QueryParsingException(parseContext, "[nested] requires either 'query' or 'filter' field");
}
if (innerHits != null) {
ParsedQuery parsedQuery = new ParsedQuery(innerQuery, parseContext.copyNamedQueries());
InnerHitsContext.NestedInnerHits nestedInnerHits = new InnerHitsContext.NestedInnerHits(innerHits.getSubSearchContext(), parsedQuery, null, getParentObjectMapper(), nestedObjectMapper);
String name = innerHits.getName() != null ? innerHits.getName() : path;
parseContext.addInnerHits(name, nestedInnerHits);
}
if (innerQuery != null) {
return new ToParentBlockJoinQuery(Queries.filtered(innerQuery, childFilter), parentFilter, scoreMode);
} else {
return null;
}
}
}
}