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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;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.join.ScoreMode;
import org.apache.lucene.search.join.ToParentBlockJoinQuery;
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.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import org.elasticsearch.index.query.support.InnerHitsQueryParserHelper;
import java.io.IOException;
public class NestedFilterParser implements FilterParser {
public static final String NAME = "nested";
private final InnerHitsQueryParserHelper innerHitsQueryParserHelper;
@Inject
public NestedFilterParser(InnerHitsQueryParserHelper innerHitsQueryParserHelper) {
this.innerHitsQueryParserHelper = innerHitsQueryParserHelper;
}
@Override
public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
final NestedQueryParser.ToBlockJoinQueryBuilder builder = new NestedQueryParser.ToBlockJoinQueryBuilder(parseContext);
float boost = 1.0f;
boolean join = true;
boolean cache = false;
CacheKeyFilter.Key cacheKey = null;
String filterName = 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 ("filter".equals(currentFieldName)) {
builder.filter();
} else if ("inner_hits".equals(currentFieldName)) {
builder.setInnerHits(innerHitsQueryParserHelper.parse(parseContext));
} else {
throw new QueryParsingException(parseContext.index(), "[nested] filter does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("join".equals(currentFieldName)) {
join = parser.booleanValue();
} else if ("path".equals(currentFieldName)) {
builder.setPath(parser.text());
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else if ("_cache".equals(currentFieldName)) {
cache = parser.booleanValue();
} else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
cacheKey = new CacheKeyFilter.Key(parser.text());
} else {
throw new QueryParsingException(parseContext.index(), "[nested] filter does not support [" + currentFieldName + "]");
}
}
}
builder.setScoreMode(ScoreMode.None);
ToParentBlockJoinQuery joinQuery = builder.build();
if (joinQuery != null) {
Query innerQuery;
if (builder.queryFound()) {
innerQuery = builder.getInnerQuery();
} else {
innerQuery = new XConstantScoreQuery(builder.getInnerFilter());
}
innerQuery.setBoost(boost);
Filter nestedFilter;
if (join) {
nestedFilter = Queries.wrap(joinQuery, parseContext);
} else {
nestedFilter = Queries.wrap(innerQuery, parseContext);
}
if (cache) {
nestedFilter = parseContext.cacheFilter(nestedFilter, cacheKey);
}
if (filterName != null) {
parseContext.addNamedFilter(filterName, nestedFilter);
}
return nestedFilter;
} else {
return null;
}
}
}