/*
* 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.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static org.elasticsearch.common.lucene.search.Queries.fixNegativeQueryIfNeeded;
/**
*
*/
public class BoolQueryParser implements QueryParser {
public static final String NAME = "bool";
@Inject
public BoolQueryParser(Settings settings) {
BooleanQuery.setMaxClauseCount(settings.getAsInt("index.query.bool.max_clause_count", settings.getAsInt("indices.query.bool.max_clause_count", BooleanQuery.getMaxClauseCount())));
}
@Override
public String[] names() {
return new String[]{NAME};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
boolean disableCoord = false;
float boost = 1.0f;
String minimumShouldMatch = null;
List<BooleanClause> clauses = new ArrayList<>();
boolean adjustPureNegative = true;
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 (parseContext.isDeprecatedSetting(currentFieldName)) {
// skip
} else if (token == XContentParser.Token.START_OBJECT) {
switch (currentFieldName) {
case "must":
Query query = parseContext.parseInnerQuery();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.MUST));
}
break;
case "should":
query = parseContext.parseInnerQuery();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.SHOULD));
if (parseContext.isFilter() && minimumShouldMatch == null) {
minimumShouldMatch = "1";
}
}
break;
case "filter":
query = parseContext.parseInnerFilter();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.FILTER));
}
break;
case "must_not":
case "mustNot":
query = parseContext.parseInnerFilter();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.MUST_NOT));
}
break;
default:
throw new QueryParsingException(parseContext, "[bool] query does not support [" + currentFieldName + "]");
}
if (parser.currentToken() != XContentParser.Token.END_OBJECT) {
throw new QueryParsingException(parseContext, "expected [END_OBJECT] but got [{}], possibly too many query clauses",
parser.currentToken());
}
} else if (token == XContentParser.Token.START_ARRAY) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
switch (currentFieldName) {
case "must":
Query query = parseContext.parseInnerQuery();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.MUST));
}
break;
case "should":
query = parseContext.parseInnerQuery();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.SHOULD));
if (parseContext.isFilter() && minimumShouldMatch == null) {
minimumShouldMatch = "1";
}
}
break;
case "filter":
query = parseContext.parseInnerFilter();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.FILTER));
}
break;
case "must_not":
case "mustNot":
query = parseContext.parseInnerFilter();
if (query != null) {
clauses.add(new BooleanClause(query, BooleanClause.Occur.MUST_NOT));
}
break;
default:
throw new QueryParsingException(parseContext, "bool query does not support [" + currentFieldName + "]");
}
}
} else if (token.isValue()) {
if ("disable_coord".equals(currentFieldName) || "disableCoord".equals(currentFieldName)) {
disableCoord = parser.booleanValue();
} else if ("minimum_should_match".equals(currentFieldName) || "minimumShouldMatch".equals(currentFieldName)) {
minimumShouldMatch = parser.textOrNull();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("minimum_number_should_match".equals(currentFieldName) || "minimumNumberShouldMatch".equals(currentFieldName)) {
minimumShouldMatch = parser.textOrNull();
} else if ("adjust_pure_negative".equals(currentFieldName) || "adjustPureNegative".equals(currentFieldName)) {
adjustPureNegative = parser.booleanValue();
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new QueryParsingException(parseContext, "[bool] query does not support [" + currentFieldName + "]");
}
}
}
if (clauses.isEmpty()) {
return new MatchAllDocsQuery();
}
BooleanQuery.Builder booleanQueryBuilder = new BooleanQuery.Builder();
booleanQueryBuilder.setDisableCoord(disableCoord);
for (BooleanClause clause : clauses) {
booleanQueryBuilder.add(clause);
}
BooleanQuery booleanQuery = booleanQueryBuilder.build();
booleanQuery.setBoost(boost);
booleanQuery = Queries.applyMinimumShouldMatch(booleanQuery, minimumShouldMatch);
Query query = adjustPureNegative ? fixNegativeQueryIfNeeded(booleanQuery) : booleanQuery;
if (queryName != null) {
parseContext.addNamedQuery(queryName, query);
}
return query;
}
}