/*
* 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.index.Term;
import org.apache.lucene.search.MultiTermQuery;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.BytesRefs;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.query.support.QueryParsers;
import java.io.IOException;
import static org.elasticsearch.index.query.support.QueryParsers.wrapSmartNameQuery;
/**
*
*/
public class PrefixQueryParser implements QueryParser {
public static final String NAME = "prefix";
@Inject
public PrefixQueryParser() {
}
@Override
public String[] names() {
return new String[]{NAME};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
XContentParser.Token token = parser.nextToken();
if (token != XContentParser.Token.FIELD_NAME) {
throw new QueryParsingException(parseContext.index(), "[prefix] query malformed, no field");
}
String fieldName = parser.currentName();
String rewriteMethod = null;
String queryName = null;
Object value = null;
float boost = 1.0f;
token = parser.nextToken();
if (token == XContentParser.Token.START_OBJECT) {
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if ("prefix".equals(currentFieldName)) {
value = parser.objectBytes();
} else if ("value".equals(currentFieldName)) {
value = parser.text();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("rewrite".equals(currentFieldName)) {
rewriteMethod = parser.textOrNull();
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
}
} else {
throw new QueryParsingException(parseContext.index(), "[prefix] query does not support [" + currentFieldName + "]");
}
}
parser.nextToken();
} else {
value = parser.text();
parser.nextToken();
}
if (value == null) {
throw new QueryParsingException(parseContext.index(), "No value specified for prefix query");
}
MultiTermQuery.RewriteMethod method = QueryParsers.parseRewriteMethod(rewriteMethod, null);
Query query = null;
MapperService.SmartNameFieldMappers smartNameFieldMappers = parseContext.smartFieldMappers(fieldName);
if (smartNameFieldMappers != null && smartNameFieldMappers.hasMapper()) {
if (smartNameFieldMappers.explicitTypeInNameWithDocMapper()) {
String[] previousTypes = QueryParseContext.setTypesWithPrevious(new String[]{smartNameFieldMappers.docMapper().type()});
try {
query = smartNameFieldMappers.mapper().prefixQuery(value, method, parseContext);
} finally {
QueryParseContext.setTypes(previousTypes);
}
} else {
query = smartNameFieldMappers.mapper().prefixQuery(value, method, parseContext);
}
}
if (query == null) {
PrefixQuery prefixQuery = new PrefixQuery(new Term(fieldName, BytesRefs.toBytesRef(value)));
if (method != null) {
prefixQuery.setRewriteMethod(method);
}
query = prefixQuery;
}
query.setBoost(boost);
query = wrapSmartNameQuery(query, smartNameFieldMappers, parseContext);
if (queryName != null) {
parseContext.addNamedQuery(queryName, query);
}
return query;
}
}