/*
* 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.IndexOptions;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.TermRangeFilter;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.lucene.search.XBooleanFilter;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import org.elasticsearch.index.mapper.FieldMappers;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.internal.FieldNamesFieldMapper;
import java.io.IOException;
import java.util.List;
import static org.elasticsearch.index.query.support.QueryParsers.wrapSmartNameFilter;
/**
*
*/
public class ExistsFilterParser implements FilterParser {
public static final String NAME = "exists";
@Inject
public ExistsFilterParser() {
}
@Override
public String[] names() {
return new String[]{NAME};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
String fieldPattern = null;
String filterName = null;
XContentParser.Token token;
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 ("field".equals(currentFieldName)) {
fieldPattern = parser.text();
} else if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else {
throw new QueryParsingException(parseContext.index(), "[exists] filter does not support [" + currentFieldName + "]");
}
}
}
if (fieldPattern == null) {
throw new QueryParsingException(parseContext.index(), "exists must be provided with a [field]");
}
return newFilter(parseContext, fieldPattern, filterName);
}
public static Filter newFilter(QueryParseContext parseContext, String fieldPattern, String filterName) {
final FieldMappers fieldNamesMapper = parseContext.mapperService().indexName(FieldNamesFieldMapper.CONTENT_TYPE);
MapperService.SmartNameObjectMapper smartNameObjectMapper = parseContext.smartObjectMapper(fieldPattern);
if (smartNameObjectMapper != null && smartNameObjectMapper.hasMapper()) {
// automatic make the object mapper pattern
fieldPattern = fieldPattern + ".*";
}
List<String> fields = parseContext.simpleMatchToIndexNames(fieldPattern);
if (fields.isEmpty()) {
// no fields exists, so we should not match anything
return Queries.MATCH_NO_FILTER;
}
MapperService.SmartNameFieldMappers nonNullFieldMappers = null;
XBooleanFilter boolFilter = new XBooleanFilter();
for (String field : fields) {
MapperService.SmartNameFieldMappers smartNameFieldMappers = parseContext.smartFieldMappers(field);
if (smartNameFieldMappers != null) {
nonNullFieldMappers = smartNameFieldMappers;
}
Filter filter = null;
if (fieldNamesMapper!= null && fieldNamesMapper.mapper().fieldType().indexOptions() != IndexOptions.NONE) {
final String f;
if (smartNameFieldMappers != null && smartNameFieldMappers.hasMapper()) {
f = smartNameFieldMappers.mapper().names().indexName();
} else {
f = field;
}
filter = fieldNamesMapper.mapper().termFilter(f, parseContext);
}
// if _field_names are not indexed, we need to go the slow way
if (filter == null && smartNameFieldMappers != null && smartNameFieldMappers.hasMapper()) {
filter = smartNameFieldMappers.mapper().rangeFilter(null, null, true, true, parseContext);
}
if (filter == null) {
filter = new TermRangeFilter(field, null, null, true, true);
}
boolFilter.add(filter, BooleanClause.Occur.SHOULD);
}
// we always cache this one, really does not change... (exists)
// its ok to cache under the fieldName cacheKey, since its per segment and the mapping applies to this data on this segment...
Filter filter = parseContext.cacheFilter(boolFilter, new CacheKeyFilter.Key("$exists$" + fieldPattern));
filter = wrapSmartNameFilter(filter, nonNullFieldMappers, parseContext);
if (filterName != null) {
parseContext.addNamedFilter(filterName, filter);
}
return filter;
}
}