org.elasticsearch.index.query.ConstantScoreQueryParser Maven / Gradle / Ivy
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* 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.Filter;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.XConstantScoreQuery;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import java.io.IOException;
/**
*
*/
public class ConstantScoreQueryParser implements QueryParser {
public static final String NAME = "constant_score";
@Inject
public ConstantScoreQueryParser() {
}
@Override
public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
Filter filter = null;
boolean filterFound = false;
Query query = null;
boolean queryFound = false;
float boost = 1.0f;
boolean cache = false;
CacheKeyFilter.Key cacheKey = 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 ("filter".equals(currentFieldName)) {
filter = parseContext.parseInnerFilter();
filterFound = true;
} else if ("query".equals(currentFieldName)) {
query = parseContext.parseInnerQuery();
queryFound = true;
} else {
throw new QueryParsingException(parseContext.index(), "[constant_score] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} 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(), "[constant_score] query does not support [" + currentFieldName + "]");
}
}
}
if (!filterFound && !queryFound) {
throw new QueryParsingException(parseContext.index(), "[constant_score] requires either 'filter' or 'query' element");
}
if (query == null && filter == null) {
return null;
}
if (filter != null) {
// cache the filter if possible needed
if (cache) {
filter = parseContext.cacheFilter(filter, cacheKey);
}
Query query1 = new XConstantScoreQuery(filter);
query1.setBoost(boost);
return query1;
}
// Query
query = new ConstantScoreQuery(query);
query.setBoost(boost);
return query;
}
}