/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.Query;
import org.apache.lucene.search.spans.SpanFirstQuery;
import org.apache.lucene.search.spans.SpanQuery;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public class SpanFirstQueryParser implements QueryParser {
public static final String NAME = "span_first";
@Inject public SpanFirstQueryParser() {
}
@Override public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
float boost = 1.0f;
SpanQuery match = null;
int end = -1;
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 ("match".equals(currentFieldName)) {
Query query = parseContext.parseInnerQuery();
if (!(query instanceof SpanQuery)) {
throw new QueryParsingException(parseContext.index(), "spanFirst [match] must be of type span query");
}
match = (SpanQuery) query;
}
} else {
if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("end".equals(currentFieldName)) {
end = parser.intValue();
}
}
}
if (match == null) {
throw new QueryParsingException(parseContext.index(), "spanFirst must have [match] span query clause");
}
if (end == -1) {
throw new QueryParsingException(parseContext.index(), "spanFirst must have [end] set for it");
}
SpanFirstQuery query = new SpanFirstQuery(match, end);
query.setBoost(boost);
return query;
}
}