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/*
* 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.search.rescore;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
/**
*
*/
public class RescoreParseElement implements SearchParseElement {
@Override
public void parse(XContentParser parser, SearchContext context) throws Exception {
if (parser.currentToken() == XContentParser.Token.START_ARRAY) {
while (parser.nextToken() != XContentParser.Token.END_ARRAY) {
context.addRescore(parseSingleRescoreContext(parser, context.indexShard().getQueryShardContext()));
}
} else {
context.addRescore(parseSingleRescoreContext(parser, context.indexShard().getQueryShardContext()));
}
}
public RescoreSearchContext parseSingleRescoreContext(XContentParser parser, QueryShardContext context) throws ElasticsearchParseException, IOException {
String fieldName = null;
RescoreSearchContext rescoreContext = null;
Integer windowSize = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
fieldName = parser.currentName();
if (QueryRescorer.NAME.equals(fieldName)) {
// we only have one at this point
Rescorer rescorer = QueryRescorer.INSTANCE;
token = parser.nextToken();
if (token != XContentParser.Token.START_OBJECT) {
throw new ElasticsearchParseException("rescore type malformed, must start with start_object");
}
rescoreContext = rescorer.parse(parser, context);
}
} else if (token.isValue()) {
if ("window_size".equals(fieldName)) {
windowSize = parser.intValue();
} else {
throw new IllegalArgumentException("rescore doesn't support [" + fieldName + "]");
}
}
}
if (rescoreContext == null) {
throw new IllegalArgumentException("missing rescore type");
}
if (windowSize != null) {
rescoreContext.setWindowSize(windowSize.intValue());
}
return rescoreContext;
}
}
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