org.elasticsearch.index.query.CustomScoreQueryParser 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.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.lucene.search.function.FunctionScoreQuery;
import org.elasticsearch.common.lucene.search.function.ScriptScoreFunction;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.script.SearchScript;
import java.io.IOException;
import java.util.Map;
/**
* @deprecated use {@link FunctionScoreQueryParser} instead.
*/
public class CustomScoreQueryParser implements QueryParser {
public static final String NAME = "custom_score";
@Inject
public CustomScoreQueryParser() {
}
@Override
public String[] names() {
return new String[] { NAME, Strings.toCamelCase(NAME) };
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
Query query = null;
Filter filter = null;
boolean queryOrFilterFound = false;
float boost = 1.0f;
String script = null;
String scriptLang = null;
Map vars = 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 ("query".equals(currentFieldName)) {
query = parseContext.parseInnerQuery();
queryOrFilterFound = true;
} else if ("filter".equals(currentFieldName)) {
filter = parseContext.parseInnerFilter();
queryOrFilterFound = true;
} else if ("params".equals(currentFieldName)) {
vars = parser.map();
} else {
throw new QueryParsingException(parseContext.index(), "[custom_score] query does not support [" + currentFieldName
+ "]");
}
} else if (token.isValue()) {
if ("script".equals(currentFieldName)) {
script = parser.text();
} else if ("lang".equals(currentFieldName)) {
scriptLang = parser.text();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else {
throw new QueryParsingException(parseContext.index(), "[custom_score] query does not support [" + currentFieldName
+ "]");
}
}
}
if (!queryOrFilterFound) {
throw new QueryParsingException(parseContext.index(), "[custom_score] requires 'query' or 'filter' field");
}
if (script == null) {
throw new QueryParsingException(parseContext.index(), "[custom_score] requires 'script' field");
}
if (query == null && filter == null) {
return null;
} else if (filter != null) {
query = new XConstantScoreQuery(filter);
}
SearchScript searchScript;
try {
searchScript = parseContext.scriptService().search(parseContext.lookup(), scriptLang, script, vars);
} catch (Exception e) {
throw new QueryParsingException(parseContext.index(), "[custom_score] the script could not be loaded", e);
}
FunctionScoreQuery functionScoreQuery = new FunctionScoreQuery(query, new ScriptScoreFunction(script, vars, searchScript));
functionScoreQuery.setBoost(boost);
return functionScoreQuery;
}
}