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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.index.query.functionscore.script;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.function.ScoreFunction;
import org.elasticsearch.common.lucene.search.function.ScriptScoreFunction;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.index.query.QueryParsingException;
import org.elasticsearch.index.query.functionscore.ScoreFunctionParser;
import org.elasticsearch.script.ScriptParameterParser;
import org.elasticsearch.script.ScriptParameterParser.ScriptParameterValue;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.script.SearchScript;
import java.io.IOException;
import java.util.Map;
/**
*
*/
public class ScriptScoreFunctionParser implements ScoreFunctionParser {
public static String[] NAMES = { "script_score", "scriptScore" };
@Inject
public ScriptScoreFunctionParser() {
}
@Override
public String[] getNames() {
return NAMES;
}
@Override
public ScoreFunction parse(QueryParseContext parseContext, XContentParser parser) throws IOException, QueryParsingException {
ScriptParameterParser scriptParameterParser = new ScriptParameterParser();
String script = null;
String scriptLang = null;
Map<String, Object> vars = null;
ScriptService.ScriptType scriptType = 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 ("params".equals(currentFieldName)) {
vars = parser.map();
} else {
throw new QueryParsingException(parseContext.index(), NAMES[0] + " query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if (!scriptParameterParser.token(currentFieldName, token, parser)) {
throw new QueryParsingException(parseContext.index(), NAMES[0] + " query does not support [" + currentFieldName + "]");
}
}
}
ScriptParameterValue scriptValue = scriptParameterParser.getDefaultScriptParameterValue();
if (scriptValue != null) {
script = scriptValue.script();
scriptType = scriptValue.scriptType();
}
scriptLang = scriptParameterParser.lang();
if (script == null) {
throw new QueryParsingException(parseContext.index(), NAMES[0] + " requires 'script' field");
}
SearchScript searchScript;
try {
searchScript = parseContext.scriptService().search(parseContext.lookup(), scriptLang, script, scriptType, vars);
return new ScriptScoreFunction(script, vars, searchScript);
} catch (Exception e) {
throw new QueryParsingException(parseContext.index(), NAMES[0] + " the script could not be loaded", e);
}
}
}