/*
* 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.search.sort;
import org.apache.lucene.search.FieldComparatorSource;
import org.apache.lucene.search.SortField;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.field.function.sort.DoubleFieldsFunctionDataComparator;
import org.elasticsearch.index.field.function.sort.StringFieldsFunctionDataComparator;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.internal.SearchContext;
import java.util.Map;
/**
* @author kimchy (shay.banon)
*/
public class ScriptSortParser implements SortParser {
@Override public String[] names() {
return new String[]{"_script"};
}
@Override public SortField parse(XContentParser parser, SearchContext context) throws Exception {
String script = null;
String scriptLang = null;
String type = null;
Map<String, Object> params = null;
boolean reverse = false;
XContentParser.Token token;
String currentName = parser.currentName();
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentName = parser.currentName();
} else if (token.isValue()) {
if ("reverse".equals(currentName)) {
reverse = parser.booleanValue();
} else if ("order".equals(currentName)) {
reverse = "desc".equals(parser.text());
} else if ("script".equals(currentName)) {
script = parser.text();
} else if ("type".equals(currentName)) {
type = parser.text();
} else if ("params".equals(currentName)) {
params = parser.map();
} else if ("lang".equals(currentName)) {
scriptLang = parser.text();
}
}
}
if (script == null) {
throw new SearchParseException(context, "_script sorting requires setting the script to sort by");
}
if (type == null) {
throw new SearchParseException(context, "_script sorting requires setting the type of the script");
}
SearchScript searchScript = context.scriptService().search(context.lookup(), scriptLang, script, params);
FieldComparatorSource fieldComparatorSource;
if ("string".equals(type)) {
fieldComparatorSource = StringFieldsFunctionDataComparator.comparatorSource(searchScript);
} else if ("number".equals(type)) {
fieldComparatorSource = DoubleFieldsFunctionDataComparator.comparatorSource(searchScript);
} else {
throw new SearchParseException(context, "custom script sort type [" + type + "] not supported");
}
return new SortField("_script", fieldComparatorSource, reverse);
}
}