QueryToJson.java

package de.komoot.photon.utils;

import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.json.JsonXContent;
import org.elasticsearch.index.query.QueryBuilder;

import java.io.IOException;

/**
 * Created by Sachin Dole on 2/28/2015.
 */
@Slf4j
public class QueryToJson implements OneWayConverter<QueryBuilder, String> {

    @Override
    public String convert(QueryBuilder anItem) {
        try {
            BytesReference bytes = anItem.toXContent(JsonXContent.contentBuilder(), new ToXContent.MapParams(null)).bytes();
            return new String(bytes.toBytes(), "UTF-8");
        } catch (IOException e) {
            log.error("Unable to transform querybuilder to a json string due to an exception", e);
            return null;
        }
    }
}