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package com.custom.convert.minio;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Map;
import org.apache.camel.Converter;

@Converter(generateLoader = true)
public final class CamelMinioConverters {

    private CamelMinioConverters() {
    }

    @SuppressWarnings("deprecation")
    @Converter
    public static InputStream fromMapToInputStream(Map<String, Object> map) {

      String json = "{}";
      try {
        json = new ObjectMapper().writeValueAsString(map);
      } catch (JsonProcessingException e) {
        e.printStackTrace();
      }
     newIn.setBody(new ByteArrayInputStream(json.getBytes()));
     return new ByteArrayInputStream(json.getBytes());
    }

}

package com.custom.aggregate.minio;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.apache.camel.AggregationStrategy;
import org.apache.camel.Exchange;
import org.apache.camel.Message;

public class StringAggregator implements AggregationStrategy {

    //@Override
    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
      Message newIn = newExchange.getIn();
      Map<String, String> keyMap = (HashMap) newIn.getHeaders().get("camel.kafka.connector.record.key");
      String key = keyMap.get("id");
      SimpleDateFormat sdf = new SimpleDateFormat("ddMMyy-hhmmss-SSS");       
      String fileName = "KafkaExchangeKafka-" + key + "-" + sdf.format( new Date() );
      newIn.setHeader("file", "Exchange" + fileName);

             

     // lets append the old body to the new body
        if (oldExchange == null) {
            return newExchange;
        }

        String body = oldExchange.getIn().getBody(String.class);
        if (body != null) {
            String newBody = newIn.getBody(String.class);
            if (newBody != null) {
                body += System.lineSeparator() + newBody;
            }

            newIn.setBody(body);
        }
        return newExchange;
    }
}