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package io.github.hpsocket.soa.starter.rocketmq.util;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;

import org.apache.rocketmq.client.apis.message.MessageView;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;

/** RocketMQ 通用辅助类 */
public class RocketmqHelper
{
    /** {@linkplain MessageView} 消息内容转为 {@linkplain byte[]} */
    public static final byte[] getMessageViewBody(MessageView messageView)
    {
        ByteBuffer byteBuffer = messageView.getBody();
        byte[] body = new byte[byteBuffer.remaining()];
        
        byteBuffer.get(body);
        return body;
    }

    /** {@linkplain MessageView} 消息内容转为 {@linkplain String} */
    public static final String getMessageViewBodyAsString(MessageView messageView)
    {
        return StandardCharsets.UTF_8.decode(messageView.getBody()).toString();
    }
    
    /** {@linkplain MessageView} 消息内容转为 {@linkplain JSONObject} */
    public static final JSONObject getMessageViewBodyAsJsonObject(MessageView messageView)
    {
        return JSON.parseObject(getMessageViewBody(messageView));
    }
    
    /** {@linkplain MessageView} 消息内容转为指定类型对象 */
    public static final T getMessageViewBodyAsObject(MessageView messageView, Class clazz)
    {
        return JSON.parseObject(getMessageViewBody(messageView), clazz);
    }
    
}