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There is a newer version: 8.2.28

package cn.leancloud.im.v2;

import cn.leancloud.im.AVIMEventHandler;

public abstract class MessageHandler extends AVIMEventHandler {
  public abstract void onMessage(T message, AVIMConversation conversation, AVIMClient client);

  public abstract void onMessageReceipt(T message, AVIMConversation conversation, AVIMClient client);

  @Override
  protected final void processEvent0(final int operation, final Object operator, final Object operand,
                                     Object eventScene) {
    final AVIMConversation conversation = (AVIMConversation) eventScene;
    processMessage(operation, operand, conversation);
  }

  private void processMessage(int operation, final Object operand, AVIMConversation conversation) {
    switch (operation) {
      case Conversation.STATUS_ON_MESSAGE:
        onMessage((T) operand, conversation, conversation.client);
        break;
      case Conversation.STATUS_ON_MESSAGE_RECEIPTED:
        onMessageReceipt((T) operand, conversation, conversation.client);
        break;
      default:
        break;
    }
  }
}