cn.edu.zjnu.acm.judge.service.MessageService.java Source code

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Here is the source code for cn.edu.zjnu.acm.judge.service.MessageService.java

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/*
 * Copyright 2016 ZJNU ACM.
 *
 * Licensed 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 cn.edu.zjnu.acm.judge.service;

import cn.edu.zjnu.acm.judge.domain.Message;
import cn.edu.zjnu.acm.judge.exception.MessageException;
import cn.edu.zjnu.acm.judge.mapper.MessageMapper;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 *
 * @author zhanhb
 */
@Service
public class MessageService {

    @Autowired
    private MessageMapper messageMapper;

    @Transactional
    public void save(Long parentId, Long problemId, String userId, String title, String content) {
        long depth = 0;
        long orderNum = 0;

        final long nextId = messageMapper.nextId();
        final Message parent = parentId != null ? Optional.ofNullable(messageMapper.findOne(parentId))
                .orElseThrow(() -> new MessageException("No such parent message", HttpStatus.NOT_FOUND)) : null;
        if (parent != null) {
            orderNum = parent.getOrder();
            final long depth1 = parent.getDepth();

            List<Message> messages = messageMapper
                    .findAllByThreadIdAndOrderNumGreaterThanOrderByOrderNum(parent.getThread(), parent.getOrder());
            for (Message m : messages) {
                depth = m.getDepth();
                if (depth <= depth1) {
                    break;
                }
                orderNum = m.getOrder();
            }
            depth = depth1 + 1;
            messageMapper.updateOrderNumByThreadIdAndOrderNumGreaterThan(parent.getThread(), orderNum);
            ++orderNum;
        }
        messageMapper.save(nextId, parentId, orderNum, problemId, depth, userId, title, content);
        if (parent != null) {
            messageMapper.updateThreadIdByThreadId(nextId, parent.getThread());
        }
    }

}