file-online-preview/server/src/main/java/cn/keking/service/impl/CompressFilePreviewImpl.java

package cn.keking.service.impl;

import cn.keking.config.ConfigConstants;
import cn.keking.model.FileAttribute;
import cn.keking.model.ReturnResponse;
import cn.keking.service.FilePreview;
import cn.keking.utils.DownloadUtils;
import cn.keking.service.FileHandlerService;
import cn.keking.service.CompressFileReader;
import org.springframework.stereotype.Service;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;

/**
 * Created by kl on 2018/1/17.
 * Content :处理压缩包文件
 */
@Service
public class CompressFilePreviewImpl implements FilePreview {

    private final FileHandlerService fileHandlerService;
    private final CompressFileReader compressFileReader;
    private final OtherFilePreviewImpl otherFilePreview;

    public CompressFilePreviewImpl(FileHandlerService fileHandlerService, CompressFileReader compressFileReader, OtherFilePreviewImpl otherFilePreview) {
        this.fileHandlerService = fileHandlerService;
        this.compressFileReader = compressFileReader;
        this.otherFilePreview = otherFilePreview;
    }

    @Override
    public String filePreviewHandle(String url, Model model, FileAttribute fileAttribute) {
        String fileName=fileAttribute.getName();
        String fileTree;
        // 判断文件名是否存在(redis缓存读取)
        if (!StringUtils.hasText(fileHandlerService.getConvertedFile(fileName))  || !ConfigConstants.isCacheEnabled()) {
            ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, fileName);
            if (response.isFailure()) {
                return otherFilePreview.notSupportedFile(model, fileAttribute, response.getMsg());
            }
            String filePath = response.getContent();
            fileTree = compressFileReader.unRar(filePath, fileName);
            if (fileTree != null && !"null".equals(fileTree)) {
                if (ConfigConstants.isCacheEnabled()) {
                    // 加入缓存
                    fileHandlerService.addConvertedFile(fileName, fileTree);
                }
            }
        } else {
            fileTree = fileHandlerService.getConvertedFile(fileName);
        }
        if (fileTree != null && !"null".equals(fileTree)) {
            model.addAttribute("fileTree", fileTree);
            return COMPRESS_FILE_PREVIEW_PAGE;
        } else {
            return otherFilePreview.notSupportedFile(model, fileAttribute, "压缩文件类型不受支持");
        }
    }
}