oglimmer/lunchy

package de.oglimmer.lunchy.services;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import javax.servlet.ServletContext;
import javax.ws.rs.core.MediaType;

public class FileService {

    private FileService() {
    }

    public static boolean exists(String webServedFile, ServletContext jspContext) {
        String fullQualFileName = jspContext.getRealPath(webServedFile);
        if (fullQualFileName != null) {
            File file = new File(fullQualFileName);
            return file.exists();
        }
        return false;
    }

    public static void move(String uniqueId, String filename) throws IOException {
        File file = new File(LunchyProperties.INSTANCE.getTmpPath() + "/" + uniqueId);
        File newFile = new File(LunchyProperties.INSTANCE.getPictureDestinationPath() + "/" + filename);

        move(file, newFile);
    }

    public static void move(File file, File newFile) throws IOException {
        Files.move(file.toPath(), newFile.toPath());
    }

    public static void copy(File file, File newFile) throws IOException {
        Files.copy(file.toPath(), newFile.toPath());
    }

    public static String getFileExtension(String originalFilename) {
        String type = getFileType(originalFilename);
        if (!type.isEmpty()) {
            return "." + type;
        }
        return "";
    }

    public static String getFileType(String originalFilename) {
        if (originalFilename.contains(".")) {
            return originalFilename.substring(originalFilename.lastIndexOf(".") + 1).toLowerCase();
        }
        return "";
    }

    public static String getMediaTypeFromFileExtension(String filename) {
        String fileExt = FileService.getFileExtension(filename);
        String mt;
        switch (fileExt) {
        case ".jpg":
        case ".jpeg":
            mt = "image/jpeg";
            break;
        case ".gif":
            mt = "image/gif";
            break;
        case ".png":
            mt = "image/png";
            break;
        default:
            mt = MediaType.APPLICATION_OCTET_STREAM;
        }
        return mt;
    }

}