ru.mystamps.web.service.ImageServiceImpl.java Source code

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Here is the source code for ru.mystamps.web.service.ImageServiceImpl.java

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/*
 * Copyright (C) 2009-2017 Slava Semushin <slava.semushin@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package ru.mystamps.web.service;

import java.util.List;
import java.util.Locale;

import org.apache.commons.lang3.Validate;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.multipart.MultipartFile;

import org.springframework.security.access.prepost.PreAuthorize;

import lombok.RequiredArgsConstructor;

import ru.mystamps.web.dao.ImageDao;
import ru.mystamps.web.dao.dto.ImageDto;
import ru.mystamps.web.dao.dto.ImageInfoDto;
import ru.mystamps.web.service.exception.ImagePersistenceException;
import ru.mystamps.web.support.spring.security.HasAuthority;

import static org.apache.commons.lang3.StringUtils.substringAfter;
import static org.apache.commons.lang3.StringUtils.substringBefore;

@RequiredArgsConstructor
public class ImageServiceImpl implements ImageService {
    private static final Logger LOG = LoggerFactory.getLogger(ImageServiceImpl.class);

    private final ImagePersistenceStrategy imagePersistenceStrategy;
    private final ImageDao imageDao;

    @Override
    @Transactional
    @PreAuthorize("isAuthenticated()")
    public Integer save(MultipartFile file) {
        Validate.isTrue(file != null, "File must be non null");
        Validate.isTrue(file.getSize() > 0, "Image size must be greater than zero");

        String contentType = file.getContentType();
        Validate.isTrue(contentType != null, "File type must be non null");

        String extension = extractExtensionFromContentType(contentType);
        Validate.validState("png".equals(extension) || "jpeg".equals(extension),
                "File type must be PNG or JPEG image, but '%s' (%s) were passed", contentType, extension);

        String imageType = extension.toUpperCase(Locale.US);

        Integer id = imageDao.add(imageType);
        if (id == null) {
            throw new ImagePersistenceException("Can't save image");
        }

        ImageInfoDto image = new ImageInfoDto(id, imageType);
        LOG.info("Image was saved to database ({})", image);

        imagePersistenceStrategy.save(file, image);

        return image.getId();
    }

    @Override
    @Transactional(readOnly = true)
    public ImageDto get(Integer imageId) {
        Validate.isTrue(imageId != null, "Image id must be non null");
        Validate.isTrue(imageId > 0, "Image id must be greater than zero");

        ImageInfoDto image = imageDao.findById(imageId);
        if (image == null) {
            return null;
        }

        return imagePersistenceStrategy.get(image);
    }

    @Override
    @Transactional
    @PreAuthorize(HasAuthority.CREATE_SERIES)
    public void addToSeries(Integer seriesId, Integer imageId) {
        Validate.isTrue(seriesId != null, "Series id must be non null");
        Validate.isTrue(imageId != null, "Image id must be non null");

        imageDao.addToSeries(seriesId, imageId);

        LOG.info("Series #{}: image #{} was added", seriesId, imageId);
    }

    @Override
    @Transactional(readOnly = true)
    public List<Integer> findBySeriesId(Integer seriesId) {
        Validate.isTrue(seriesId != null, "Series id must be non null");

        return imageDao.findBySeriesId(seriesId);
    }

    private static String extractExtensionFromContentType(String contentType) {
        // "image/jpeg; charset=UTF-8" -> "jpeg"
        return substringBefore(substringAfter(contentType, "/"), ";");
    }

}