ru.mystamps.web.support.beanvalidation.MaxFileSizeValidator.java Source code

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Here is the source code for ru.mystamps.web.support.beanvalidation.MaxFileSizeValidator.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.support.beanvalidation;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import org.apache.commons.lang3.StringUtils;

import org.springframework.web.multipart.MultipartFile;

/**
 * @author Sergey Chechenev
 * @author Slava Semushin
 */
public class MaxFileSizeValidator implements ConstraintValidator<MaxFileSize, MultipartFile> {
    private long maxFileSizeInBytes;

    @Override
    public void initialize(MaxFileSize annotation) {
        maxFileSizeInBytes = annotation.value() * annotation.unit().getSize();
    }

    @Override
    public boolean isValid(MultipartFile file, ConstraintValidatorContext context) {

        if (file == null) {
            return true;
        }

        if (StringUtils.isEmpty(file.getOriginalFilename())) {
            return true;
        }

        return file.getSize() <= maxFileSizeInBytes;
    }
}