com.epam.reportportal.utils.files.ImageConverter.java Source code

Introduction

Here is the source code for com.epam.reportportal.utils.files.ImageConverter.java

Source

/*
 * Copyright 2016 EPAM Systems
 *
 *
 * This file is part of EPAM Report Portal.
 * https://github.com/epam/ReportPortal
 *
 * Report Portal 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 3 of the License, or
 * (at your option) any later version.
 *
 * Report Portal 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 Report Portal.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.epam.reportportal.utils.files;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

import com.epam.reportportal.exception.InternalReportPortalClientException;
import org.apache.tika.detect.Detector;
import org.apache.tika.io.TikaInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AutoDetectParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.io.ByteSource;

/**
 * This class contains functionality for converting images to Black and white
 * colors
 * 
 * @author Aliaksei_Makayed
 * 
 */
public class ImageConverter {

    private static final Logger logger = LoggerFactory.getLogger(ImageConverter.class);

    public static final String IMAGE_TYPE = "image";

    public static ByteSource convertIfImage(ByteSource content) {
        try {
            byte[] data = content.read();
            if (isImage(data)) {
                return convert(data);
            } else {
                return ByteSource.wrap(data);
            }
        } catch (IOException e) {
            throw new InternalReportPortalClientException("Unable to read screenshot file. " + e);
        }
    }

    /**
     * Convert image to black and white colors
     * 
     * @param source
     * @throws IOException
     * @throws Exception
     */
    public static ByteSource convert(byte[] source) throws IOException {
        BufferedImage image;
        image = ImageIO.read(ByteSource.wrap(source).openBufferedStream());
        final BufferedImage blackAndWhiteImage = new BufferedImage(image.getWidth(null), image.getHeight(null),
                BufferedImage.TYPE_BYTE_GRAY);
        final Graphics2D graphics2D = (Graphics2D) blackAndWhiteImage.getGraphics();
        graphics2D.drawImage(image, 0, 0, null);
        graphics2D.dispose();
        return convertToInputStream(blackAndWhiteImage);
    }

    /**
     * Check is input file is image
     * 
     * @param fileContent
     */
    public static boolean isImage(byte[] fileContent) {

        AutoDetectParser parser = new AutoDetectParser();
        Detector detector = parser.getDetector();
        MediaType mediaType = null;
        try {
            mediaType = detector.detect(TikaInputStream.get(fileContent), new Metadata());
        } catch (Exception e) {
            logger.error("Unable to read file content.", e);
            throw new InternalReportPortalClientException("Unable to read file content.", e);
        }
        return mediaType.toString().contains(IMAGE_TYPE);
    }

    /**
     * Convert BufferedImage to input stream
     * 
     * @param image
     * @throws IOException
     */
    private static ByteSource convertToInputStream(BufferedImage image) {
        ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
        try {
            ImageIO.write(image, "png", byteOutputStream);
        } catch (IOException e) {
            throw new InternalReportPortalClientException("Unable to transform file to byte array.", e);
        }
        return ByteSource.wrap(byteOutputStream.toByteArray());

    }

}