org.xcmis.renditions.impl.PDFDocumentRenditionProvider.java Source code

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Here is the source code for org.xcmis.renditions.impl.PDFDocumentRenditionProvider.java

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/**
 * Copyright (C) 2010 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.xcmis.renditions.impl;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.xcmis.spi.ContentStream;
import org.xcmis.spi.RenditionContentStream;
import org.xcmis.spi.RenditionProvider;
import org.xcmis.spi.utils.MimeType;

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

import javax.imageio.ImageIO;

/**
 * @author <a href="mailto:andrey.parfonov@exoplatform.com">Andrey Parfonov</a>
 * @version $Id: PDFDocumentRenditionProvider.java 774 2010-04-16 11:56:20Z
 *          ur3cma $
 */
public class PDFDocumentRenditionProvider implements RenditionProvider {

    private static final MimeType[] SUPPORTED_MEDIA_TYPES = new MimeType[] { new MimeType("application", "pdf") };

    private static final MimeType PRODUCED = new MimeType("image", "png");

    /** The max height. */
    private int maxHeight = 100;

    /** The max width. */
    private int maxWidth = 100;

    /**
     * {@inheritDoc}
     */
    public int getHeight() {
        return -1;
    }

    /**
     * {@inheritDoc}
     */
    public String getKind() {
        return "cmis:thumbnail";
    }

    /**
     * {@inheritDoc}
     */
    public MimeType getProducedMediaType() {
        return PRODUCED;
    }

    /**
     * {@inheritDoc}
     */
    public RenditionContentStream getRenditionStream(ContentStream stream) throws IOException {
        PDDocument pdf = null;
        try {
            pdf = PDDocument.load(stream.getStream());
            PDPage page = (PDPage) pdf.getDocumentCatalog().getAllPages().get(0);
            BufferedImage image = page.convertToImage();
            // Determine scale and be sure both width and height are not greater the max
            int scale = (int) Math.max(Math.floor((image.getHeight() / maxHeight) + 1.0d),
                    Math.floor((image.getWidth() / maxWidth) + 1.0d));
            int height = image.getHeight() / scale;
            int width = image.getWidth() / scale;
            BufferedImage scaledImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D graphics2D = scaledImage.createGraphics();
            graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            graphics2D.drawImage(image, 0, 0, width, height, null);
            graphics2D.dispose();

            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write(scaledImage, "png", out);
            RenditionContentStream renditionStream = new RenditionContentStream(out.toByteArray(), null,
                    new MimeType("image", " png"), getKind(), height, width);
            return renditionStream;
        } finally {
            if (pdf != null) {
                pdf.close();
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    public MimeType[] getSupportedMediaType() {
        return SUPPORTED_MEDIA_TYPES;
    }

    /**
     * {@inheritDoc}
     */
    public int getWidth() {
        return -1;
    }
}