at.tugraz.sss.serv.util.SSPDFFromXHTMLImageEmbedder.java Source code

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Here is the source code for at.tugraz.sss.serv.util.SSPDFFromXHTMLImageEmbedder.java

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/**
* Code contributed to the Learning Layers project
* http://www.learning-layers.eu
* Development is partly funded by the FP7 Programme of the European Commission under
* Grant Agreement FP7-ICT-318209.
* Copyright (c) 2015, Graz University of Technology - KTI (Knowledge Technologies Institute).
* For a list of contributors see the AUTHORS file at the top-level directory of this distribution.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package at.tugraz.sss.serv.util;

import com.lowagie.text.Image;
import java.io.FileInputStream;
import java.io.InputStream;
import org.apache.poi.util.IOUtils;
import org.w3c.dom.Element;
import org.xhtmlrenderer.extend.FSImage;
import org.xhtmlrenderer.extend.ReplacedElement;
import org.xhtmlrenderer.extend.ReplacedElementFactory;
import org.xhtmlrenderer.extend.UserAgentCallback;
import org.xhtmlrenderer.layout.LayoutContext;
import org.xhtmlrenderer.pdf.ITextFSImage;
import org.xhtmlrenderer.pdf.ITextImageElement;
import org.xhtmlrenderer.render.BlockBox;
import org.xhtmlrenderer.simple.extend.FormSubmissionListener;

public class SSPDFFromXHTMLImageEmbedder implements ReplacedElementFactory {

    private final ReplacedElementFactory superFactory;

    public SSPDFFromXHTMLImageEmbedder(ReplacedElementFactory superFactory) {
        this.superFactory = superFactory;
    }

    @Override
    public ReplacedElement createReplacedElement(LayoutContext layoutContext, BlockBox blockBox,
            UserAgentCallback uac, int cssWidth, int cssHeight) {

        Element element = blockBox.getElement();

        if (element == null) {
            return null;
        }

        String nodeName = element.getNodeName();
        String className = element.getAttribute("class");
        String src = element.getAttribute("src");

        if (!"img".equals(nodeName) || !className.contains("xmyImagex") || src == null) {

            return superFactory.createReplacedElement(layoutContext, blockBox, uac, cssWidth, cssHeight);
        }

        InputStream in = null;

        try {

            try {
                in = new FileInputStream(src);
            } catch (Exception error) {
                throw error;
            }

            final byte[] bytes = IOUtils.toByteArray(in);
            final Image image = Image.getInstance(bytes);
            final FSImage fsImage = new ITextFSImage(image);

            fsImage.scale(cssWidth, cssHeight);

            return new ITextImageElement(fsImage);
        } catch (Exception error) {

            SSLogU.debug(error);

            return superFactory.createReplacedElement(layoutContext, blockBox, uac, cssWidth, cssHeight);

        } finally {
            IOUtils.closeQuietly(in);
        }
    }

    @Override
    public void reset() {
        superFactory.reset();
    }

    @Override
    public void remove(Element e) {
        superFactory.remove(e);
    }

    @Override
    public void setFormSubmissionListener(FormSubmissionListener listener) {
        superFactory.setFormSubmissionListener(listener);
    }
}