ch.codeblock.qrinvoice.pdf.PdfMerger Maven / Gradle / Ivy

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Provides an OpenPDF specific payment part receipt writer
There is a newer version: 1.20
/*-
 * #%L
 * QR Invoice Solutions
 * %%
 * Copyright (C) 2017 - 2022 Codeblock GmbH
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 * -
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 * -
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses are available for this software. These replace the above
 * AGPLv3 terms and offer support, maintenance and allow the use in commercial /
 * proprietary products.
 * -
 * More information on commercial licenses are available at the following page:
 * https://www.qr-invoice.ch/licenses/
 * #L%
 */
package ch.codeblock.qrinvoice.pdf;

import ch.codeblock.qrinvoice.TechnicalException;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfSmartCopy;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class PdfMerger extends AbstractPdfMerger implements AutoCloseable {

    public static PdfMerger create() {
        return new PdfMerger();
    }

    private final ByteArrayOutputStream baos;
    final Document document;
    final PdfCopy copy;

    public PdfMerger() {
        baos = new ByteArrayOutputStream();
        document = new Document();
        copy = new PdfSmartCopy(document, baos);
        document.open();
    }


    @Override
    public void close() {
        copy.close();
        if (document.isOpen()) {
            document.close();
        }
    }

    public PdfMerger addPdf(final byte[] data) {
        return addPdf(data, false);
    }

    // TODO implement test
    public PdfMerger addPdf(final byte[] data, boolean exceptLastPage) {
        try {
            final PdfReader pdfReaderOne = new PdfReader(data);
            int numberOfPages = pdfReaderOne.getNumberOfPages();
            if (exceptLastPage) {
                numberOfPages--;
            }
            importPdf(pdfReaderOne, copy, numberOfPages).freeReader(pdfReaderOne);
            pdfReaderOne.close();
        } catch (DocumentException | IOException e) {
            throw new TechnicalException("Unable to append PDF", e);
        }
        return this;
    }

    public byte[] getPdf() {
        close();
        return baos.toByteArray();
    }
}