Example usage for com.lowagie.text.pdf PdfStamper getMoreInfo

Introduction

In this page you can find the example usage for com.lowagie.text.pdf PdfStamper getMoreInfo.

Prototype

public HashMap getMoreInfo() 

Source Link

Document

Gets the optional String map to add or change values in the info dictionary.

Usage

From source file:org.mnsoft.pdfocr.Wrapper.java

License:Open Source License

@SuppressWarnings({ "unchecked", "rawtypes" })
private void mergePDFs(File foreground, File background, File newFile, String title, String subject,
        String keywords, String author, String creator) {
    log.debug("Merge " + foreground + " (FG) and " + background + " (BG) to " + newFile);

    final double threshold = ((Integer) StringUtility.StringToInteger(getAttribute("THRESHOLD"), 2))
            .doubleValue();//from   ww w  .  j  ava2 s.co m

    try {
        /*
         * Foreground: Original Image.
         * Background: OCR'd Text
         */
        final PdfReader fg = new PdfReader(foreground.getAbsolutePath());
        final PdfReader bg = new PdfReader(background.getAbsolutePath());

        /*
         * Count pages for foreground and background
         */
        final int fg_num_pages = fg.getNumberOfPages();
        final int bg_num_pages = bg.getNumberOfPages();

        if (fg_num_pages != bg_num_pages) {
            log.error(
                    "! Foreground and background have different number of pages. This should really not happen.");
        }

        /*
         *  The output document
         */
        final PdfStamper fg_writer = new PdfStamper(fg, new FileOutputStream(newFile));

        /*
         * Create a PdfTemplate from the first page of mark
         * (PdfImportedPage is derived from PdfTemplate)
         */
        PdfImportedPage bg_page = null;
        for (int i = 0; i < fg_num_pages;) {
            ++i;
            System.out.print(" [" + i + "]");

            final byte[] fg_page_content = fg.getPageContent(i);
            final byte[] bg_page_content = bg.getPageContent(i);

            final int bg_size = bg_page_content.length;
            final int fg_size = fg_page_content.length;

            /*
             * If we're not explicitly merging, we're merging
             * the document with itself only anyway.
             */
            if (!"true".equals(getAttribute("mergefiles"))) {
                continue;
            }

            /*
             * Modification 20130904
             *
             * We want to scan only what's not been generated by a number of
             * generators. So, until now, the generator of whom we wanted to
             * ignore files was ocr, i.e. the one we set ourselves. Now, we
             * have seen that when we run an OCR on a "pdf+text" file, as we
             * collate in post the file with its image, we get an overlapping
             * text which is not pixel correct, i.e. which makes the PDF appear
             * not nicely.
             *
             * If the background image is not at least threshold times as large as
             * the foreground image, we assume we've been working on a
             * page that was plain text already, and don't add the image
             * to the background.
             */
            if ((bg_size / fg_size) <= threshold) {
                log.debug("! Not adding background for page " + i + " since background size (" + bg_size
                        + ") not different enough from foreground size (" + fg_size + ").");

                continue;
            }

            bg_page = fg_writer.getImportedPage(bg, i);

            final PdfContentByte contentByte = fg_writer.getUnderContent(i);

            contentByte.addTemplate(bg_page, 0, 0);
        }

        HashMap map = fg_writer.getMoreInfo();
        if (map == null) {
            map = new HashMap();
        }

        if (title != null) {
            map.put("Title", title);
        }

        if (subject != null) {
            map.put("Subject", subject);
        }

        if (keywords != null) {
            map.put("Keywords", keywords);
        }

        if (author != null) {
            map.put("Author", author);
        }

        if (creator != null) {
            map.put("Creator", creator);
        }

        fg_writer.setMoreInfo(map);

        fg_writer.close();

        System.out.println("");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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