Example usage for org.apache.pdfbox.cos COSDocument getEncryptionDictionary

Introduction

In this page you can find the example usage for org.apache.pdfbox.cos COSDocument getEncryptionDictionary.

Prototype

public COSDictionary getEncryptionDictionary() 

Source Link

Document

This will get the encryption dictionary if the document is encrypted or null if the document is not encrypted.

Usage

From source file:org.dspace.content.packager.PDFPackager.java

License:BSD License

private void crosswalkPDF(Context context, Item item, InputStream metadata)
        throws CrosswalkException, IOException, SQLException, AuthorizeException {
    COSDocument cos = null;

    try {/*from  ww w  . j  a v a 2 s  . co  m*/
        PDFParser parser = new PDFParser(metadata);
        parser.parse();
        cos = parser.getDocument();

        // sanity check: PDFBox breaks on encrypted documents, so give up.
        if (cos.getEncryptionDictionary() != null) {
            throw new MetadataValidationException("This packager cannot accept an encrypted PDF document.");
        }

        /* PDF to DC "crosswalk":
         *
         * NOTE: This is not in a crosswalk plugin because (a) it isn't
         * useful anywhere else, and more importantly, (b) the source
         * data is not XML so it doesn't fit the plugin's interface.
         *
         * pattern of crosswalk -- PDF dict entries to DC:
         *   Title -> title.null
         *   Author -> contributor.author
         *   CreationDate -> date.created
         *   ModDate -> date.created
         *   Creator -> description.provenance (application that created orig)
         *   Producer -> description.provenance (convertor to pdf)
         *   Subject -> description.abstract
         *   Keywords -> subject.other
         *    date is java.util.Calendar
         */
        PDDocument pd = new PDDocument(cos);
        PDDocumentInformation docinfo = pd.getDocumentInformation();
        String title = docinfo.getTitle();

        // sanity check: item must have a title.
        if (title == null) {
            throw new MetadataValidationException(
                    "This PDF file is unacceptable, it does not have a value for \"Title\" in its Info dictionary.");
        }
        if (log.isDebugEnabled()) {
            log.debug("PDF Info dict title=\"" + title + "\"");
        }
        item.addDC("title", null, "en", title);
        String value = docinfo.getAuthor();
        if (value != null) {
            item.addDC("contributor", "author", null, value);
            if (log.isDebugEnabled()) {
                log.debug("PDF Info dict author=\"" + value + "\"");
            }
        }

        value = docinfo.getCreator();
        if (value != null) {
            item.addDC("description", "provenance", "en",
                    "Application that created the original document: " + value);
        }

        value = docinfo.getProducer();
        if (value != null) {
            item.addDC("description", "provenance", "en", "Original document converted to PDF by: " + value);
        }

        value = docinfo.getSubject();
        if (value != null) {
            item.addDC("description", "abstract", null, value);
        }

        value = docinfo.getKeywords();
        if (value != null) {
            item.addDC("subject", "other", null, value);
        }

        // Take either CreationDate or ModDate as "date.created",
        // Too bad there's no place to put "last modified" in the DC.
        Calendar calValue = docinfo.getCreationDate();
        if (calValue == null) {
            calValue = docinfo.getModificationDate();
        }

        if (calValue != null) {
            item.addDC("date", "created", null, (new DCDate(calValue.getTime())).toString());
        }
        item.update();
    } finally {
        if (cos != null) {
            cos.close();
        }
    }
}

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