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

Introduction

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

Prototype

public Map<COSObjectKey, Long> getXrefTable() 

Source Link

Document

Returns the xrefTable which is a mapping of ObjectKeys to byte offsets in the file.

Usage

From source file:com.aaasec.sigserv.csspsupport.pdfbox.modifications.CsCOSWriter.java

License:Apache License

private void prepareIncrement(PDDocument doc) {
    try {//from  ww  w  . j a  v  a 2  s .  c om
        if (doc != null) {
            COSDocument cosDoc = doc.getDocument();

            Map<COSObjectKey, Long> xrefTable = cosDoc.getXrefTable();
            Set<COSObjectKey> keySet = xrefTable.keySet();
            long highestNumber = 0;
            for (COSObjectKey cosObjectKey : keySet) {
                COSBase object = cosDoc.getObjectFromPool(cosObjectKey).getObject();
                if (object != null && cosObjectKey != null && !(object instanceof COSNumber)) {
                    objectKeys.put(object, cosObjectKey);
                    keyObject.put(cosObjectKey, object);
                }

                long num = cosObjectKey.getNumber();
                if (num > highestNumber) {
                    highestNumber = num;
                }
            }
            setNumber(highestNumber);
            // xrefTable.clear();

        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

---

From source file:org.apache.padaf.preflight.helpers.TrailerValidationHelper.java

License:Apache License

/**
 * Accesses and compares First and Last trailers for a PDF version higher than 1.4.
 * /*from   w w  w .ja v  a 2  s.c o m*/
 * @param handler
 * @param result
 */
protected void checkTrailersForLinearizedPDF15(DocumentHandler handler, List<ValidationError> result) {
    PDDocument pdfDoc = handler.getDocument();
    try {
        COSDocument cosDocument = pdfDoc.getDocument();
        List<COSObject> xrefs = cosDocument.getObjectsByType(COSName.XREF);

        if (xrefs.isEmpty()) {
            // no XRef CosObject, may by this pdf file used the PDF 1.4 syntaxe
            checkTrailersForLinearizedPDF14(handler, result);

        } else {

            long min = Long.MAX_VALUE;
            long max = Long.MIN_VALUE;
            COSDictionary firstTrailer = null;
            COSDictionary lastTrailer = null;

            // Search First and Last trailers according to offset position.
            for (COSObject co : xrefs) {
                long offset = cosDocument.getXrefTable().get(new COSObjectKey(co));
                if (offset < min) {
                    min = offset;
                    firstTrailer = (COSDictionary) co.getObject();
                }

                if (offset > max) {
                    max = offset;
                    lastTrailer = (COSDictionary) co.getObject();
                }

            }

            checkMainTrailer(pdfDoc.getDocument(), firstTrailer, result);
            if (!compareIds(firstTrailer, lastTrailer, pdfDoc.getDocument())) {
                result.add(new ValidationResult.ValidationError(
                        ValidationConstants.ERROR_SYNTAX_TRAILER_ID_CONSISTENCY,
                        "ID is different in the first and the last trailer"));
            }
        }
    } catch (IOException e) {
        result.add(new ValidationResult.ValidationError(ValidationConstants.ERROR_SYNTAX_TRAILER,
                "Unable to check PDF Trailers due to : " + e.getMessage()));
    }
}

---