Package eu.europa.esig.dss.pdf

Class PdfModificationDetectionUtils

java.lang.Object

eu.europa.esig.dss.pdf.PdfModificationDetectionUtils

public class PdfModificationDetectionUtils
extends Object

The class contains utils for modification detection

Method Summary

Modifier and Type	Method	Description
static List<PdfModification>	getAnnotationOverlaps(PdfDocumentReader reader)	Returns a list of found annotation overlaps
static List<PdfModification>	getPagesDifferences(PdfDocumentReader signedRevisionReader, PdfDocumentReader finalRevisionReader)	Returns a list of missing/added pages between signed and final revisions
static List<PdfModification>	getVisualDifferences(PdfDocumentReader signedRevisionReader, PdfDocumentReader finalRevisionReader)	Returns a list of visual differences found between signed and final revisions excluding newly created annotations
static boolean	isAnnotationBoxOverlapping(AnnotationBox annotationBox, List<PdfAnnotation> pdfAnnotations)	Checks if the given annotationBox overlaps with otherAnnotations

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

getAnnotationOverlaps

public static List<PdfModification> getAnnotationOverlaps(PdfDocumentReader reader)
                                                   throws IOException

Returns a list of found annotation overlaps

Parameters:

reader - PdfDocumentReader the complete PDF document reader

Returns:

a list of PdfModifications

Throws:

IOException - if an exception occurs

isAnnotationBoxOverlapping

public static boolean isAnnotationBoxOverlapping(AnnotationBox annotationBox,
List<PdfAnnotation> pdfAnnotations)

Checks if the given annotationBox overlaps with otherAnnotations

Parameters:

annotationBox - AnnotationBox to check

pdfAnnotations - a list of PdfAnnotation to validate against

Returns:

TRUE when annotationBox overlaps with at least one element from otherAnnotations list, FALSE otherwise

getVisualDifferences

public static List<PdfModification> getVisualDifferences(PdfDocumentReader signedRevisionReader,
PdfDocumentReader finalRevisionReader)
                                                  throws IOException

Returns a list of visual differences found between signed and final revisions excluding newly created annotations

Parameters:

signedRevisionReader - PdfDocumentReader for the signed (covered) revision content

finalRevisionReader - PdfDocumentReader for the originally provided document

Returns:

a list of PdfModifications

Throws:

IOException - if an exception occurs

getPagesDifferences

public static List<PdfModification> getPagesDifferences(PdfDocumentReader signedRevisionReader,
PdfDocumentReader finalRevisionReader)

Returns a list of missing/added pages between signed and final revisions

Parameters:

signedRevisionReader - PdfDocumentReader for the signed (covered) revision content

finalRevisionReader - PdfDocumentReader for the originally provided document

Returns:

a list of PdfModifications