at.gv.egiz.pdfas.impl.vfilter
Class VerificationFilterImpl

java.lang.Object
  at.gv.egiz.pdfas.impl.vfilter.VerificationFilterImpl

All Implemented Interfaces:

VerificationFilter

public class VerificationFilterImpl

extends Object

implements VerificationFilter

Author:

wprinz

Nested Class Summary

protected static class

VerificationFilterImpl.SignaturesAndOld

Field Summary

static String	ASSUME_ONLY_SIGNATURE_BLOCKS
static String	BINARY_ONLY
static String	CHECK_DOCUMENT

Constructor Summary

VerificationFilterImpl()

Method Summary

protected void	checkBinaryOnly(PdfDataSource pdf, boolean considerOldSigs)
protected void	debugIUBlocks(List blocks)
protected void	debugPartitions(List partitions)
protected String	determineRestText(List newSignatures, String extractedText)
protected List	extractBinarySignaturesOnly(PdfDataSource pdf, List blocks) Extracts the binary singatures from the given PDF.
protected List	extractNewAndOldSignaturesFromText(String text)
protected List	extractNewSignaturesFromText(String text)
protected SignatureHolder	extractOldSignature(String extractedText, List newSignatures) Extracts the old signature from the text, but only if it is older than the oldest signature of the new signatueres.
protected List	extractOldSignaturesFromText(String text)
List	extractSignatureHolders(PdfDataSource pdf, List blocks, VerificationFilterParameters parameters) Extracts the signatures from the given PDF.
protected List	extractSignatures(PdfDataSource pdf, int endOfDocument)
protected VerificationFilterImpl.SignaturesAndOld	extractSignaturesAndOld(String text)
protected List	extractSignaturesFromPartition(PdfDataSource pdf, Partition partition)
protected VerificationFilterImpl.SignaturesAndOld	extractSignaturesFromPartitionAndOld(PdfDataSource pdf, Partition partition)
List	extractSignaturHolders(TextDataSource text, VerificationFilterParameters parameters) Extracts the text signatures from the given free-text.
protected String	extractText(PdfDataSource pdf, int endOfDocument)
protected String	extractText(PdfDataSource pdf, int endOfDocument, String encoding)
protected List	filterOutBinarySignatures(List signatures)
protected List	flattenOutTextPartitions(List partitions, List blocks)
protected List	intermingleSignatures(List binarySignatures, List extractedSignatures)
protected String	normalizeText(String freetext)
protected List	performBinaryOnly(PdfDataSource pdf, List blocks)
protected List	performFullConservative(PdfDataSource pdf, boolean scanForOldSignatures, List blocks, List partitions)
protected List	performSemiConservative(PdfDataSource pdf, boolean scanForOldSignatures, List blocks, List partitions)
protected void	sortSignatures(List signatures)
protected void	unrollLinearization(List blocks) Removes the linearization footer from the list of update blocks.

Methods inherited from class java.lang.Object

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

Field Detail

CHECK_DOCUMENT

public static final String CHECK_DOCUMENT

See Also:

Constant Field Values

BINARY_ONLY

public static final String BINARY_ONLY

See Also:

Constant Field Values

ASSUME_ONLY_SIGNATURE_BLOCKS

public static final String ASSUME_ONLY_SIGNATURE_BLOCKS

See Also:

Constant Field Values

Constructor Detail

VerificationFilterImpl

public VerificationFilterImpl()

Method Detail

extractSignatureHolders

public List extractSignatureHolders(PdfDataSource pdf,
                                    List blocks,
                                    VerificationFilterParameters parameters)
                             throws VerificationFilterException

Description copied from interface: VerificationFilter

Extracts the signatures from the given PDF.

Specified by:

extractSignatureHolders in interface VerificationFilter

Parameters:

pdf - The PDF.

blocks - The List of Incremental Update blocks. Usually this comes from a preprocessing step.

parameters - The algorithm parameters.

Returns:

Returns a List of SignatureHolders containing the signatures. May be empty in case no signatures have been found.

Throws:

VerificationFilterException - Thrown if something goes wrong.

See Also:

VerificationFilter.extractSignatureHolders(at.gv.egiz.pdfas.framework.input.PdfDataSource, java.util.List, at.gv.egiz.pdfas.framework.vfilter.VerificationFilterParameters)

extractSignaturHolders

public List extractSignaturHolders(TextDataSource text,
                                   VerificationFilterParameters parameters)
                            throws VerificationFilterException

Description copied from interface: VerificationFilter

Extracts the text signatures from the given free-text.

Specified by:

extractSignaturHolders in interface VerificationFilter

Parameters:

text - The free-text.

parameters - The algorithm parameters.

Returns:

Returns a List of SignatureHolders containing the signatures. May be empty in case no signatures have been found.

Throws:

VerificationFilterException - Thrown if something goes wrong.

See Also:

VerificationFilter.extractSignaturHolders(at.gv.egiz.pdfas.framework.input.TextDataSource, at.gv.egiz.pdfas.framework.vfilter.VerificationFilterParameters)

normalizeText

protected String normalizeText(String freetext)
                        throws VerificationFilterException

Throws:

VerificationFilterException

unrollLinearization

protected void unrollLinearization(List blocks)

Removes the linearization footer from the list of update blocks.

Parameters:

blocks - The list of FooterParseResult objects in \prev order.

performBinaryOnly

protected List performBinaryOnly(PdfDataSource pdf,
                                 List blocks)
                          throws VerificationFilterException

Throws:

VerificationFilterException

performSemiConservative

protected List performSemiConservative(PdfDataSource pdf,
                                       boolean scanForOldSignatures,
                                       List blocks,
                                       List partitions)
                                throws VerificationFilterException

Throws:

VerificationFilterException

performFullConservative

protected List performFullConservative(PdfDataSource pdf,
                                       boolean scanForOldSignatures,
                                       List blocks,
                                       List partitions)
                                throws VerificationFilterException

Throws:

VerificationFilterException

flattenOutTextPartitions

protected List flattenOutTextPartitions(List partitions,
                                        List blocks)

extractText

protected String extractText(PdfDataSource pdf,
                             int endOfDocument)
                      throws PresentableException

Throws:

PresentableException

extractText

protected String extractText(PdfDataSource pdf,
                             int endOfDocument,
                             String encoding)
                      throws PresentableException

Throws:

PresentableException

extractNewSignaturesFromText

protected List extractNewSignaturesFromText(String text)
                                     throws VerificationFilterException

Throws:

VerificationFilterException

extractNewAndOldSignaturesFromText

protected List extractNewAndOldSignaturesFromText(String text)
                                           throws VerificationFilterException

Throws:

VerificationFilterException

extractOldSignaturesFromText

protected List extractOldSignaturesFromText(String text)
                                     throws PresentableException

Throws:

PresentableException

intermingleSignatures

protected List intermingleSignatures(List binarySignatures,
                                     List extractedSignatures)

filterOutBinarySignatures

protected List filterOutBinarySignatures(List signatures)

sortSignatures

protected void sortSignatures(List signatures)

debugIUBlocks

protected void debugIUBlocks(List blocks)

debugPartitions

protected void debugPartitions(List partitions)

extractBinarySignaturesOnly

protected List extractBinarySignaturesOnly(PdfDataSource pdf,
                                           List blocks)
                                    throws VerificationFilterException

Extracts the binary singatures from the given PDF.

IU blocks without an egiz dict are not considered.

Parameters:

pdf -

blocks -

Returns:

Returns the List of signature holders.

Throws:

PresentableException

VerificationFilterException

extractSignatures

protected List extractSignatures(PdfDataSource pdf,
                                 int endOfDocument)
                          throws VerificationFilterException

Throws:

VerificationFilterException

determineRestText

protected String determineRestText(List newSignatures,
                                   String extractedText)

extractSignaturesFromPartition

protected List extractSignaturesFromPartition(PdfDataSource pdf,
                                              Partition partition)
                                       throws VerificationFilterException

Throws:

VerificationFilterException

extractSignaturesFromPartitionAndOld

protected VerificationFilterImpl.SignaturesAndOld extractSignaturesFromPartitionAndOld(PdfDataSource pdf,
                                                                                       Partition partition)
                                                                                throws VerificationFilterException

Throws:

VerificationFilterException

checkBinaryOnly

protected void checkBinaryOnly(PdfDataSource pdf,
                               boolean considerOldSigs)
                        throws VerificationFilterException

Throws:

VerificationFilterException

extractSignaturesAndOld

protected VerificationFilterImpl.SignaturesAndOld extractSignaturesAndOld(String text)
                                                                   throws VerificationFilterException

Throws:

VerificationFilterException

extractOldSignature

protected SignatureHolder extractOldSignature(String extractedText,
                                              List newSignatures)
                                       throws PDFDocumentException,
                                              SignatureException,
                                              NormalizeException,
                                              SignatureTypesException

Extracts the old signature from the text, but only if it is older than the oldest signature of the new signatueres.

Parameters:

extractedText -

newSignatures -

Returns:

Throws:

PDFDocumentException

SignatureException

NormalizeException

SignatureTypesException