Constructor Detail

• XrefTrailerResolver

  public XrefTrailerResolver()

Method Detail

• getFirstTrailer

  public final COSDictionary getFirstTrailer()

  Returns the first trailer if at least one exists.

  Returns:

  the first trailer or null

• getLastTrailer

  public final COSDictionary getLastTrailer()

  Returns the last trailer if at least one exists.

  Returns:

  the last trailer ir null

• getTrailerCount

  public final int getTrailerCount()

  Returns the count of trailers.

  Returns:

  the count of trailers.

• nextXrefObj

  public void nextXrefObj(long startBytePos,
                 XrefTrailerResolver.XRefType type)

  Signals that a new XRef object (table or stream) starts.

  Parameters:

  startBytePos - the offset to start at

  type - the type of the Xref object

• getXrefType

  public XrefTrailerResolver.XRefType getXrefType()

  Returns the XRefTxpe of the resolved trailer.

  Returns:

  the XRefType or null.

• setXRef

  public void setXRef(COSObjectKey objKey,
             long offset)

  Populate XRef HashMap of current XRef object. Will add an Xreftable entry that maps ObjectKeys to byte offsets in the file.

  Parameters:

  objKey - The objkey, with id and gen numbers

  offset - The byte offset in this file

• setTrailer

  public void setTrailer(COSDictionary trailer)

  Adds trailer information for current XRef object.

  Parameters:

  trailer - the current document trailer dictionary

• getCurrentTrailer

  public COSDictionary getCurrentTrailer()

  Returns the trailer last set by setTrailer(COSDictionary).

  Returns:

  the current trailer.

• setStartxref

  public void setStartxref(long startxrefBytePosValue)

  Sets the byte position of the first XRef (has to be called after very last startxref was read). This is used to resolve chain of active XRef/trailer. In case startxref position is not found we output a warning and use all XRef/trailer objects combined in byte position order. Thus for incomplete PDF documents with missing startxref one could call this method with parameter value -1.

  Parameters:

  startxrefBytePosValue - starting position of the first XRef

• getTrailer

  public COSDictionary getTrailer()

  Gets the resolved trailer. Might return null in case setStartxref(long) was not called before.

  Returns:

  the trailer if available

• getXrefTable

  public Map<COSObjectKey,Long> getXrefTable()

  Gets the resolved xref table. Might return null in case setStartxref(long) was not called before.

  Returns:

  the xrefTable if available

• getContainedObjectNumbers

  public Set<Long> getContainedObjectNumbers(int objstmObjNr)

  Returns object numbers which are referenced as contained in object stream with specified object number. This will scan resolved xref table for all entries having negated stream object number as value.

  Parameters:

  objstmObjNr - object number of object stream for which contained object numbers should be returned

  Returns:

  set of object numbers referenced for given object stream or null if setStartxref(long) was not called before so that no resolved xref table exists

• reset

  protected void reset()

  Reset all data so that it can be used to rebuild the trailer.