pdf.py

class Pdf:
  def __init__(self, pdfParameter):
    self._pdfParameter = pdfParameter
    self._currentPage = 0
  
  @property
  def fileObject(self):
    return self._fileObject

  @property
  def currentPage(self):
    return self._currentPage

  @property
  def numOfPages(self):
    return self._numOfPages

  def load(self):
    self._fileObject = open(self._pdfParameter.filename, "rb")
    self._numOfPages = PdfFileReader(self._fileObject).getNumPages()

    # client has to call next() first.
    # the page number begins with 0
    if self._pdfParameter.reverse:
      self._currentPage = self._numOfPages
    else:
      self._currentPage = -1

  def next(self):
    if self._pdfParameter.reverse:
      self._currentPage = self._currentPage - 1
    else:
      self._currentPage = self._currentPage + 1

    if self._currentPage < 0 or self._currentPage >= self._numOfPages:
      return False

    return True