file_name_to_id error

[fanchyna]

In this case, I put a pdf file named WuJWEBSCI2012-crawling.pdf in the repository, and configures PDFMEF to load from the file system, I got the following error. It looks like that the current code expects file names constructed by numerical characters but this is not the case in general.

Traceback (most recent call last):
  File "main.py", line 140, in <module>
    ids = wrapper.get_document_ids()
  File "/home/jxw394/github/pdfmef/src/extractor/python_wrapper/wrappers.py", line 75, in get_document_ids
    ids.append(utils.file_name_to_id(docPath[docPath.rfind('/') + 1 : docPath.rfind('.pdf') + 4]))
  File "/home/jxw394/github/pdfmef/src/extractor/python_wrapper/utils.py", line 10, in file_name_to_id
    return int(ID)
ValueError: invalid literal for int() with base 10: 'WuJWEBSCI2012-crawling'