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# document_loader.py
import os
from typing import Optional
class DocumentLoader:
def __init__(self):
self.uploaded_file = None
def load_file(self, file_path: str) -> Optional[str]:
"""
Load the uploaded PDF file and validate it
Returns the file path if valid, None otherwise
"""
if not file_path:
return None
if not file_path.lower().endswith('.pdf'):
raise ValueError("Only PDF files are supported")
if not os.path.exists(file_path):
raise FileNotFoundError("File does not exist")
self.uploaded_file = file_path
return file_path |