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