Create data/document_loader.py

data/document_loader.py

@@ -0,0 +1,24 @@
+# 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