Reset handler state before reading to avoid any unforseen state accumulation over multiple operations

src/services/excel_handler.py

@@ -86,6 +86,8 @@ class ExcelHandler(MetadataHandler):
             MetadataReadingError: If the workbook is password-protected.
             MetadataNotFoundError: If no properties are found.
         """
+        self.metadata.clear()
+        self.keys_to_delete.clear()
         wb = load_workbook(Path(self.filepath))
         try:
             if wb.security.workbookPassword is not None:
@@ -113,6 +115,7 @@ class ExcelHandler(MetadataHandler):
         Raises:
             MetadataNotFoundError: If no properties are found.
         """
+        self.processed_metadata.clear()
         wb = load_workbook(Path(self.filepath))
         try:
             if wb.properties is None:

src/services/image_handler.py

@@ -90,6 +90,10 @@ class ImageHandler(MetadataHandler):
 
         Uses actual format detection to select the appropriate processor.
         """
+        self.metadata.clear()
+        self.text_keys_to_delete.clear()
+        self.tags_to_delete.clear()
+
         self.detected_format = self._detect_format()
         processor = self.processors.get(self.detected_format)
 
@@ -111,6 +115,8 @@ class ImageHandler(MetadataHandler):
 
         Uses actual format detection to select the appropriate processor.
         """
+        self.processed_metadata.clear()
+        self.clean_pnginfo = None
         # Use cached format if available, otherwise detect
         if not self.detected_format:
             self.detected_format = self._detect_format()

src/services/pdf_handler.py

@@ -71,6 +71,8 @@ class PDFHandler(MetadataHandler):
             MetadataReadingError: If the PDF is encrypted/password-protected.
             MetadataNotFoundError: If no metadata is found in the PDF.
         """
+        self.metadata.clear()
+        self.keys_to_delete.clear()
         with PdfReader(Path(self.filepath)) as reader:
             if reader.is_encrypted:
                 raise MetadataReadingError("File is encrypted.")
@@ -93,6 +95,7 @@ class PDFHandler(MetadataHandler):
         Raises:
             MetadataNotFoundError: If no metadata is found in the PDF.
         """
+        self.processed_metadata.clear()
         with PdfReader(Path(self.filepath)) as reader:
             metadata = reader.metadata
             if metadata is None:

src/services/powerpoint_handler.py

@@ -103,6 +103,8 @@ class PowerpointHandler(MetadataHandler):
         Raises:
             MetadataNotFoundError: If no properties are found.
         """
+        self.metadata.clear()
+        self.keys_to_delete.clear()
         prs = Presentation(str(Path(self.filepath)))
         try:
             if prs.core_properties is None:
@@ -128,6 +130,7 @@ class PowerpointHandler(MetadataHandler):
         Raises:
             MetadataNotFoundError: If no properties are found.
         """
+        self.processed_metadata.clear()
         prs = Presentation(str(Path(self.filepath)))
         try:
             if prs.core_properties is None:

src/services/worddoc_handler.py

@@ -97,6 +97,8 @@ class WorddocHandler(MetadataHandler):
         Raises:
             MetadataNotFoundError: If no properties are found.
         """
+        self.metadata.clear()
+        self.keys_to_delete.clear()
         doc = Document(str(Path(self.filepath)))
         try:
             if doc.core_properties is None:
@@ -122,6 +124,7 @@ class WorddocHandler(MetadataHandler):
         Raises:
             MetadataNotFoundError: If no properties are found.
         """
+        self.processed_metadata.clear()
         doc = Document(str(Path(self.filepath)))
         try:
             if doc.core_properties is None: