start implementation on new architecture

sia/write_entry.py

@@ -0,0 +1,54 @@
+from datetime import datetime
+import xml.etree.ElementTree as ET
+
+from .entry import Entry
+from .util import escape_text_for_xml
+
+class WriteEntry(Entry):
+    """
+    Entry type for writing content to standard output.
+    
+    Attributes:
+        content: Text content to write to stdout
+        io_buffer: Buffer to use for IO operations
+        _written: Whether the content has been written
+    """
+    
+    def __init__(self, content: str, io_buffer, id: str, timestamp: datetime):
+        """
+        Initialize a new write entry.
+        
+        Args:
+            content: Text to write to stdout
+            io_buffer: Buffer to use for IO operations
+            id: Unique identifier for this entry
+            timestamp: Creation timestamp for this entry
+        """
+        super().__init__(id, timestamp)
+        self.content = content
+        self.io_buffer = io_buffer
+        self._written = False
+        
+    def update(self) -> None:
+        """
+        Write the content to stdout if not already written.
+        Uses the provided IO buffer for the actual write operation.
+        """
+        if not self._written:
+            self.io_buffer.write(self.content)
+            self._written = True
+
+    def generate_context(self) -> ET.Element:
+        """
+        Generate an XML Element representing this write entry.
+        
+        Returns:
+            ET.Element: XML element containing the entry's data
+        """
+        # Create root element
+        element = ET.Element("write_stdout", {"id": self.id})
+        
+        # Add content as CDATA or escaped text
+        element.text = escape_text_for_xml(self.content)
+            
+        return element