From 2c338793429a44d98a5d1b224c410652d8d623bc Mon Sep 17 00:00:00 2001
From: David GAILLETON <david.gailleton@posteo.net>
Date: Mon, 9 Feb 2026 16:33:22 +0100
Subject: [PATCH] 05/ex0

---
 ex5/ex0/stream_processor.py | 160 ++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 ex5/ex0/stream_processor.py

diff --git a/ex5/ex0/stream_processor.py b/ex5/ex0/stream_processor.py
new file mode 100644
index 0000000..f92502e
--- /dev/null
+++ b/ex5/ex0/stream_processor.py
@@ -0,0 +1,160 @@
+from abc import ABC, abstractmethod
+from typing import Any
+from typing_extensions import override
+
+
+class DataProcessor(ABC):
+    @abstractmethod
+    def process(self, data: Any) -> str:
+        pass
+
+    @abstractmethod
+    def validate(self, data: Any) -> bool:
+        pass
+
+    def format_output(self, result: str) -> str:
+        return f"Processed output: {result}"
+
+
+class NumericProcessor(DataProcessor):
+    def process(self, data: Any) -> str:
+        try:
+            return f"{data}"
+        except Exception as err:
+            print(err)
+            return "error"
+
+    def validate(self, data: Any) -> bool:
+        try:
+            for n in data:
+                if type(n).__name__ != "int":
+                    return False
+            return True
+        except Exception:
+            return False
+
+    @override
+    def format_output(self, result: str) -> str:
+        try:
+            to_processed = result.split(", ")
+            res_int: list[int] = []
+            for n in to_processed:
+                n = n.replace("[", "").replace("]", "")
+                if n.isnumeric():
+                    res_int = res_int + [int(n)]
+            avg = sum(res_int) / len(res_int)
+            return f"Processed {len(res_int)} numeric value,\
+ sum={sum(res_int)}, avg={avg:.2f}"
+        except Exception as err:
+            print(f"NumericProcessor / format_output: {err}")
+            return "error"
+
+
+class TextProcessor(DataProcessor):
+    def process(self, data: Any) -> str:
+        return str(data)
+
+    def validate(self, data: Any) -> bool:
+        try:
+            for char in data:
+                if type(char).__name__ != "str":
+                    return False
+            return True
+        except Exception:
+            return False
+
+    @override
+    def format_output(self, result: str) -> str:
+        return f"Processed text: {len(result)}\
+ characters, {len(result.split(' '))} words"
+
+
+class LogProcessor(DataProcessor):
+    def process(self, data: Any) -> str:
+        try:
+            return f"{data[0]}: {data[1]}"
+        except Exception as err:
+            print(err)
+            return "error"
+
+    def validate(self, data: Any) -> bool:
+        try:
+            if len(data) == 2:
+                for n in data:
+                    if type(n).__name__ != "str":
+                        return False
+                return True
+            return False
+        except Exception:
+            return False
+
+    @override
+    def format_output(self, result: str) -> str:
+        try:
+            log_res = result.split(":")[0]
+            if log_res == "ERROR":
+                header = "[ALERT]"
+            elif log_res == "INFO":
+                header = "[INFO]"
+            elif log_res == "SUCCESS":
+                header = "[SUCCESS]"
+            else:
+                header = "[UNKNOWN]"
+            return (
+                f"{header} {result.split(':', 1)[0]}{result.split(':', 1)[1]}"
+            )
+        except Exception as err:
+            print(err)
+            return "error"
+
+
+def class_tester() -> None:
+    print("=== CODE NEXUS - DATA PROCESSOR FOUNDATION ===\n")
+    print("Initializing Numeric Processor...")
+    data = [1, 2, 3, 4, 5]
+    processor = NumericProcessor()
+    res = processor.process(data)
+    is_valid = processor.validate(data)
+    formatted_output = processor.format_output(res)
+    print(f"processing data: {res}")
+    if is_valid:
+        print("Validation: Numeric data verified")
+    else:
+        print("Validation: Invalid numeric data")
+    print(f"Output: {formatted_output}")
+    print("\nInitializing Text Processor...")
+    data = "Hello Nexus World"
+    processor = TextProcessor()
+    res = processor.process(data)
+    is_valid = processor.validate(data)
+    formatted_output = processor.format_output(res)
+    print(f"processing data: {res}")
+    if is_valid:
+        print("Validation: Text data verified")
+    else:
+        print("Validation: Invalid text data")
+    print(f"Output: {formatted_output}")
+    print("\nInitializing Log Processor...")
+    data = ["ERROR", "Connection timeout"]
+    processor = LogProcessor()
+    res = processor.process(data)
+    is_valid = processor.validate(data)
+    formatted_output = processor.format_output(res)
+    print(f"processing data: {res}")
+    if is_valid:
+        print("Validation: Log data verified")
+    else:
+        print("Validation: Invalid log data")
+    print(f"Output: {formatted_output}")
+    print("\n=== Polymorphic Processing Demo ===\n")
+    print(f"Result 1:\
+ {NumericProcessor().format_output('[1, 2, 3]')}")
+    print(f"Result 2:\
+ {TextProcessor().format_output('Hello World !')}")
+    print(f"Result 3:\
+ {LogProcessor().format_output('INFO: level detected: System ready')}")
+    print("\nFoundation systems online. Nexus ready for advanced streams.")
+
+
+if __name__ == "__main__":
+    class_tester()