CODESAMPLE
Facade - Python
The Facade pattern provides a simplified interface to a complex subsystem. It defines a high-level interface that hides the intricacies of the underlying components, making the system easier to use. This example demonstrates a simple media player facade, abstracting away the complexities of handling different media types (audio and video). The MediaFacade class provides a single play method, handling the instantiation and interaction with the appropriate media player based on the file extension. This approach aligns with Python’s emphasis on readability and reducing complexity through abstraction.
# Subsystem classes
class AudioPlayer:
def play(self, filename):
print(f"Playing audio file: {filename}")
class VideoPlayer:
def play(self, filename):
print(f"Playing video file: {filename}")
class FileTypeChecker:
def is_audio(self, filename):
return filename.endswith(".mp3") or filename.endswith(".wav")
def is_video(self, filename):
return filename.endswith(".mp4") or filename.endswith(".avi")
# Facade class
class MediaFacade:
def __init__(self):
self.audio_player = AudioPlayer()
self.video_player = VideoPlayer()
self.file_checker = FileTypeChecker()
def play(self, filename):
if self.file_checker.is_audio(filename):
self.audio_player.play(filename)
elif self.file_checker.is_video(filename):
self.video_player.play(filename)
else:
print(f"Unsupported file type: {filename}")
# Client code
if __name__ == "__main__":
facade = MediaFacade()
facade.play("song.mp3")
facade.play("movie.mp4")
facade.play("document.pdf")