Created
December 25, 2019 07:42
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Chain of responsibility design pattern in python
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| class ReportFormat(object): | |
| PDF = 0 | |
| TEXT = 1 | |
| class Report(object): | |
| def __init__(self, format_): | |
| self.title = 'title' | |
| self.format_ = format_ | |
| class Handler(object): | |
| def __init__(self): | |
| self.nextHandler = None | |
| def handle(self, req): | |
| self.nextHandler.handle(req) | |
| class PdfHandler(Handler): | |
| def handle(self, req): | |
| if req.format_ == ReportFormat.PDF: | |
| print(f'pdf handler: {req.title}') | |
| else: | |
| super().handle(req) | |
| class TextHandler(Handler): | |
| def handle(self, req): | |
| if req.format_ == ReportFormat.TEXT: | |
| print(f'text handler: {req.title}') | |
| else: | |
| super().handle(req) | |
| class ErrorHandler(Handler): | |
| def handle(self, req): | |
| print("Invalid request") | |
| if __name__ == '__main__': | |
| report = Report(ReportFormat.TEXT) | |
| pdf_handler = PdfHandler() | |
| text_handler = TextHandler() | |
| pdf_handler.nextHandler = text_handler | |
| text_handler.nextHandler = ErrorHandler() | |
| pdf_handler.handle(report) |
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