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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