Builder Pattern

mokth

这是BUILDER PATTERN, 我是用PYTHON 写出一个简单的例子.
http://zh.wikipedia.org/wiki/%E7%94%9F%E6%88%90%E5%99%A8_(%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F)

#director
class FormatText:
    def __init__(self):
        self.builder= MessageBuilder()
   
    def buildMessage(self,header,footer,body):
        self.builder.setHeader( header)
        self.builder.setFooter( footer)
        self.builder.setContent(body)
   
    def getMessage(self):
        return self.builder.getProdcut()
   

#abstract builder  
class Builder(object):
    def setHeader(self,header):
        pass
   
    def setFooter(self,footer):
        pass
   
    def setContent(self,body):
        pass
   
    def getProdcut(self):
        pass
   

#concrete builder   
class MessageBuilder(Builder):
    def setHeader(self,header):
        self.header = header
   
    def setFooter(self,footer):
        self.footer = footer
   
    def setContent(self,body):
        self.body = body
   
    def getProdcut(self):
        product = SimpleText(self.header,self.body,self.footer)
        return product.generateText()

#final product   
class SimpleText:
    def __init__(self,header,footer,body):
        self.header = header
        self.footer = footer
        self.body = body
        
    def generateText(self):
        text = "------header-------\n%s\n-------body-------\n%s\n------footer-------\n%s\n\nthanks.." %(self.header,self.body,self.footer)
        return text
        

#consumer   
format = FormatText()
format.buildMessage("test","hi this is a test.....","ok done")
text =format.getMessage()
print text

[ 本帖最后由 mokth 于 23-11-2008 12:33 AM 编辑 ]