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'''
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桥接模式（Bridge Pattern）可以将抽象与实现解耦，让它们可以独立变化。
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这在处理多种分类的书籍时特别有用，比如你想在不同的平台上展示这些书籍，同时这些书籍还分属不同的分类。
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下面是一个简单的实现代码示例，展示如何使用桥接模式来构建书城的书籍分类与展示平台：
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'''
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# 定义书籍接口
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class IBook:
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def get_title(self):
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pass
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def get_author(self):
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pass
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# 具体书籍实现
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class NovelBook(IBook):
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def __init__(self, title, author):
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self.title = title
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self.author = author
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def get_title(self):
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return self.title
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def get_author(self):
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return self.author
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# 定义抽象分类
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class BookCategory:
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def __init__(self, name):
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self.name = name
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self.books = []
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def add_book(self, book):
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self.books.append(book)
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def get_books(self):
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return self.books
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# 定义抽象展示平台
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class DisplayPlatform:
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def display(self, book):
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pass
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# 具体展示平台实现
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class WebDisplayPlatform(DisplayPlatform):
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def display(self, book):
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return f"On the web: {book.get_title()} by {book.get_author()}"
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class MobileDisplayPlatform(DisplayPlatform):
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def display(self, book):
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return f"On mobile: {book.get_title()} by {book.get_author()}"
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# 桥接类，将分类与展示平台连接起来
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class BookShop:
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def __init__(self, category, platform):
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self.category = category
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self.platform = platform
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def show_books(self):
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for book in self.category.get_books():
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print(self.platform.display(book))
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# 客户端代码
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if __name__ == "__main__":
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# 创建书籍
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novel1 = NovelBook("The Great Gatsby", "F. Scott Fitzgerald")
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novel2 = NovelBook("1984", "George Orwell")
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# 创建分类
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fiction_category = BookCategory("Fiction")
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fiction_category.add_book(novel1)
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fiction_category.add_book(novel2)
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# 创建展示平台
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web_platform = WebDisplayPlatform()
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mobile_platform = MobileDisplayPlatform()
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# 创建书城并展示书籍
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web_bookshop = BookShop(fiction_category, web_platform)
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web_bookshop.show_books()
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mobile_bookshop = BookShop(fiction_category, mobile_platform)
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mobile_bookshop.show_books()
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'''
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在这个示例中，IBook 是一个接口，定义了书籍应有的行为（比如获取标题和作者）。NovelBook 是一个具体书籍类，实现了 IBook 接口。BookCategory 是一个书籍分类类，它可以包含多个书籍实例。
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DisplayPlatform 是一个抽象展示平台类，定义了如何展示书籍。WebDisplayPlatform 和 MobileDisplayPlatform 是具体展示平台类，分别实现了 DisplayPlatform 接口，以提供不同的展示方式。
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BookShop 是一个桥接类，它将书籍分类与展示平台连接起来，通过 show_books 方法可以展示分类中的所有书籍。
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''' |
