[英]“Key-Value Coding” for Java
In Objective-C on Apple there is something called "Key-Value Coding" that allows you to traverse the object graph using strings similar to filesystem paths. 在Apple上的Objective-C中,有一种称为“键值编码”的东西,它允许您使用类似于文件系统路径的字符串遍历对象图。 There's an informal protocol (ie interface) that allows objects to return values based on the "key" they're asked for.
有一个非正式的协议(即接口),允许对象根据他们要求的“密钥”返回值。 eg The default is to return the value of a field named by the key, while relational collections like NSDictionaries can implement more interesting behavior.
例如,默认是返回由键命名的字段的值,而像NSDictionaries这样的关系集合可以实现更有趣的行为。
Pseudo code example: 伪代码示例:
foo.bar = new baz(); foo.bar.mymap = new map(); foo.bar.mymap['bom'] = 2; foo.valueForKeyPath("bar.mymap.bom") # 2
Is there anything like this for Java? Java有这样的东西吗? It would be easy enough to implement, but I thought I'd look first.
这很容易实现,但我想我先看看。
PropertyUtils.getProperty ,从Apache的BeanUtils的图书馆,这是否对JavaBean属性。
Hmm, well, in case anyone else has this question, it looks like MVEL is a good bet: 嗯,好吧,万一其他人有这个问题,看起来MVEL是一个不错的选择:
http://mvel.codehaus.org/Property+Navigation http://mvel.codehaus.org/Property+Navigation
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