将实现一个接口的Groovy地图转换回地图(Convert Groovy map implementing an interface back to a map)

将实现一个接口的Groovy地图转换回地图(Convert Groovy map implementing an interface back to a map)

在使用闭包映射来实现Groovy中的接口时（如http://groovy.codehaus.org/Groovy+way+to+implement+interfaces ），有什么方法可以在使用后将对象转换回地图as关键字或asType方法来实现接口？

When using a map of closures to implement an interface in Groovy (as in http://groovy.codehaus.org/Groovy+way+to+implement+interfaces) is there any way to convert the object back to a map after using the as keyword or the asType method to implement the interface?

最满意答案

根据您的使用情况，似乎您可以在将其转换为所需的界面之前保留对原始Map的引用。

但是，查看将Map对象转换为接口的源代码（使用Proxy ），看起来您可以通过获取InvocationHandler的委托来重新获取原始地图。

def i = 1 def m = [ hasNext:{ true }, next:{ i++ } ] Iterator iter = m as Iterator def d = java.lang.reflect.Proxy.getInvocationHandler(iter).delegate assert d.is(m)

注意：这取决于Groovy代码的内部结构，所以请自担风险：

Based on your use case it would seem that you could just keep a reference to the original Map before converting it into the needed interface.

However, looking at the source code that converts the Map object into the interface (using a Proxy), it looks like you can just re-retrieve the original map by getting the InvocationHandler's delegate.

def i = 1 def m = [ hasNext:{ true }, next:{ i++ } ] Iterator iter = m as Iterator def d = java.lang.reflect.Proxy.getInvocationHandler(iter).delegate assert d.is(m)

Note: This depends on the internals of the Groovy code so use at your own risk: