从JRuby铸造Java对象 [英] Casting Java Objects From JRuby

问题描述

我在JRuby使用Java库。我从文件中读取一个对象，我需要将它作为一个不同的对象类型传递给第二个构造函数：

  @hmm_model = ObjectInputStream.new（FileInputStream.new（LINGPIPE_MODEL_PATH））
 @tagger = HmmDecoder.new（@hmm_model）
  

@hmm_model是ObjectInputStream类型，需要转换为（HiddenMarkovModel）。显然，这很容易在Java中，它只是：

  @tagger = HmmDecoder.new（（HiddenMarkovModel）@ hmm_model）
  

但是，这当然不适用于JRuby。实际上有没有什么方法来显式地将@hmm_model转换成正确的类型？

解决方案

亮。 JRuby JVM接口足够聪明，可以自我调用，我正在调用构造函数不正确。实际调用是：

  @tagger = HmmDecoder.new（@ hmm_model.readObject（））
  
 
 
 JRuby：c $ c> 
 
 
 
并且JRuby正确处理类型转换为HiddenMarkovModel。 1 
 me：0 
 
I'm working with a Java library in JRuby.  I'm reading an object from a file, and I need to pass it as a different object type to a second constructor:
@hmm_model = ObjectInputStream.new(FileInputStream.new(LINGPIPE_MODEL_PATH))
@tagger = HmmDecoder.new(@hmm_model)
@hmm_model is of type ObjectInputStream, and needs to be cast to (HiddenMarkovModel).  Obviously, that'd be easy in Java, it would just be:
@tagger = HmmDecoder.new((HiddenMarkovModel)@hmm_model)
But, of course, that doesn't work in JRuby.  Is there actually any way to explicitly cast the @hmm_model to be of the correct type?
解决方案
So, I'm not very bright.  The JRuby JVM interface is smart enough to cast itself, I was making the call to the constructor incorrectly.  The actual call is:
@tagger = HmmDecoder.new(@hmm_model.readObject())
and JRuby correctly handles the type conversion to a HiddenMarkovModel.

JRuby: 1
me: 0

                        
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