Re: [jruby-user] JRuby class arguments

On 11/18/07, Patrick Logan <patrickdlogan@xxxxxxxxx> wrote:
> I'm trying to use JXPath and JRuby. To do so I need to provide JXPath
> with a Java class that is the superclass of all JRuby instances. For
> example in the Jython code below this is the Java class called
> PyInstance.
>
> I also need to provide JXPath with a class defined in JRuby that
> implements a Java interface. Note, I do not need to pass to Java an
> instance of this class. Rather I need to pass Java the class itself.
> See the Python code below where the register method is given the
> arguments PyInstance and JythonPropertyHandler.
>
> Further down is the equivalent JRuby code with a couple of question
> marks for filling in these missing arguments. Can this be done in
> JRuby yet?
>
> * JYTHON EXAMPLE *
>
> class JythonPropertyHandler (DynamicPropertyHandler):
>     def getPropertyNames (self, py_object):
>         keys = py_object.__dict__.keys()
>         return jarray.array(keys, String)
>     def getProperty(self, py_object, property):
>         if py_object.__dict__.has_key(property):
>             return py_object.__dict__[property]
>         else:
>             return None
>     def setProperty(self, py_object, property, value):
>         py_object.__dict__[property] = value
>
> def registerJythonPropertyHandler():
>     JXPathIntrospector.registerDynamicClass(PyInstance, JythonPropertyHandler)
>
> *****************
> * JRUBY EXAMPLE *
>
> class JRubyPropertyHandler
>   include org.apache.commons.jxpath.DynamicPropertyHandler
>
>   def getPropertyNames(robject)
>     return robject.instance_variables.to_java
>   end
>
>   def getProperty(robject, property)
>     if robject.instance_variables.include?(property)
>       robject.instance_variable_get(property)
>     else
>       nil
>     end
>   end
>
>   def setProperty(robject, property, value)
>     robject.instance_variable_set(property, value)
>   end
>
>   def JRubyPropertyHandler.register()
>     introspector = org.apache.commons.jxpath.JXPathIntrospector
>     introspector.registerDynamicClass(???, ???)
>   end
> end
>

Perhaps this snippet helps?

$ bin/jruby -S irb
irb(main):001:0> class Foo
irb(main):002:1> include java.lang.Runnable
irb(main):003:1> end
=> Foo
irb(main):004:0> Foo.new.java_class
=> $Proxy7
irb(main):005:0>

/Nick

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