Re: [Jython-users] Re: access to .py's in jars

[D-Man <ds...@ri...>]

On Mon, May 21, 2001 at 02:56:52PM -0700, Harlan Hile wrote:
| > Date: Fri, 18 May 2001 23:21:11 -0400
| > From: D-Man <ds...@ri...>
| > You only need the @sig stuff if you want to access the _classes_ in
| > the python module from a java class.  The limitation to classes only
| > (and not module-level stuff) is a result of java.
| 
| So, what i've ended up doing is writing a small bit of java for the module
| level stuff.. some constants and a few static methods.  i have methods
| that return the result of calling the constructors of the classes i have,
| which are written in python and then jythonc'd.  
| This seems to work pretty well, but I had to make the constructors of the
| classes accessible from java, which means i needed to make them inherit
| from a java class.  just having them inherit from Object didnt seem to
| work, so they inherit from the classes i'm trying to wrap, which isnt
| exactly what should happen, but it works OK.

Could you share some of that python code?

The following code works fine for me:

========== Foo.py ==============
import java

class Foo( java.lang.Object ) :
    def __init__( self ) :
        """
        @sig public Foo()
        """
        print "Foo.__init__"


========== Bar.java ===========
class Bar
{
    public static void main( String[] argv )
    {
        System.out.println( "main ..." ) ;
        Foo obj = new Foo() ;
        System.out.println( "end of main" ) ;
    }
}


====== shell (bash from cygwin on win2k) =======
$ jythonc Foo.py
<jythonc output>
$ javac2 -classpath .\;jpywork\;d:/apps/jython-2.0/jython.jar Bar.java
$ java2 -classpath .\;jpywork\;d:/apps/jython-2.0/jython.jar Bar
main ...
Foo.__init__
end of main
$


In this message you said that the java code must access the python
code.  In that case the @sig thing is needed.  As you can see in the
example, the @sig is rather simple -- it is placed in the method's
docstring and contains the java signature that jythonc should
generate.

-D