jython-dev

[Jython-dev] distribution of jython that includes the python libraries in a ja r?

[Phil S. <psu...@es...>]

I'd like to be able to easily bundle jython with other applications so that
I can use the full power of python alongside my java apps. I'd like to be
able to do this without requiring users to perform an installation of jython
- it should be enough just to include the necessary jars. 
 
Right now, I can include jython.jar with an app and I get lots of
functionality, but I can't access the python libraries. I would _love_ to be
able to include the standard libraries either within jython.jar itself or in
an extra libary (though everything in one jar is definitely the sweetest
solution.
 
Has this been done already but I'm just missing it? If no, can you give me
some pointers on where to dive into the code to make this happen?
 
- Phil Surette
 

Re: [Jython-dev] distribution of jython that includes the python libraries in a ja r?

[Titus B. <ti...@ca...>]

-> I'd like to be able to easily bundle jython with other applications so that
-> I can use the full power of python alongside my java apps. I'd like to be
-> able to do this without requiring users to perform an installation of jython
-> - it should be enough just to include the necessary jars. 
->  
-> Right now, I can include jython.jar with an app and I get lots of
-> functionality, but I can't access the python libraries. I would _love_ to be
-> able to include the standard libraries either within jython.jar itself or in
-> an extra libary (though everything in one jar is definitely the sweetest
-> solution.
->  
-> Has this been done already but I'm just missing it? If no, can you give me
-> some pointers on where to dive into the code to make this happen?

If you already have a Jython app installed, you can create a frozen
distribution & send it all out in a .jar file; that's relatively easy,
in fact: the command

	jythonc --all -j out.jar startProgram.py

should bundle up everything into 'out.jar'.

--titus

Re: [Jython-dev] distribution of jython that includes the python libraries in a ja r?

[Ted B. <te...@et...>]

On Monday 10 September 2001 13:03, Phil Surette wrote:
> I'd like to be able to easily bundle jython with other applications so that
> I can use the full power of python alongside my java apps. I'd like to be
> able to do this without requiring users to perform an installation of
> jython - it should be enough just to include the necessary jars.
>
> Right now, I can include jython.jar with an app and I get lots of
> functionality, but I can't access the python libraries. I would _love_ to
> be able to include the standard libraries either within jython.jar itself
> or in an extra libary (though everything in one jar is definitely the
> sweetest solution.
>
> Has this been done already but I'm just missing it? If no, can you give me
> some pointers on where to dive into the code to make this happen?
>
> - Phil Surette

I am shipping the standard modules as part of my application jar.  I list 
jython.jar as a required extension ( placed in lib\ext ) and then append 
"/fully qualified pathname to my jar!Lib" to the sys.path of the interpreter.

Here's the code I use to do so.  Just make a call like this:

addDirToInterpPath( myInterp, "Lib" );

---

  void addDirToInterpPath( org.python.util.PythonInterpreter interp, String 
subdir )
  {
    interp.exec( "import sys" );

    // leading and trailing slashes required to get the URL for a directory.
    if ( !subdir.startsWith( "/" ) )
      subdir = "/"+subdir;
    if ( !subdir.endsWith( "/" ) )
      subdir = subdir + "/";
    
    // get the URL
    java.net.URL u = MainFrame.class.getResource( subdir );

    // make the URL jython friendly
    StringBuffer buf = new StringBuffer( u.toString() );

    // replace the !/ pair with ! so jython can find the directory
    int index = buf.toString().indexOf( "!/" );
    if ( index > -1 )
    {
      buf.replace( index, index + 2, "!" );
    }

    // remove the protocol part of the URL
    buf.replace( 0, buf.toString().lastIndexOf( ":" ) + 1, "" );
    if ( buf.toString().endsWith( "/" ) )
      buf.setLength( buf.toString().length() -1 );

    // append the path to sys.path
    interp.exec( "sys.path.append( '" + buf.toString() + "' )" );
  }

---

ted

Re: [Jython-dev] distribution of jython that includes the python libraries in a ja r?

[<bc...@wo...>]

[Ted Berg]

This is just a very minor suggestion to your perfectly valid example.

>I am shipping the standard modules as part of my application jar.  I list 
>jython.jar as a required extension ( placed in lib\ext ) and then append 
>"/fully qualified pathname to my jar!Lib" to the sys.path of the interpreter.
>
>Here's the code I use to do so.  Just make a call like this:
>
>addDirToInterpPath( myInterp, "Lib" );
>
>---
>
>  void addDirToInterpPath( org.python.util.PythonInterpreter interp, String 
>subdir )
>  {
>    interp.exec( "import sys" );

You don't need this. See below.

>    // leading and trailing slashes required to get the URL for a directory.
>    if ( !subdir.startsWith( "/" ) )
>      subdir = "/"+subdir;
>    if ( !subdir.endsWith( "/" ) )
>      subdir = subdir + "/";
>    
>    // get the URL
>    java.net.URL u = MainFrame.class.getResource( subdir );
>
>    // make the URL jython friendly
>    StringBuffer buf = new StringBuffer( u.toString() );
>
>    // replace the !/ pair with ! so jython can find the directory
>    int index = buf.toString().indexOf( "!/" );
>    if ( index > -1 )
>    {
>      buf.replace( index, index + 2, "!" );
>    }
>
>    // remove the protocol part of the URL
>    buf.replace( 0, buf.toString().lastIndexOf( ":" ) + 1, "" );
>    if ( buf.toString().endsWith( "/" ) )
>      buf.setLength( buf.toString().length() -1 );
>
>    // append the path to sys.path
>    interp.exec( "sys.path.append( '" + buf.toString() + "' )" );

Calling exec() is quite slow compared to calling the API directly:

     PySystemState sys = Py.getSystemState();
     sys.path.append(new PyString(buf.toString()));

OTOH when addDirToInterpPath() is only called once it hardly matter at
all except to my sense of rightness.

Thanks for posting your example.

regards,
finn

Re: [Jython-dev] distribution of jython that includes the python libraries in a ja r?

[Ted B. <te...@et...>]

On Tuesday 11 September 2001 12:43, Finn Bock wrote:
> [Ted Berg]
>
> This is just a very minor suggestion to your perfectly valid example.

<snip>

>
> Calling exec() is quite slow compared to calling the API directly:
>
>      PySystemState sys = Py.getSystemState();
>      sys.path.append(new PyString(buf.toString()));
>
> OTOH when addDirToInterpPath() is only called once it hardly matter at
> all except to my sense of rightness.
>
> Thanks for posting your example.

Your sense of rightness can rest knowing that all is well ( at least in this 
respect ) with one application. :)

Thank you for your suggestion, it is definitely a more elegant soluion.

ted