Re: Jython buffer protocol

Stefan:

I've added a method to get a ByteBuffer and one for testing the presence 
of array access. I've implemented this in the base classes we use to add 
buffers, and I've used it in core objects where previously I used 
PyBuffer.Pointer.

Rather than push this to the project repository immediately, I've put it 
here for comment:
https://bitbucket.org/tournesol/jython-ja/commits/330839dc597a4ba3cb8168e8bd859ad91b9f4dec

I think BaseBuffer needs refactoring now to separate the layer that 
assumes a real backing array from a base that doesn't. For now I'm 
minimising the changes.

I've never really settled in my mind how I should deal with arrays of 
types other than byte. I keep looking at ByteBuffer.getInt() etc. and at 
IntBuffer, thinking those should be some sort of model. Looking at how 
PyArray works, it almost seems that also should be based on the 
sub-classes of java.nio.Buffer. I think a proper, typed solution would 
make the itemsize property unnecessary. Do you have any thoughts about 
itemsize and non-byte data?

Jeff Allen

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