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[Octave-bug-tracker] [bug #41239] Dot notation for accessing Java static

From: Rik
Subject: [Octave-bug-tracker] [bug #41239] Dot notation for accessing Java static class fields
Date: Wed, 15 Jan 2014 19:18:41 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0

Update of bug #41239 (project octave):

              Item Group:              Regression => Matlab Compatibility   
                  Status:                    None => Postponed              
                 Summary: java_get/-set removed in dev (4.1.0+) w/o
replacement for static fields => Dot notation for accessing Java static class


Follow-up Comment #1:

There are two parts to this.  Eventually we will have Matlab compatibility. 
and in particular the section "Accessing Data from a Static Field" for the way
things will work.

For reading a static class value Matlab supports standard dot notation such

int_type = java.lang.Integer.TYPE

This sort of dot notation should be possible when classdef support is
available, but that is a ways off (4.2 release).

Note that in Matlab reading a class value is possible using the notation
above, but writing to a class value *always* requires creating an instance of
the class first and then assigning to that instance.

In Octave, reading and writing of static class values is already supported
with this two step approach.  An example of reading the TYPE field is

jint = javaObject ("java.lang.Integer", 1);
int_type = jint.TYPE;
ans = int

Changing your example over to the supported syntax

obj = javaObject ("org.apache.poi.ss.usermodel.Cell");
ctype(1) = obj.CELL_TYPE_NUMERIC;

And it may not even require the instantiation of the object "obj" because you
may already have an instance of the class in the previous code.

This style of code for reading is perfectly acceptable Matlab syntax so it
will not go away even when 4.2 is released.  If you want to change over code
to use the two-step read sequence you can then have your choice to update it
to dot notation in 4.2 or just leave it as is because it works.


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