<div dir="ltr">Ok, thanks. I will consider this for some of my future weekend-playtime-programming days. Yes, I'm a masochist.<div><br></div><div>Are there other typemaps needed that would further strengthen the Java api support?</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jun 3, 2023 at 11:03 AM Even Rouault <<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p><br>
</p>
<div>Le 03/06/2023 à 17:45, Barry DeZonia a
écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">Thanks Even.
<div><br>
</div>
<div>I might be able to find some time to do the SWIG work
depending upon the amount of development time needed. I am a
long time developer with experience in Java, C, and C++ (but
have not used SWIG before). Is it just a few signatures I need
to write or do I need to write full support for a
GDALDimension class? Can you comment on this?</div>
</div>
</blockquote>
<p>Yes this is "just" a few signatures to map a C array of
(existing) GDALDimensionH objects to a vector of Java counterpart
org.gdal.gdal.Dimension objects. The org.gdal.gdal.Dimension class
already exists, with a "Dimension(long cPtr, boolean cMemoryOwn)"
constructor taking the value of the underlying C pointer as a Java
long. The cMemoryOwn boolean should probably be passed to true in
that context, since the C GDALDimensionH objects need to be freed
at the finalization of the Java Dimension object. This is really
about glueing stuff, but that said writing SWIG typemaps is a
whole adventure in itself... You may find relevant documentation
at
<a href="https://www.swig.org/Doc4.1/SWIGDocumentation.html#Java_typemaps" target="_blank">https://www.swig.org/Doc4.1/SWIGDocumentation.html#Java_typemaps</a>
. The hint I gave for the existing closest typemap should
hopefully put you on the right track, or at least as close as
possible. <br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>Am I right in understanding that, as of the current Java
implementation, one really can't use MDArrays for much? Like
if I can't find the number of (... z planes, t steps,
channels, etc.) of data I will not be able to reconstruct the
data?</div>
</div>
</blockquote>
<p>Yes the multidim API is probably currently hardly usable outside
C, C++ and Python due to the lack of a few critical typemaps for
the other languages.<br>
</p>
<p>Even<br>
</p>
<blockquote type="cite"><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Jun 3, 2023 at 6:09 AM
Even Rouault <<a href="mailto:even.rouault@spatialys.com" target="_blank">even.rouault@spatialys.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Barry,</p>
<p>This method is indeed not available currently in the Java
bindings. It is only available currently in the Python
bindings (see
<a href="https://github.com/OSGeo/gdal/blob/master/swig/include/MultiDimensional.i#L159" target="_blank">https://github.com/OSGeo/gdal/blob/master/swig/include/MultiDimensional.i#L159</a>
) , since it requires writing a specific SWIG typemap for
each binding language when a method returns (or takes as
argument) a new non-primitive type such as here, with an
array of dimensions. The closest existing Java typemap I
found that can be used to take inspiration from is
<a href="https://github.com/OSGeo/gdal/blob/master/swig/include/java/typemaps_java.i#L235" target="_blank">https://github.com/OSGeo/gdal/blob/master/swig/include/java/typemaps_java.i#L235</a>
but there would be changes to call the "Dimension(long
cPtr, boolean cMemoryOwn)" constructor. Whether you want
to try to tackle that yourself or not, you may create a
ticket about that</p>
<p>Even<br>
</p>
<div>Le 03/06/2023 à 09:09, Barry DeZonia a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">On a related note is the Java api code in a
public repo somewhere? It would be helpful to look at
that code sometimes. (Like is GetDimensions() present in
the Java code but not exposed as a public method?)</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Jun 3, 2023 at
12:18 AM Barry DeZonia <<a href="mailto:bdezonia@gmail.com" target="_blank">bdezonia@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote">
<div dir="ltr">Hi all,
<div><br>
</div>
<div>I have access to an MDArray. I am trying to
find its dimensions. In the C++ API I can see that
GDALMDArray has a method called GetDimensions() to
find the info I need. But I am programming in Java
and the Java API does not show such a call for
MDArray. Is there some way in Java to find the
info I need?</div>
</div>
</blockquote>
</div>
<br>
<fieldset></fieldset>
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<pre cols="72">--
<a href="http://www.spatialys.com" target="_blank">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
</div>
</blockquote>
</div>
</blockquote>
<pre cols="72">--
<a href="http://www.spatialys.com" target="_blank">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
</div>
</blockquote></div>