Hi
David,
the
project org.eclipse.mdm.openatfx.mdf generates an ATFX layer
around a given MDF3 or MF4 file, which has to be sorted
(please see the MDF specification for details regarding
sorted MDF files).
Those
ATFX files are usually used for imports into so called
measurement systems which are driven by ODS servers.
Therefore the reading of the measured data may be done by
the ODS server, once the ATFX file has been imported.
However
I made a quick test with one of the MF4 test files (bundled
in this project) and was able to read the stored channel
data.
1.
Is
there an example/test case where the actual measurement
data is read from the file?
o
See
attached file (Example.java), I hope it gets you started
J
o
Within
the ATFX session you may find one or two measurements, the
second one is created one the fly, once needed:
i. „measurement“
will contain for each data group (DGBLOCK) with exactly one
channel group „CGBLOCK“ a so called SubMatrix.
A
ValueMatrix is spanned over the SubMatrix and is used to
read the stored measured data per colum „CNBLOCK“.
ii. „measurement_lookup“
will only be created for channels „CNBLOCK“s which have
lookup tables (value to value mappings, value range tot ext
mappings, etc.).
You
have to follow the same rules to access its data. The given
example should print the values for both measurements. Try
it with your test files…
o
The
library may create additional files next to your MF4 file in
the following cases:
i. Validation
bits of measured data are stored in a non ODS compliant way,
therefore the library exports them into an additional binary
file
ii. Channel
data with a rational conversion can not be represented in an
ODS compliant way, therefore they are fullly calculated and
stored in an additional binary file
2.
I'm
confused about the keys that are used to retrieve
ApplicationElements and InstanceElements from the
ApplicationStruture. Is there some resource describing how
to access the file and where the keys come from? I tried
to compare it to the keys shown by the MDFValidator by
VECTOR but they do not seem to match.
o
See
the comments in example. In short, the keys you see in the
MDFValidator are MDF specific and are reinterpreted and
stored in an ODS compliant way.
3.
I'm
unfamiliar with the ASAM OO-API and I couldn't find a
guide to the API. Also I couldn't find sources and JavaDoc
for the ods-5.3.0.jar to view this information in Eclipse
while looking at the tests.
o
The
full specification may be downloaded for ASAM members for
free: https://www.asam.net/standards/detail/ods/older/
Additional
notes:
·
The
library may not support all possible channel configurations
you may have in your environment (it is not a full
implementation of the MDF specifications)
·
You
may want to write a JNI wrapper for this library
https://www.turbolab.de/mdf_libf.htm
·
You
may use the other project org.eclipse.mdm.mdfsorter to sort
unsorted MDF files
Regards
Viktor
Hi Angelika,
thanks for the quick answer.
Could you tell us which context you are
working?
We are developing a data analysis tool
called
KNIME Analytics Platform. It has a visual interface
where you can build so called workflows that model a data
pipeline with operations on the data modelled as nodes. Some
users from our community would be interested in a node to read
MDF files in our tool and do some analysis on the measurement
data. As our tool is written in Java, I was investigating
possible Java libraries that we could use to read MDF and that
we could integrate.
Are you interested in the openatfx.mdf
code or in the underlaying openatfx driver?
Actually, I'm not 100% sure. If I
understood correctly, openatfx.mdf provides functionality to
read MDF files using the openatfx driver? However, I was
having troubles reading the actual measurement data from the a
MF4 file. I cloned
this repository and had a look at
the test cases. Specifically I have the following questions:
1) Is there an example/test case where the actual measurement
data is read from the file?
2) I'm confused about the keys that are used to retrieve
ApplicationElements and InstanceElements from the
ApplicationStruture. Is there some resource describing how to
access the file and where the keys come from? I tried to
compare it to the keys shown by the
MDFValidator by VECTOR but they do not seem to match.
3) I'm unfamiliar with the ASAM OO-API and I couldn't find a
guide to the API. Also I couldn't find sources and JavaDoc for
the ods-5.3.0.jar to view this information in Eclipse while
looking at the tests.
Thanks for your help,
David
Am 07.03.2019 um 09:39 schrieb Angelika
Wittek, openMDM(R):
Dear David,
yes this is the right place to ask questions about the
Eclipse mdmbl project. Currently we are busy, so an answer
will be delayed up to next week.
Are you interested in the openatfx.mdf code or in the
underlaying openatfx driver? That library is hosted on
sourgeforge by Christian:
https://sourceforge.net/projects/openatfx/
Could you tell us which context you are working? Our
project is associated with the Eclipse openMDM Working Group
and we are always interested about the use cases of our
users.
Thanks
Angelika
--
openMDM(R) EWG product manager
mail: awittek.openMDM@xxxxxxxxxxxxxxxxxx
phone: +49 1577 1900802
Am 06.03.19 um 10:21 schrieb David
Kolb:
Dear MDM|BL Development Team,
I'm a working student at the company KNIME
and I'm currently investigating Java libraries which
provide functionality to read MF4 files. We'd like to
include this functionality into our open source software.
After some search, I stumbled upon:
https://git.eclipse.org/c/mdmbl/org.eclipse.mdm.openatfx.mdf.git/about/
which lead me to this mailing list in the included
NOTICE.txt of the Git repository. As the author of the
project is marked as Christian Rechner, AUDI AG (here), I was confused who to
contact regarding some questions about the usage of the
library. Specifically, I am having troubles reading the
actual numeric content of some MF4 files, finding
examples, and finding documentation about the ASAM OO-API.
If this is not the right place to ask these questions,
could you maybe point me into the right direction?
Otherwise, I would be happy to elaborate on my questions
and very thankful about your support.
Kind regards,
David Kolb
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