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Transforming JSON with XSLT using SaxonEE and Python

I am attempting to write a Python script that transforms JSON to a text file (CSV) with XSLT.
With saxon-ee-10.5.jar, I can successfully perform the desired transformation by running the following command (Windows 10):
java -cp saxon-ee-10.5.jar com.saxonica.Transform -it -xsl:styling.xslt -o:result.csv
How can I achieve the same result by using Python? I have been trying with Saxon-EE/C, but I am not sure if what I want to happen is possible.
Here is an example of what I have tried so far. My XSLT already defines an $in parameter for the initial.json file, but the PyXslt30Processor.apply_templates_returning_file() seems to require a call to PyXslt30Processor.set_initial_match_selection(), of which I am not sure if non-XML files can be passed.
from saxonc import PySaxonProcessor
with PySaxonProcessor(license=True) as proc:
xslt30proc = proc.new_xslt30_processor()
xslt30proc.set_initial_match_selection(file_name='initial.json')
content = xslt30proc.apply_templates_returning_file(
stylesheet_file='styling.xslt',
output_file='result.csv'
)
print(content)
Is what I want to accomplish possible with Saxon-EE/C, or should I try techniques of calling Java from Python?

I think you want to use call_template... instead of apply-templates, e.g. https://www.saxonica.com/saxon-c/doc/html/saxonc.html#PyXslt30Processor-call_template_returning_file with
xslt30proc.call_template_returning_file(None, stylesheet_file='styling.xslt',
output_file='result.csv'
)
Using None as the template name should be identical to using -it on the command line, i.e. start by calling the template named xsl:initial-template.
Don't use xslt30proc.set_initial_match_selection in that case.
It might, however, help, to set xslt30proc.set_cwd('.') before the call_template_returning_file call.

Is there a Java code to convert csv files into pbix?

We need a Java code which automatically converts csv files into pbix files, so they can be opened and further worked on in the PowerBI Desktop. Now, I know PowerBI offers this super cool feature, which converts csv files and many other formats into pbix manually. However, we need a function which automatically converts our reports directly into pbix, so that no intermediate files need to be created and stored somewhere.
We have already been able to develop a function with three parameters: The first one corresponds to the selected report, from our database; the second corresponds to the directory, in which the converted report should be generated; and finally the third one is the converted output file itself. The two first parameters work well and the code is able to generate a copy of any report we select into any directory we select. However, it is able to generate csv files only. Any other format will have the same size as the csv and won't be able to open.
This is what we've tried so far for the conversion part of the code:
Util.writeFile("C:\\" + "test.csv", byteString);
The above piece of code works just fine, however csv is not what we wanted, the original reports are already in csv format anyway.
Util.writeFile("C:\\" + "test.pbix", byteString);
Util.writeFile("C:\\" + "test.pdf", byteString);
Util.writeFile("C:\\" + "test.xlsx", byteString);
Each of the three lines above generates one file in the indicated format, however each of the generated files are just as large as its corresponding csv(but should be much larger) and therefore are unable to open.
File file = new File("C:\\" + "test1.csv");
File file2 = new File("C:\\" + "test1.pbix");
file.renameTo(file2);
The above piece of code does not generate any file at all, but I thought it could be worth mentioning it, as it doesn't throw any exception at all either.
P.S. We would also be interested in a java code which converts csv in any other BI reporting software besides PowerBI, like Tableau, BIRT, Knowage, etc.
P.S.2 The first piece of code uses objects of a class (sailpoint.tools.Util) which is apparently only available for those who have access to Sailpoint.

File wildcard use *

I am trying to read a file which has name: K2ssal.timestamp.
I want to handle the time stamp part of the file name as wildcard.
How can I achieve this ?
tried * after file name but not working.
var getK2SSal: Iterator[String] = Source.fromFile("C://Users/nrakhad/Desktop/Work/Data stage migration/Input files/K2Ssal.*").getLines()

You can use Files.newDirectoryStream with directory + glob:
import java.nio.file.{Paths, Files}
val yourFile = Files.newDirectoryStream(
Paths.get("/path/to/the/directory"), // where is the file?
"K2Ssal.*" // glob of the file name
).iterator.next // get first match

Misconception on your end: unless the library call is specifically implemented to do so, using a wildcard simply doesn't work like you expect it to.
Meaning: a file system doesn't know about wildcards. It only knows about existing files and folders. The fact that you can put * on certain commands, and that the wildcard is replaced with file names is a property of the tool(s) you are using. And most often, programming APIs that allow you to query the file system do not include that special wild card handling.
In other words: there is no sense in adding that asterisk like that.
You have to step back and write code that actively searches for files itself. Here are some examples for scala.

You can read the directory and filter on files based upon the string.
val l = new File("""C://Users/nrakhad/Desktop/Work/Data stage migration/Input files/""").listFiles
val s = l.filter(_.toString.contains("K2Ssal."))

Capture generated output file path and name using CSSDK

We are in the process of converting over to using the XSLT compiler for page generation. I have a Xalan Java extention to exploit the CSSDK and capture some meta data we have stored in the Extended Attributes for output to the page. No problems in getting the EA's rendered to the output file.
The problem is that I don't know how to dynamically capture the file path and name of the output file.
So just as POC, I have the CSVPath hard coded to the output file in my Java extension. Here's a code sample:
CSSimpleFile sourceFile = (CSSimpleFile)client.getFile(new CSVPath("/some-path-to-the-output.jsp"));
Can someone point me in the CSSDK to where I could capture the output file?

I found the answer.
First, get or create your CSClient. You can use the examples provided in the cssdk/samples. I tweaked one so that I captured the CSClient in the method getClientForCurrentUser(). Watch out for SOAP vs Java connections. In development, I was using a SOAP connection and for the make_toolkit build, the Java connection was required for our purposes.
Check the following snippet. The request CSClient is captured in the static variable client.
CSSimpleFile sourceFile = (CSSimpleFile)client.getFile(new CSVPath(XSLTExtensionContext.getContext().getOutputDirectory().toString() + "/" + XSLTExtensionContext.getContext().getOutputFileName()));

PHP Problem : filesize() return 0 with file containing few data?

I use PHP to call a Java command then forward its result into a file called result.txt. For ex, the file contains this:
"Result is : 5.0"
but the function filesize() returns 0 and when I check by 'ls -l' command it's also 0. Because I decide to print the result to the screen when file size != 0 so nothing is printed. How can I get the size in bit ? or another solution available?

From the docs, when you call filesize, PHP caches this result in the stat cache.
Have you tried clearing the stat cache?
clearstatcache();
If it does not work, possible workaround is to open the file, seek to its end, and then use ftell.
$fp = fopen($filename, "rb");
fseek($fp, 0, SEEK_END);
$size = ftell($fp);
fclose($fp);
If you are actually planning to display the output to the user, you can instead read the entire file and then strlen.
$data = file_get_contents($filename);
$size = strlen($data);

Which function do you use ?
Because exec() can directly assign result to a variable, so maybe there's no need to save output to a file, if you just want to load it in PHP.

You say:
I use PHP to call a Java command then
forward its result into a file called
result.txt.
Who does the result writing?
1.The JAVA programm?
2.Do you catch the output in PHP and write it to the file.
3.Do you just redirect the output from command line?
If 1 and 3 you might have a delay between when the result is written in the file so, practically, when you read the file in PHP, if you don't wait for the execution to finish, you read it befor it even was written with the result.