davisusanibar commented on a change in pull request #125:
URL: https://github.com/apache/arrow-cookbook/pull/125#discussion_r788040474



##########
File path: java/ext/javadoctest.py
##########
@@ -0,0 +1,64 @@
+from sphinx.ext.doctest import *
+from sphinx.locale import __
+import subprocess
+from subprocess import Popen,PIPE
+import os
+
+class JavaTestDirective(TestDirective):
+    pass
+
+class JavaDocTestBuilder(DocTestBuilder):
+    """
+    Runs java test snippets in the documentation.
+    """
+    name = 'javadoctest'
+    epilog = __('Java testing of doctests in the sources finished, look at the 
'
+                'results in %(outdir)s/output.txt.')
+    def compile(self, code: str, name: str, type: str, flags: Any, 
dont_inherit: bool) -> Any:
+        # go to project that contains all your arrow maven dependencies
+        cwd = os.getcwd()
+        os.chdir('./source/demo')
+
+        # create list of all arrow jar dependencies
+        proc_mvn_dependency = subprocess.Popen(['mvn', '-q', 
'dependency:build-classpath', '-DincludeTypes=jar', 
'-Dmdep.outputFile=.cp.tmp'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, 
text=True)
+        stdout_mvn, stderr_mvn = proc_mvn_dependency.communicate()
+        if not os.path.exists('.cp.tmp'):
+            raise RuntimeError(__('invalid process to create jshell 
dependencies library'))
+
+        # get list of all arrow jar dependencies
+        proc_get_dependency = subprocess.Popen(['cat', '.cp.tmp'], 
stdout=subprocess.PIPE, text=True)
+        stdout_dependency, stderr_dependency = 
proc_get_dependency.communicate()
+        if not stdout_dependency:
+            raise RuntimeError(__('invalid process to list jshell dependencies 
library'))
+
+        # execute java testing code thru jshell and read output
+        proc_java_arrow_code = subprocess.Popen(['echo', '' + code], 
stdout=subprocess.PIPE)
+        proc_jshell_process = subprocess.Popen(['jshell', '--class-path', 
stdout_dependency, '-'], stdin=proc_java_arrow_code.stdout, 
stdout=subprocess.PIPE, text=True)
+        proc_java_arrow_code.stdout.close()
+        stdout_java_arrow, stderr_java_arrow = 
proc_jshell_process.communicate()
+        if stderr_java_arrow:
+            raise RuntimeError(__('invalid process to run jshell por arrow 
project'))
+
+        # continue with python logic code to do java output validation battle 
tested
+        output = 'print('+stdout_java_arrow+')'
+
+        # go to default directory 
+        os.chdir(cwd)
+
+        # continue with sphinx default logic
+        return compile(output, name, self.type, flags, dont_inherit)
+
+def setup(app: "ArrowSphinx") -> Dict[str, Any]:
+    app.add_directive('testcode', TestcodeDirective)
+    app.add_directive('testoutput', TestoutputDirective)

Review comment:
       Test directive are imported form doctest directive to reuse. Change 
import to consider only library needed.




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