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Re: [netrexx-pipelines] [netrexx] Calling a method in another, variable, class
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From: Jeff H. <Je...@Je...> - 2023-02-12 20:56:02
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>René,</p>
<p>Yep,</p>
<p>I get it to work with the stage name <b>AHELP</b>, which in CMS
is an almost alias for <b>HELP</b>. <br>
</p>
<p>I tried to make a HELP class that extends AHELP, but it gives the
same error. I then removed all "help.*" files from both <b>src</b>
and <b>build</b> directories then rebuilt. Only to get the same
error. It seems there must be a <b>help</b> class somewhere else
in Java/NetRexx.</p>
<p>A solution (?) might be to have the <b>AHELP</b> as a standard
stage class and in the pipeline scheduler make a stage alias for <b>HELP</b>,
like we do for <b>></b>.</p>
<p>While I'd like to be able to use a DISPLAY stage for all the
fancy HTML stuff, for now I'll go for plain text via SAY. And
continue working in that direction.</p>
<p>Thanks for all your help.</p>
<p>Jeff<br>
</p>
<div class="moz-cite-prefix">On 2/12/2023 10:45 AM, René Jansen
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:629...@xs...">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Hi Jeff,
<div><br>
</div>
<div>I checked in a working help stage.<br>
<div><br>
</div>
<div>My conjecture: somehow we confused the compiler by naming
both the class 'help' and the method 'help'. The latter
returns a type Rexx.</div>
<div>My first reflex was to call your class 'helo' and then it
works when starting a </div>
<div><br>
</div>
<div>pipe "helo crc | cons"</div>
<div><br>
</div>
<div>but because 'helo' is not a good name for a help stage, I
renamed it back, and changed the help() method on class stage
and class crc to 'giveHelp'.</div>
<div><br>
</div>
<div>Somehow someone took a shortcut somewhere. Line 50 must be
from the generated stage source. Do we accept this or do we
open an issue to go to the bottom?</div>
<div><br>
</div>
<div>best regards,</div>
<div><br>
</div>
<div>René.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
<div><br>
<blockquote type="cite">
<div>On 12 Feb 2023, at 14:31, Jeff Hennick
<a class="moz-txt-link-rfc2396E" href="mailto:Je...@Je..."><Je...@Je...></a> wrote:</div>
<br class="Apple-interchange-newline">
<div>
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<div>
<p>René,</p>
<p>Thank you.</p>
<p>At the moment, I am still pursuing the previous
way, but running into a problem.</p>
<p>Your code worked for me. ONCE. Now it doesn't, in
a way I do not understand.</p>
<p>First, there were some exceptions that needed
attention. These I now CATCH.</p>
<p>So here first is my code, then the results.</p>
<blockquote>
<p><font face="monospace">-- help.nrx NJPipe Stage<br>
/*<br>
* Copyright (C) 2023 Jeffrey Hennick, Jeff @
Jeff-H . com<br>
* Distributed under the ICU 1.8.1 License with
NO WARRANTIES of ANY kind.<br>
* See LICENSE for the license and information
on using, copying, modifying,<br>
* and distributing this program.<br>
*/<br>
/*<br>
*/<br>
<br>
options nostrictcase nostrictargs nostrictsignal<br>
package org.netrexx.njpipes.stages<br>
<br>
import org.netrexx.njpipes.pipes.<br>
<br>
class help extends stage binary</font></p>
<p><font face="monospace">trace results</font></p>
<p><font face="monospace">method run()<br>
<br>
parse arg() stage_to_help .<br>
if stage_to_help = '' then<br>
say "Usage: HELP stage_name."<br>
else if stage_to_help = 'HELP' then<br>
say helphelp()<br>
else do<br>
stageClass =
class.forName('org.netrexx.njpipes.stages.'stage_to_help)<br>
helpMethod =
stageClass.getMethod('help',null)<br>
say helpMethod.invoke(stageClass,null)<br>
catch java.lang.ClassNotFoundException<br>
Emsg(11, "Stage" stage_to_help "was not
found.")<br>
catch java.lang.NoSuchMethodException<br>
Emsg(11, "No Help was found for Stage"
stage_to_help".")<br>
catch java.lang.IllegalAccessException<br>
Emsg(11, "Illegal Access.")<br>
catch
java.lang.reflect.InvocationTargetException<br>
Emsg(11, "Reflection Invocation Target
Error.")<br>
end<br>
<br>
loop forever<br>
aobj = peekto()<br>
output(aobj)<br>
readto()<br>
catch StageError<br>
end<br>
<br>
rc = mrc()<br>
exit(rc*(rc<>12))<br>
<br>
method helphelp() static<br>
return -<br>
"/** help\n" -<br>
" \n" -<br>
"
>>--+-HELP--+--------+-----------------------><
\n" -<br>
" | +-string-+ \n" -<br>
" \n" -<br>
"*/\n"<br>
<br>
</font><br>
</p>
</blockquote>
<div style="display:inline-block;white-space:pre;background-color:#012456;font-family:'Cascadia Code',monospace;font-size:10pt;padding:4px;"><span style="color:#D3D7CF;background-color:#012456;">PS C:\Users\Jeff\Documents\nr\netrexx-code\examples\pipes> </span><span style="color:#FCE94F;background-color:#012456;">pipe </span><span style="color:#D3D7CF;background-color:#012456;">"help find"
50 +++ _s_1 = help()
+++ ^^^^
+++ Error: Cannot convert value of type 'netrexx.lang.Rexx' for assignment t
o variable of type 'org.netrexx.njpipes.pipes.stage'
NetRexx portable processor 4.05-beta build 1,005-20230212-0754
Copyright (c) RexxLA, 2011,2023. All rights reserved.
Parts Copyright (c) IBM Corporation, 1995,2008.
Program pebe3cec
=== class pebe3cec ===
constructor pebe3cec(Object)
overrides pipe()
method reset
function get(Object)
method setup(Object)
50 +++ _s_1 = help()
+++ ^^^^
+++ Error: Cannot convert value of type 'netrexx.lang.Rexx' for assignment t
o variable of type 'org.netrexx.njpipes.pipes.stage'
method config
method setup2
method run
signals ThreadQ
overrides stage.run
function main(String[])
signals ThreadQ
Compilation of 'pebe3cec' failed [one error]
Compilation failed.
PS C:\Users\Jeff\Documents\nr\netrexx-code\examples\pipes></span></div>
<p> I don't know where the line "50" is. My 50 is a
blank line, but the error message stays the same
when I added blank lines above it.</p>
<p>It does not matter what stage name I ask for the
help.<br>
</p>
<p>Trying from the "raw" PowerShell prompt or in NRWS;
with and without quote marks, has made no
difference.</p>
<p>Thanks for any insight.</p>
<p>Jeff<br>
</p>
<div class="moz-cite-prefix">On 2/11/2023 8:13 AM,
René Jansen wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1E0...@xs...">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
rerouted answer to pipelines list:
<div><br>
</div>
<div>Jeff,</div>
<div><br>
</div>
<div>we have an INSIDE stage, so I would skip all
quoting and continuing and pick the right lines
out of a file with INSIDE - then you can use the
class-level help() to call super.help(stage) and
have that deliver the lines.</div>
<div>(In there we can test the terminal for graphic
ability and deliver the optimal graphics - more
than one terminal can do SVG nowadays).</div>
<div><br>
</div>
<div>best regards,</div>
<div><br>
</div>
<div>René.<br>
<div><br>
<blockquote type="cite">
<div>On 11 Feb 2023, at 13:34, Jeffrey Hennick
<a class="moz-txt-link-rfc2396E"
href="mailto:Je...@Je..."
moz-do-not-send="true"><Je...@Je...></a>
wrote:</div>
<br class="Apple-interchange-newline">
<div>
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
<div>
<p>Looks great. I'll explore it more
later today. Then get to the stage
files. Most of them have the railroad
diagram in a comment, so it means moving
that to the new help() method. I do
wish NetRexx had a multi-line quote for
this, but adding quote marks and a
continuation character to each line
should do the trick. (The <b>help</b>
stage will need some special work so
this method is not taken as a
constructor.)<br>
</p>
<p>Thanks!</p>
<p>Jeff<br>
</p>
<div class="moz-cite-prefix">On 2/10/2023
4:50 PM, <a
class="moz-txt-link-abbreviated
moz-txt-link-freetext"
href="mailto:rvj...@xs..."
moz-do-not-send="true">rvj...@xs...</a>
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AEA...@xs...">
<meta http-equiv="content-type"
content="text/html; charset=UTF-8">
And you should use getMethod instead of
getDeclaredMethod if you want to inherit
the help() from stage - the superclass,
for stages that don't have helping yet:
<div><br>
</div>
<div>
<div><font face="Courier New">parse
arg stage_to_help</font></div>
<div><font face="Courier New">stageClass
=
class.forName('org.netrexx.njpipes.stages.'stage_to_help)</font></div>
<div><font face="Courier New">helpMethod
=
stageClass.getMethod('help',null)</font></div>
<div><font face="Courier New">say
helpMethod.invoke(stageClass,null)</font></div>
<div><br>
</div>
<div>best regards,</div>
<div><br>
</div>
<div>René.<br>
<blockquote type="cite">
<div>On 10 Feb 2023, at 22:43, <a
class="moz-txt-link-abbreviated moz-txt-link-freetext"
href="mailto:rvj...@xs..."
moz-do-not-send="true">rvj...@xs...</a>
wrote:</div>
<br
class="Apple-interchange-newline">
<div>
<meta charset="UTF-8">
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;">Hi
Jeff,</div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><br>
</div>
<span style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;
float: none; display: inline
!important;">I think this is
the best solution for the
moment: We know that the
stages package is available.
We can load the stage class
with the Java Reflection API,
and then call (invoke) the
help() method on it:</span>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><br>
</div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New">➜ test
git:(master) ✗ cat
loadhelp.nrx</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New">parse arg
stage_to_help</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New">stageClass
=
class.forName('org.netrexx.njpipes.stages.'stage_to_help)</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New">helpMethod
=
stageClass.getDeclaredMethod('help',null)</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New">say
helpMethod.invoke(stageClass,null)</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New"><br>
</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New">➜ test
git:(master) ✗ java loadhelp
crc</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><font
face="Courier New">The CRC
stage computes a CRC-32
checksum over its input.</font></div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><br>
</div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;">So
you pass in the (short) stage
name, complete its name in the
class.forName method, which
leave a Class object in
variable stageClass. We ask
that Class object to return
the help() method in the
variable helpMethod. On that,
we invoke it with no
parameters, it returns the
help message from the static
help() method.</div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><br>
</div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;">best
regards,</div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;"><br>
</div>
<div style="caret-color: rgb(0,
0, 0); font-family: Helvetica;
font-size: 12px; font-style:
normal; font-variant-caps:
normal; font-weight: 400;
letter-spacing: normal;
text-align: start;
text-indent: 0px;
text-transform: none;
white-space: normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px; text-decoration: none;">René.<br>
<div>
<div><br>
<blockquote type="cite">
<div>On 10 Feb 2023, at
16:14, <a
class="moz-txt-link-abbreviated
moz-txt-link-freetext" href="mailto:rvj...@xs..."
moz-do-not-send="true">rvj...@xs...</a>
wrote:</div>
<br
class="Apple-interchange-newline">
<div><span
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size: 12px;
font-style: normal;
font-variant-caps:
normal; font-weight:
400; letter-spacing:
normal; text-align:
start; text-indent:
0px; text-transform:
none; white-space:
normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none; float: none;
display: inline
!important;">and
with that I mean the
example
below-below. </span><br
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size: 12px;
font-style: normal;
font-variant-caps:
normal; font-weight:
400; letter-spacing:
normal; text-align:
start; text-indent:
0px; text-transform:
none; white-space:
normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;">
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size: 12px;
font-style: normal;
font-variant-caps:
normal; font-weight:
400; letter-spacing:
normal; text-align:
start; text-indent:
0px; text-transform:
none; white-space:
normal;
word-spacing: 0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;"><br>
<blockquote
type="cite">
<div>On 10 Feb
2023, at 16:08,
<a
class="moz-txt-link-abbreviated
moz-txt-link-freetext" href="mailto:rvj...@xs..."
moz-do-not-send="true">rvj...@xs...</a>
wrote:</div>
<br
class="Apple-interchange-newline">
<div><span
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none; float:
none; display:
inline
!important;">Hi
Jeff,</span>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;"><br>
</div>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;">I added
a static
help() method
to pipes.stage
. I also did
override that
method on the
new crc stage;
this just to
show.</div>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;"><br>
</div>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;">Now
about
enumeration of
the stages: we
have several
approaches. We
could, at
NetRexx build
time,
enumerate all
the built-in
stages into a
structure.
That might be
the most
efficient and
straigtforward
way. We could
also do that
dynamically;
if the
compiler can
do it, we also
could. This
might be more
involved and
would take
slightly
longer.</div>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;"><br>
</div>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;">The
example below
does not work
because you
need to
instantiate
the stage
before you can
call methods
on it.</div>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-indent:
0px;
text-transform:
none;
white-space:
normal;
word-spacing:
0px;
-webkit-text-stroke-width:
0px;
text-decoration:
none;"><br>
</div>
<div
style="caret-color:
rgb(0, 0, 0);
font-family:
Helvetica;
font-size:
12px;
font-style:
normal;
font-variant-caps:
normal;
font-weight:
400;
letter-spacing:
normal;
text-align:
start;
text-inden...
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