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## Copyright (C) 2013-2025 Philip Nienhuis
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## __chk_java_sprt__ Internal io package function
## Author: Philip Nienhuis <prnienhuis@users.sf.net>
## Created: 2013-03-01
function [ tmp1, jcp ] = __chk_java_sprt__ (dbug=0)
jcp = {};
tmp1 = 0;
if (! isempty (javachk ("jvm")))
## No Java support built in => any further checks are moot
return
endif
try
jcp = javaclasspath ("-all");
## If we get here, at least Java works.
if (dbug > 1)
printf (" Java seems to work OK.\n");
endif
## Now check for proper version (>= 1.6)
jver = ...
char (javaMethod ("getProperty", "java.lang.System", "java.version"));
cjver = strsplit (jver, ".");
## Before Java 9 the numbering scheme is "1.ver.x_y".
## For Java 9 it is "ver.x.y".
## For Java 10 and 11 it is just "ver".
java_ver = [];
if (numel (cjver) > 1 && (sscanf (cjver{1}, "%d") == 1))
java_ver = sscanf (cjver{2}, "%d");
elseif (! isempty (cjver))
java_ver = sscanf (cjver{1}, "%d");
endif
if (isempty (java_ver) || java_ver < 6)
warning (["Java version too old (%s). ", ...
"You need at least Java 6 (v. 1.6.x.x).\n"], jver);
if (dbug)
printf (' At Octave prompt, try "system ("java -version")".');
endif
return
else
if (dbug > 2)
printf (" Java (version %s) seems OK.\n", jver);
endif
endif
## Now check for proper entries in class path. Under *nix the classpath
## must first be split up.
if (isunix && ! iscell (jcp));
jcp = strsplit (char (jcp), pathsep ());
endif
tmp1 = 1;
catch
## No Java support
if (dbug)
printf ("No Java support found.\n");
endif
end_try_catch
endfunction
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