Mercurial > octave-libtiff
view scripts/java/usejava.m @ 30564:796f54d4ddbf stable
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2021.
In all .txi and .texi files except gpl.txi and gpl.texi in the
doc/liboctave and doc/interpreter directories, change the copyright
to "Octave Project Developers", the same as used for other source
files. Update copyright notices for 2022 (not done since 2019). For
gpl.txi and gpl.texi, change the copyright notice to be "Free Software
Foundation, Inc." and leave the date at 2007 only because this file
only contains the text of the GPL, not anything created by the Octave
Project Developers.
Add Paul Thomas to contributors.in.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Tue, 28 Dec 2021 18:22:40 -0500 |
parents | 7854d5752dd2 |
children | 5d3faba0342e |
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######################################################################## ## ## Copyright (C) 2012-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {} usejava (@var{feature}) ## Return true if the Java element @var{feature} is available. ## ## Possible features are: ## ## @table @asis ## @item @nospell{@qcode{"awt"}} ## Abstract Window Toolkit for GUIs. ## ## @item @qcode{"desktop"} ## Interactive desktop is running. ## ## @item @qcode{"jvm"} ## Java Virtual Machine. ## ## @item @qcode{"swing"} ## Swing components for lightweight GUIs. ## @end table ## ## @code{usejava} determines if specific Java features are available in an ## Octave session. This function is provided for scripts which may alter ## their behavior based on the availability of Java. The feature ## @qcode{"desktop"} always returns @code{false} as Octave has no Java-based ## desktop. Other features may be available if Octave was compiled with the ## Java Interface and Java is installed. ## @seealso{javachk} ## @end deftypefn function retval = usejava (feature) if (nargin < 1 || ! ischar (feature)) print_usage (); endif retval = false; switch (feature) ## For each feature, try methods() on a Java class of a feature case "awt" try dum = methods ("java.awt.Frame"); retval = ! javaMethod ("isHeadless", "java.awt.GraphicsEnvironment"); end_try_catch case "desktop" ## Octave has no Java based GUI/desktop, leave retval = false case "jvm" try dum = methods ("java.lang.Runtime"); retval = true; end_try_catch case "swing" try dum = methods ("javax.swing.Popup"); retval = ! javaMethod ("isHeadless", "java.awt.GraphicsEnvironment"); end_try_catch otherwise error ("usejava: unrecognized FEATURE '%s'", feature); endswitch endfunction %!assert (usejava ("desktop"), false) %!testif HAVE_JAVA; usejava ("jvm") %! assert (usejava ("jvm"), true); ## Test input validation %!error <Invalid call> usejava () %!error <Invalid call> usejava (1) %!error <unrecognized FEATURE> usejava ("abc")