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merge stable to default.
author John W. Eaton <jwe@octave.org>
date Fri, 17 Jan 2020 13:27:27 -0600
parents bd51beb6205e 2310164737b3
children bdad8ca48700
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2014-2020 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {} javachk (@var{feature})
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28 ## @deftypefnx {} {} javachk (@var{feature}, @var{caller})
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29 ## @deftypefnx {} {@var{msg} =} javachk (@dots{})
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30 ## Check for the presence of the Java @var{feature} in the current session.
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31 ## Return an error structure if @var{feature} is not available, not enabled,
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32 ## or not recognized.
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33 ##
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34 ## Possible recognized features are:
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35 ##
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36 ## @table @asis
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37 ## @item @nospell{@qcode{"awt"}}
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38 ## Abstract Window Toolkit for GUIs.
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39 ##
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40 ## @item @qcode{"desktop"}
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41 ## Interactive desktop is running.
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42 ##
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43 ## @item @qcode{"jvm"}
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44 ## Java Virtual Machine.
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45 ##
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46 ## @item @qcode{"swing"}
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47 ## Swing components for lightweight GUIs.
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48 ## @end table
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49 ##
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50 ## If @var{feature} is not supported, a scalar struct with field
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51 ## @qcode{"message"} and @qcode{"identifier"} is returned. The field
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52 ## @qcode{"message"} contains an error message mentioning @var{feature} as
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53 ## well as the optional user-specified @var{caller}. This structure is
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54 ## suitable for passing in to the @code{error} function.
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55 ##
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56 ## If @var{feature} is supported and available, an empty struct array is
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57 ## returned with fields @qcode{"message"} and @qcode{"identifier"}.
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58 ##
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59 ## @code{javachk} determines if specific Java features are available in an
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60 ## Octave session. This function is provided for scripts which may alter
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61 ## their behavior based on the availability of Java or specific Java runtime
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62 ## features.
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63 ##
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64 ## Compatibility Note: The feature @qcode{"desktop"} is never available since
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65 ## Octave has no Java-based desktop.
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66 ##
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67 ## @seealso{usejava, error}
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68 ## @end deftypefn
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69
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70 ## Author: Philip Nienhuis <prnienhuis at users.sf.net>
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71 ## Created: 2014-04-19
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72
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73 function msg = javachk (feature, caller = "")
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74
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75 if (nargin < 1 || nargin > 2)
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76 print_usage ();
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77 elseif (! ischar (feature))
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78 error ("javachk: FEATURE must be a string");
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79 elseif (! ischar (caller))
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80 error ("javachk: CALLER must be a string");
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81 endif
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82
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83 if (isempty (caller))
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84 caller = "this function";
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85 endif
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86
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87 msg = struct ("message", "", "identifier", "");
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88
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89 ## Check that Octave was compiled with Java support
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90 chk = logical (__octave_config_info__ ("build_features").JAVA);
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91 if (! chk)
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92 msg.message = sprintf (["javachk: %s is not supported, " ...
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93 "Octave was not compiled with Java support"],
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94 caller);
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95 msg.identifier = "Octave:javachk:java-not-supported";
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96 endif
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97
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98 if (chk)
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99 chk = false;
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100 ## For each feature, try methods() on a Java class of a feature
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101 switch (feature)
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102 case "awt"
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103 try
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104 dum = methods ("java.awt.Frame");
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105 chk = true;
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106 end_try_catch
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107 case "desktop"
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108 ## Octave has no Java based GUI/desktop, leave chk = false
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109 case "jvm"
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110 try
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111 dum = methods ("java.lang.Runtime");
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112 chk = true;
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113 end_try_catch
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114 case "swing"
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115 try
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116 dum = methods ("javax.swing.Popup");
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117 chk = true;
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118 end_try_catch
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119 otherwise
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120 ## Unrecognized feature is the same as disabled feature
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121 endswitch
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122
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123 if (! chk)
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124 msg.message = sprintf (['javachk: %s is not supported, Java feature '...
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125 '"%s" is not available'], caller, feature);
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126 msg.identifier = "Octave:javachk:feature-not-available";
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127 endif
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128
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129 endif
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130
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131 if (isempty (msg.message))
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132 ## Compatibility: Matlab returns a 0x1 empty struct when javachk passes
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133 msg = resize (msg, 0, 1);
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134 endif
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135
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136 endfunction
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137
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138
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139 %!testif ; ! __octave_config_info__().build_features.JAVA
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140 %! msg = javachk ("desktop");
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141 %! assert (msg.message, "javachk: this function is not supported, Octave was not compiled with Java support");
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142 %! assert (msg.identifier, "Octave:javachk:java-not-supported");
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143
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144 %!testif HAVE_JAVA
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145 %! msg = javachk ("desktop");
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146 %! assert (msg.message, 'javachk: this function is not supported, Java feature "desktop" is not available');
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147 %! assert (msg.identifier, "Octave:javachk:feature-not-available");
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148
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149 %!testif HAVE_JAVA
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150 %! msg = javachk ("desktop", "Java DESKTOP");
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151 %! assert (msg.message, 'javachk: Java DESKTOP is not supported, Java feature "desktop" is not available');
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152 %! assert (msg.identifier, "Octave:javachk:feature-not-available");
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153
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154 %!testif HAVE_JAVA
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155 %! msg = javachk ("nosuchfeature");
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156 %! assert (msg.message, 'javachk: this function is not supported, Java feature "nosuchfeature" is not available');
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157 %! assert (msg.identifier, "Octave:javachk:feature-not-available");
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158
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159 %!testif HAVE_JAVA; usejava ("jvm")
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160 %! stnul = resize (struct ("message", "", "identifier", ""), 0, 1);
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161 %! assert (javachk ("jvm"), stnul);
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162
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163 ## Test input validation
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164 %!error javachk ()
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165 %!error javachk (1)
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166 %!error javachk ("jvm", 2)
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167 %!error javachk ("jvm", "feature", "ok")