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   Autoconf Macro: ac_check_class
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  <h1>
   ac_check_class
  </h1>
  <h2>
   Synopsis
  </h2>
  <p class="indent" style="white-space:nowrap;">
   <code>AC_CHECK_CLASS</code>
  </p>
  <h2>
   Description
  </h2>
  <div class="indent">
   <p>
    AC_CHECK_CLASS tests the existence of a given Java class, either in a jar
    or in a '.class' file.
   </p>
   <p>
    *Warning*: its success or failure can depend on a proper setting of the
    CLASSPATH env. variable.
   </p>
   <p>
    Note: This is part of the set of autoconf M4 macros for Java programs. It
    is VERY IMPORTANT that you download the whole set, some macros depend on
    other. Unfortunately, the autoconf archive does not support the concept of
    set of macros, so I had to break it for submission. The general
    documentation, as well as the sample configure.in, is included in the
    <a href="ac_prog_java.html">AC_PROG_JAVA</a> macro.
   </p>
  </div>
  <h2>
   Author
  </h2>
  <p class="indent">
   Stephane Bortzmeyer &lt;bortzmeyer@pasteur.fr&gt;
  </p>
  <h2>
   Last Modified
  </h2>
  <p class="indent">
   2000-07-19
  </p>
  <h2>
   M4 Source Code
  </h2>
  <div class="indent">
   <pre class="m4source">
AC_DEFUN([AC_CHECK_CLASS],[
AC_REQUIRE([AC_PROG_JAVA])
ac_var_name=`echo $1 | sed 's/\./_/g'`
dnl Normaly I'd use a AC_CACHE_CHECK here but since the variable name is
dnl dynamic I need an extra level of extraction
AC_MSG_CHECKING([for $1 class])
AC_CACHE_VAL(ac_cv_class_$ac_var_name, [
if test x$ac_cv_prog_uudecode_base64 = xyes; then
dnl /**
dnl  * Test.java: used to test dynamicaly if a class exists.
dnl  */
dnl public class Test
dnl {
dnl
dnl public static void
dnl main( String[] argv )
dnl {
dnl     Class lib;
dnl     if (argv.length &lt; 1)
dnl      {
dnl             System.err.println ("Missing argument");
dnl             System.exit (77);
dnl      }
dnl     try
dnl      {
dnl             lib = Class.forName (argv[0]);
dnl      }
dnl     catch (ClassNotFoundException e)
dnl      {
dnl             System.exit (1);
dnl      }
dnl     lib = null;
dnl     System.exit (0);
dnl }
dnl
dnl }
cat &lt;&lt; \EOF &gt; Test.uue
begin-base64 644 Test.class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====
EOF
                if uudecode$EXEEXT Test.uue; then
                        :
                else
                        echo "configure: __oline__: uudecode had trouble decoding base 64 file 'Test.uue'" &gt;&amp;AC_FD_CC
                        echo "configure: failed file was:" &gt;&amp;AC_FD_CC
                        cat Test.uue &gt;&amp;AC_FD_CC
                        ac_cv_prog_uudecode_base64=no
                fi
        rm -f Test.uue
        if AC_TRY_COMMAND($JAVA $JAVAFLAGS Test $1) &gt;/dev/null 2&gt;&amp;1; then
                eval "ac_cv_class_$ac_var_name=yes"
        else
                eval "ac_cv_class_$ac_var_name=no"
        fi
        rm -f Test.class
else
        AC_TRY_COMPILE_JAVA([$1], , [eval "ac_cv_class_$ac_var_name=yes"],
                [eval "ac_cv_class_$ac_var_name=no"])
fi
eval "ac_var_val=$`eval echo ac_cv_class_$ac_var_name`"
eval "HAVE_$ac_var_name=$`echo ac_cv_class_$ac_var_val`"
HAVE_LAST_CLASS=$ac_var_val
if test x$ac_var_val = xyes; then
        ifelse([$2], , :, [$2])
else
        ifelse([$3], , :, [$3])
fi
])
dnl for some reason the above statment didn't fall though here?
dnl do scripts have variable scoping?
eval "ac_var_val=$`eval echo ac_cv_class_$ac_var_name`"
AC_MSG_RESULT($ac_var_val)
])
</pre>
  </div>
  <h2>
   License
  </h2>
  <div class="indent">
   <span style="white-space:nowrap;">Copyright &copy; 2000 Stephane Bortzmeyer
   &lt;bortzmeyer@pasteur.fr&gt;</span>
   <p>
    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 2 of the License, or (at your option)
    any later version.
   </p>
   <p>
    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.
   </p>
   <p>
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc., 59
    Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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