Macro: ac_check_class

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# ac_check_class

## Synopsis

`AC_CHECK_CLASS`

## Version

1.1.1.1 (2001/07/26) Java_Support @ ac-archive-0.5.32

## Author

Stephane Bortzmeyer <bortzmeyer@pasteur.fr>

## Description

AC_CHECK_CLASS tests the existence of a given Java class, either in a jar or in a '.class' file.

*Warning*: its success or failure can depend on a proper setting of the CLASSPATH env. variable.

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 AC_PROG_JAVA macro.

## M4 Source Code

    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$ac_cv_prog_uudecode_base64 = xyes; then
    dnl /**
    dnl  * Test.java: used to test dynamicaly if a class exists.
    dnl  */
    dnl public class Test
    dnl {
    dnl
    dnl public static void
    dnl main( String[] argv )
    dnl {
    dnl     Class lib;
    dnl     if (argv.length < 1)
    dnl      {
    dnl             System.err.println ("Missing argument");
    dnl             System.exit (77);
    dnl      }
    dnl     try
    dnl      {
    dnl             lib = Class.forName (argv[0]);
    dnl      }
    dnl     catch (ClassNotFoundException e)
    dnl      {
    dnl             System.exit (1);
    dnl      }
    dnl     lib = null;
    dnl     System.exit (0);
    dnl }
    dnl
    dnl }
    cat << \EOF > Test.uue
    begin-base64 644 Test.class
    yv66vgADAC0AKQcAAgEABFRlc3QHAAQBABBqYXZhL2xhbmcvT2JqZWN0AQAE
    bWFpbgEAFihbTGphdmEvbGFuZy9TdHJpbmc7KVYBAARDb2RlAQAPTGluZU51
    bWJlclRhYmxlDAAKAAsBAANlcnIBABVMamF2YS9pby9QcmludFN0cmVhbTsJ
    AA0ACQcADgEAEGphdmEvbGFuZy9TeXN0ZW0IABABABBNaXNzaW5nIGFyZ3Vt
    ZW50DAASABMBAAdwcmludGxuAQAVKExqYXZhL2xhbmcvU3RyaW5nOylWCgAV
    ABEHABYBABNqYXZhL2lvL1ByaW50U3RyZWFtDAAYABkBAARleGl0AQAEKEkp
    VgoADQAXDAAcAB0BAAdmb3JOYW1lAQAlKExqYXZhL2xhbmcvU3RyaW5nOylM
    amF2YS9sYW5nL0NsYXNzOwoAHwAbBwAgAQAPamF2YS9sYW5nL0NsYXNzBwAi
    AQAgamF2YS9sYW5nL0NsYXNzTm90Rm91bmRFeGNlcHRpb24BAAY8aW5pdD4B
    AAMoKVYMACMAJAoAAwAlAQAKU291cmNlRmlsZQEACVRlc3QuamF2YQAhAAEA
    AwAAAAAAAgAJAAUABgABAAcAAABtAAMAAwAAACkqvgSiABCyAAwSD7YAFBBN
    uAAaKgMyuAAeTKcACE0EuAAaAUwDuAAasQABABMAGgAdACEAAQAIAAAAKgAK
    AAAACgAAAAsABgANAA4ADgATABAAEwASAB4AFgAiABgAJAAZACgAGgABACMA
    JAABAAcAAAAhAAEAAQAAAAUqtwAmsQAAAAEACAAAAAoAAgAAAAQABAAEAAEA
    JwAAAAIAKA==
    ====
    EOF
                    if uudecode$EXEEXT Test.uue; then
                            :
                    else
                            echo "configure: __oline__: uudecode had trouble decoding base 64 file 'Test.uue'" >&AC_FD_CC
                            echo "configure: failed file was:" >&AC_FD_CC
                            cat Test.uue >&AC_FD_CC
                            ac_cv_prog_uudecode_base64=no
                    fi
            rm -f Test.uue
            if AC_TRY_COMMAND($JAVA $JAVAFLAGS Test $1) >/dev/null 2>&1; then
                    eval "ac_cv_class_$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)
    ])