#
# SYNOPSIS
#
#   AX_SAGA_CHECK_JAVA([MINIMUM-VERSION])
#
# DESCRIPTION
#
#   Test for JAVA of a particular version (or newer)
#
#   If no path to the installed java is given,
#   the macro searchs under /usr, /usr/local, /opt and
#   $JAVA_HOME
#
#   This macro calls:
#
#     AC_SUBST(HAVE_JAVA)
#     AC_SUBST(JAVA_HOME)
#     AC_SUBST(HAVE_ANTLR) 
#     AC_SUBST(ANTLR_JAR) 
#
# LAST MODIFICATION
#
#   2007-03-04
#
# COPYLEFT
#
#   Copyright (c) 2008 Andre Merzky      <andre@merzky.net>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.


AC_DEFUN([AX_SAGA_CHECK_JAVA],
[
  AC_ARG_VAR([JAVA_HOME],[JAVA home directory])

  HAVE_JAVA=no
  HAVE_ANTLR=no

  tmp_location=""
  AC_ARG_WITH([java],
              AS_HELP_STRING([--with-java=DIR],
              [use java (default is YES) at DIR (optional)]),
              [
              if test "$withval" = "no"; then
                want_java="no"
              elif test "$withval" = "yes"; then
                want_java="yes"
                tmp_location=""
              else
                want_java="yes"
                tmp_location="$withval"
              fi
              ],
              [want_java="yes"])

  # use JAVA_HOME if avaialble, and if not 
  # overwritten by --with-java=<dir>

  if test "x$want_java" = "xyes"; then
    
    # unused
    # java_lib_version_req=ifelse([$1], ,1.5$1)

    for tmp_path in $tmp_location $JAVA_HOME /usr /usr/local /opt; do
      
      AC_MSG_CHECKING(for java in $tmp_path)

      if ! test -e $tmp_path/bin/java; then
      
        AC_MSG_RESULT(no)

      else

        if test -e $tmp_path/share/java/antlr.jar; then

          HAVE_ANTLR=yes
          ANTLR_JAR="$tmp_path/share/java/antlr.jar"
          AC_SUBST(ANTLR_JAR)
        
        fi

        AC_MSG_RESULT(yes)

        HAVE_JAVA=yes
        JAVA_HOME=$tmp_path
        JAVA=$tmp_path/bin/java
        export HAVE_JAVA

        AC_SUBST(JAVA_HOME)
        AC_SUBST(JAVA)
        
        if test "$tmp_location" != "" && \
           test "$tmp_location" != "$tmp_path" ; then
          AC_MSG_WARN([JAVA found:
                       not in $tmp_location
                       but in $tmp_path])
        fi

        break;

      fi # link ok

    done # foreach path


    if test "$HAVE_JAVA" == "no" ; then
      AC_MSG_WARN(JAVA not found)
    fi

  fi # want_java


  AC_SUBST(HAVE_ANTLR)
  AC_SUBST(HAVE_JAVA)
])