#! /bin/sh

##########################################################################
# checkJ: simple script to checks Java & Jini/JavaSpaces installations
#
# Provides a few parameters, with only simple support (ie, getopt is
# not used, and no -help exists):
#
#  -v    = be verbose when reporting results (if given, it MUST be param #1)
#  -h    = check for JNI (Java Native Interface) header files
#  -jini = check for Jini/JavaSpaces installation
#
#  Note that -h and -jini are mutually exclusive.
#
#  When no command line switches are given the script simply checks for Java.
#
#  Return codes:
#    0 = everything fine (blah is in $PATH and is a new enough version)
#    1 = blah found in $PATH, but is not (or may not be) new enough version
#    2 = blah was not found in $PATH (FATAL)
#
##########################################################################

if [ "$1" = "-v" ] ; then
   Verbose=1
   shift
else
   Verbose=0
fi

# Always check that Java is installed and available
javaPath=`type java 2>&1 | awk '{print $NF}' | grep "/bin/java"`
if [ "$javaPath" = "" ] ; then
   echo "ERROR: You do not have Java/JDK in your \$PATH.  Aborting."
   exit 2
fi

javaVers=`sh -c "java -version 2>&1" | head -1 | grep "\"1\.[2-9]"`
if [ "$javaVers" = "" ] ; then
   echo "WARNING: Your Java/Jdk version needs to be >= 1.2.x" 1>&2
   retval=1
else
   retval=0
fi

if [ "$1" = "-h" ] ; then
  javaBin=`dirname \`type java 2>/dev/null | awk '{print $NF}' \` `
  javaTop=`dirname $javaBin`
  jniPlatDep=`cd ${javaTop}/include ; /usr/bin/find . -name jni_md.h`
  JNIHeaders="-I${javaTop}/include -I${javaTop}/include/`dirname ${jniPlatDep}`"
  if [ "$JNIHeaders" != "" ] ; then
	echo "$JNIHeaders"
  fi
  exit $retval
fi

# syntax: checkJ -ji [<fileToCheck> [<dir1ToCheck>]  [<dir2ToCheck>] ... ]
if [ "$1" = "-jini" ] ; then

   shift
   if [ $# -gt 0 ] ; then
      fileToCheck=$1
      shift
   else
      fileToCheck=lib/jini-core.jar
   fi

   if [ $# -gt 0 ] ; then
         dirs="$@"
      else
         dirs="$HOME /usr/local /usr"
   fi
   jiniDir=""
   retval=2
   for dir in $dirs ; do
	for jdir in $dir/jini* ; do
   	    if [ -f $jdir/$fileToCheck ] && [ "$jiniDir" = "" ] ; then
		jiniDir=$jdir
		retval=0
	    fi
	done
   done
   if [ "$jiniDir" = "" ] ; then
      echo "ERROR: I could not find a Jini installation.  Aborting."
   else
      if [ $Verbose -eq 1 ] ; then 
	 echo "Jini Installation:       $jiniDir"
      else
	 echo "$jiniDir"
      fi
   fi
   exit $retval
fi

if [ $Verbose -eq 1 ] ; then 
   echo "Java Installation:       $javaPath"
else
   echo "$javaPath"
fi
exit $retval