File javawrapper of Package jpackage-utils

#!/bin/bash
# /usr/local/bin/javawrapper - the wrapper for binfmt_misc/java

if [ $# -lt 1 ]
then
  echo "Use this program to execute a Java class file, usage:"
  echo -e "\t$0 <jar file>.class"
  exit 1;
fi

CLASS=$1
FQCLASS=`/usr/bin/javaclassname $1`
FQCLASSN=`echo $FQCLASS | sed -e 's/^.*\.$[^.]*$$/\1/'`
FQCLASSP=`echo $FQCLASS | sed -e 's-\.-/-g' -e 's-^[^/]*$--' -e 's-/[^/]*$--'`

# for example:
# CLASS=Test.class
# FQCLASS=foo.bar.Test
# FQCLASSN=Test
# FQCLASSP=foo/bar

unset CLASSBASE

declare -i LINKLEVEL=0

while :; do
  if [ "`basename $CLASS .class`" == "$FQCLASSN" ]; then
    # See if this directory works straight off
    cd -L `dirname $CLASS`
    CLASSDIR=$PWD
    cd $OLDPWD
    if echo $CLASSDIR | grep -q "$FQCLASSP$"; then
      CLASSBASE=`echo $CLASSDIR | sed -e "s.$FQCLASSP$.."`
      break;
    fi
    # Try dereferencing the directory name
    cd -P `dirname $CLASS`
    CLASSDIR=$PWD
    cd $OLDPWD
    if echo $CLASSDIR | grep -q "$FQCLASSP$"; then
      CLASSBASE=`echo $CLASSDIR | sed -e "s.$FQCLASSP$.."`
      break;
    fi
    # If no other possible filename exists
    if [ ! -L $CLASS ]; then
      exec 1>&2
      echo $0:
      echo "  $CLASS should be in a" \
           "directory tree called $FQCLASSP"
      exit 1
    fi
  fi
  if [ ! -L $CLASS ]; then break; fi
  # Go down one more level of symbolic links
  let LINKLEVEL+=1
  if [ $LINKLEVEL -gt 5 ]; then
    exec 1>&2
    echo $0:
    echo "  Too many symbolic links encountered"
    exit 1
  fi
  CLASS=`ls --color=no -l $CLASS | sed -e 's/^.* $[^ ]*$$/\1/'`
done

if [ -z "$CLASSBASE" ]; then
  if [ -z "$FQCLASSP" ]; then
    GOODNAME=$FQCLASSN.class
  else
    GOODNAME=$FQCLASSP/$FQCLASSN.class
  fi
  exec 1>&2
  echo $0:
  echo "  $FQCLASS should be in a file called $GOODNAME"
  exit 1
fi

if ! echo $CLASSPATH | grep -q "^$.*:$*$CLASSBASE$:.*$*"; then
  # class is not in CLASSPATH, so prepend dir of class to CLASSPATH
  if [ -z "${CLASSPATH}" ] ; then
    export CLASSPATH=$CLASSBASE
  else
    export CLASSPATH=$CLASSBASE:$CLASSPATH
  fi
fi

shift

if [ ! -x $1 ]
then
  if which kdialog
  then
    kdialog --error "$1 does not have execute permission ... please fix"
  elif which zenity
  then
    zenity --error --text="$1 does not have execute permission ... please fix"
  else
    echo "$1 does not have execute permission ... please fix"
    echo
    read
  fi
  exit 1
fi

echo "executing:"
echo -e "\t/usr/bin/java $FQCLASS \"$@\":"
echo
echo
if ! /usr/bin/java $FQCLASS "$@"
then
  echo "The execution of $1 failed. The reason is probably that $1 does not contain a main method "
  echo "The class was called as follows:"
  echo " /usr/bin/java $FQCLASS \"$@\""
fi

echo Press key to exit ...
read