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# Functions library for Java applications.                           -*- sh -*-
#
# JPackage Project <http://www.jpackage.org/>
#   Guillaume Rousse <guillomovitch@sourceforge.net>
#   Ville Skyttä <scop at jpackage.org>
#   David Walluck <david@jpackage.org>
#   Nicolas Mailhot <Nicolas.Mailhot at laPoste.net>

# Allow user to override JAVA_HOME
# in his environment
_JAVA_HOME="$JAVA_HOME"

# Read configuration or die.
if [ -f /etc/java/java.conf ] ; then
  . /etc/java/java.conf
else
  echo "Can't find configuration file, aborting"
  exit 1
fi

# Read user configuration file if it exists
[ -f ~/.java/java.conf ] && . ~/.java/java.conf

[ ! -z "$_JAVA_HOME" -a -d "$_JAVA_HOME" ] && JAVA_HOME="$_JAVA_HOME"

# Test default JRE/JVM roots if nothing is defined yet
[ -z "$JAVA_HOME" -a -d "$JVM_ROOT/java" ] && JAVA_HOME="$JVM_ROOT/java"
[ -z "$JAVA_HOME" -a -d "$JVM_ROOT/jre" ] && JAVA_HOME="$JVM_ROOT/jre"

# Set the java virtual machine
set_jvm() {
  # use $JAVA_HOME if defined
  if [ -n "$JAVA_HOME" ] ; then
    return
  fi

  # try to find it from java command

  # try javac first, or we might get the location of the jre instead - djw
  java=`which javac 2>/dev/null || :`

  # if we don't have the jdk, then maybe we have the jre - djw
  if [ -z "$java" ] ; then
    java=`which java 2>/dev/null || :`
  fi

  if [ -n "$java" ] ; then
    while [ -h "$java" ] ; do
      java=`readlink $java 2>/dev/null`
    done
    JAVA_HOME="`dirname $java`/.."
    export JAVA_HOME
    return
  fi

  echo "Can't find java virtual machine, aborting."
  exit 1
}

# Set the classpath
# This requires a valid JAVA_HOME, JAVACMD, and JAVA_LIBDIR
set_classpath() {
  # get local classpath first
  jars=$@
  if [ -n "$ADDITIONAL_JARS" ] ; then
      jars="$jars $ADDITIONAL_JARS"
  fi
  LOCAL_CLASSPATH=$(/usr/bin/build-classpath $jars)
  # append original classpath if defined
  CLASSPATH=$LOCAL_CLASSPATH:$CLASSPATH
}

set_javacmd() {
  if [ -x "$JAVACMD" ]; then
    return
  fi
  set_jvm
  # Add all sorts of jvm layouts here
  if [ -x "$JAVA_HOME/jre/sh/java" ]; then
    JAVACMD="$JAVA_HOME/jre/sh/java"
  elif [ -x "$JAVA_HOME/bin/java" ]; then
    JAVACMD="$JAVA_HOME/bin/java"
  else
    JAVACMD=`which java 2>/dev/null`
  fi

  if [ ! -x "$JAVACMD" ]; then
    echo "$0: error: Failed to set JAVACMD"
    return 1
  fi

  if [ -n "$JAVACMD_OPTS" ]; then
    JAVACMD="$JAVACMD $JAVACMD_OPTS"
  fi

  return 0
}

# Set flags
set_flags() {
  FLAGS=$@
  if [ -n "$ADDITIONAL_FLAGS" ] ; then
    FLAGS="$FLAGS $ADDITIONAL_FLAGS"
  fi
}

# Set options
set_options() {
  OPTIONS=$@
  if [ -n "$ADDITIONAL_OPTIONS" ] ; then
    OPTIONS="$OPTIONS $ADDITIONAL_OPTIONS"
  fi
}

# Run application
run() {
  set_javacmd
  if [ -n "$VERBOSE" ]; then
    echo "java virtual machine used: $JAVACMD"
    echo "classpath used: $CLASSPATH"
    echo "main class used: $MAIN_CLASS"
    echo "flags used: $FLAGS"
    echo "options used: $OPTIONS"
    echo "arguments used: $@"
  fi
  # let's start
  exec $JAVACMD $FLAGS -classpath $CLASSPATH $OPTIONS $MAIN_CLASS "$@"
}

# Set JVM-related directories
# Requires a correct $JAVA_LIBDIR, $JAVA_HOME and $JAVA_CMD
set_jvm_dirs() {
    # Jar repository provided by the JVM
    JVM_LIBDIR=$JVM_ROOT-exports/$(echo "$JAVA_HOME" |\
        sed -n "s+$JVM_ROOT/\([-_[:alnum:].]*\)\(.*\)+\1+p")

    # Java standard version of the JVM.  -fullversion seems to be lot faster
    # to invoke than -version.  Some examples:
    #   java full version "1.4.2_04-b05"
    #   java full version "J2RE 1.4.1 IBM build cxia321411-20030930"
    #   java full version "Blackdown-1.4.1-01"
    #   java version "1.5.0"
    JAVA_VERSION=
    re='\([[:digit:]]\{1,\}\.[[:digit:]]\{1,\}\(\.[[:digit:]]\{1,\}\)*\)'
    for opt in -fullversion -version ; do
        # Yuck, "grep -o" would be cleaner, but requires GNU grep >= 2.5.
        # This could be improved/simplified if sed had non-greedy matching.
        JAVA_VERSION=$($JAVACMD $opt 2>&1 | sed -n \
            -e '/\(openjdk\|java\) \(full \)*version "/s/'$re'/<<<\1>>>/' \
            -e '/\(openjdk\|java\) \(full \)*version "/s/.*<<<\([^>]\{1,\}\)>>>.*/\1/p')
        if [ -n "$JAVA_VERSION" ] ; then
            break
        fi
    done

    # Jar repository for this Java standard
    JAVAVER_LIBDIR=$JAVA_LIBDIR-$JAVA_VERSION
    JAVAVER_JNIDIR=$JNI_LIBDIR-$JAVA_VERSION

    if [ ! -d "$JVM_LIBDIR" ]; then
        echo "$0: error: JVM_LIBDIR $JVM_LIBDIR does not exist or is not a directory"
        return 1
    elif [ ! -d "$JAVAVER_LIBDIR" ]; then
        echo "$0: error: JAVAVER_LIBDIR $JAVAVER_LIBDIR does not exist or is not a directory"
        return 1
    elif [ ! -d "$JAVAVER_JNIDIR" ]; then
        echo "$0: error: JAVAVER_JNIDIR $JAVAVER_JNIDIR does not exist or is not a directory"
        return 1
    fi

    return 0
}


# Links a jar repository
link_jar_repository() {

   unset repository
   unset extension_list

   unset _LINK_CMD
   unset _PRESERVE_NAMING

   while [ $# -gt 0 ] ; do
      case "$1" in
         -h|--hard)
            _LINK_CMD="/bin/ln -fL"
            ;;
         -s|--soft|--symbolic)
            _LINK_CMD="/bin/ln -fs"
            ;;
         -c|--copy)
            _LINK_CMD="/bin/cp -f"
            ;;
         -p|--preserve-naming)
            _PRESERVE_NAMING="true"
            [ -z "$_LINK_CMD" ] && _LINK_CMD="/bin/cp -f"
            ;;
         --|-)
            break
            ;;
         *)
            if [ -z "$repository" ] ; then
               repository=$1
               if ! [ -d "$repository" -a -w "$repository" ] ; then
                  echo "$0: error: $1 must be a writable directory" >&2
                  exit 1
               fi
            else
               extension_list="$extension_list $1"
            fi
            ;;
      esac
      shift
   done

   [ -z "$_LINK_CMD" ] && _LINK_CMD="/bin/ln -fs"
   extension_list="$extension_list $@"

   pushd $repository > /dev/null
      _ALLFOUND=0
      for extension in $extension_list ; do
         extension=$(echo $extension | sed 's+/$++g' | sed 's+\.jar$++g')
         found_extension=$(find_jar $extension)
         found=$?
         [ -z "$_PRESERVE_NAMING" ] \
            && extension=[$(echo $extension | sed 's+/+][+g')] \
            || extension=$(echo $extension | sed 's+/+_+g')
         if [ $found -eq 0 ] ; then
            if [ -d "$found_extension" ] ; then
               for jar in $(find "$found_extension" -follow -name "*.jar") ; do
                  /bin/rm -fr "$extension$(basename $jar)"
                  $_LINK_CMD $jar "$extension$(basename $jar)"
               done
            else
               /bin/rm -fr $extension.jar
               $_LINK_CMD $found_extension $extension.jar
            fi
         else
            # Defer failure to get list of all errors in one shot
            # Do create a symlink so we can recover with another jvm
            /bin/rm -fr $extension.jar
            /bin/ln -fs /could/not/find/extension/for/this/jvm $extension.jar
            _ALLFOUND=1
         fi
      done
   popd $repository > /dev/null
   return $_ALLFOUND
}


# Finds a specific extention (jar or directory)
# Requires a correct $JAVA_LIBDIR, $JAVAVER_LIBDIR and $JVM_LIBDIR
find_jar() {

   # Remove jar extension if present
   extension=$(echo "$1" | sed 's+\.jar$++g')

   found_extension=$(do_find_jar $extension)
   found=$?

   # Version-less fallback
   if [ $found != 0 ] && $(echo $extension | grep -q -e "-[\.[:digit:]]*$")
      then
      # 's+++g' breaks here for some reason (GNU sed 4.1.5), 's///g' works
      extension=$(echo $extension | sed 's/-[\.[:digit:]]\+$//g')
      found_extension=$(do_find_jar $extension)
      found=$?
   fi

   # Root directory fallback
   if [ $found != 0 ] && $(echo $extension | grep -q "/") ; then
      extension=$(dirname $extension)
      found_extension=$(do_find_jar $extension)
      found=$?
   fi

   if [ $found = 0 ] ; then
      echo "$found_extension"
      return 0
   else
      echo "$0: error: Could not find $1 Java extension for this JVM" >&2
      return 1
   fi
}


# Core routine used by find_jar
do_find_jar() {

   extension=$1

   for jardir in "$JVM_LIBDIR" "$JAVAVER_JNIDIR" "$JAVAVER_LIBDIR" \
                 "$JAVAAPP_LIBDIR" "$JNI_LIBDIR" "$JAVA_LIBDIR" ; do
      if [ -d "$jardir" ] ; then
         if [ -r "$jardir/$extension.jar" ] ; then
            echo "$jardir/$extension.jar"
            return 0
         fi
         if [ -d "$jardir/$extension" ] ; then
            echo "$jardir/$extension"
            return 0
         fi
      fi
   done

   return 1
}


## Checks java environment
check_java_env() {

   # This is usually set by set_jvm
   if [ -z "$JAVA_HOME" ] ; then
      echo "$0: error: JAVA_HOME must be set" >&2
      return 1
   fi

   if [ -z "$JAVACMD" ] ; then
      echo "$0: error: JAVACMD must be set" >&2
      return 2
   fi

   if [ -z "$JAVA_LIBDIR" ] ; then
      echo "$0: error: JAVA_LIBDIR must be set" >&2
      return 3
   fi

   if [ -z "$JNI_LIBDIR" ] ; then
      echo "$0: error: JNI_LIBDIR must be set" >&2
      return 4
   fi

   return 0
}
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