this_java='java-8-openjdk/jre'

post_install() {
  default=$(/usr/bin/parabola-java get)
  if [ -z "${default}" ]; then
    /usr/bin/parabola-java set ${this_java}
  elif [ "${default/\/jre}" = "${this_java/\/jre}" ]; then
    /usr/bin/parabola-java fix
  else
    echo "Default Java environment is already set to '${default}'"
    echo "To set '${this_java}' as default, consider using:"
    echo "  parabola-java set '${this_java}'"
  fi

  if [ ! -f /etc/ssl/certs/java/cacerts ]; then
    # Overwrite JAVA_HOME because if it still points at java-8-openjdk AND user just removed jdk,
    # Then /usr/bin/java will in the end, refer to /usr/lib/jvm/java-7-openjdk/java which doesn't exist
    JAVA_HOME=/usr/lib/jvm/${this_java} /usr/bin/init-jks-keystore
  fi
}

post_upgrade() {
  default=$(/usr/bin/parabola-java get)
  if [ -z "${default}" ]; then
    /usr/bin/parabola-java set ${this_java}
  elif [ "${default/\/jre}" = "${this_java/\/jre}" ]; then
    /usr/bin/parabola-java fix
  fi

  if [ ! -f /etc/ssl/certs/java/cacerts ]; then
    JAVA_HOME=/usr/lib/jvm/${this_java} /usr/bin/init-jks-keystore
  fi
}

pre_remove() {
  default=$(/usr/bin/parabola-java get)
  if [ "x${default/\/jre}" = "x${this_java/\/jre}" ]; then
    /usr/bin/parabola-java unset
    echo 'No Java environment is set anymore'
  fi
}