If you define a directory validatory derived from this class on the "Advanced tasks" tab
in the install4j GUI it will
be instantiated and used to modify the behavior of the the "Installation location" screen
of the installer.
This method will be called if prepareInstaller returns true to determine if a
different installation directory should be suggested in the installation
location screen.
If you define an installation handler derived from this class on the "Advanced tasks" tab
in the install4j GUI it will be instantiated and queried before the installation of each
file.
The installer environment context that can be used to retrieve information
about the installation process and to perform screen change and file installation operations.
Indicates that if the destination file exists and has not been installed by a previous run of the installer
the user will be asked whether to replace the file.
If you define a startup handler derived from this class on the "Advanced tasks" tab
in the install4j GUI it will
be instantiated and queried before the installer and the uninstaller is started.