If you wish to prevent certain Command classes from being instantiated,
the framework provides a simple mechanism for doing so. In class
CommandLaunchTask, you can see that a protected method has been
implememented for each and every default Command class available.
All you have to do override these methods in your derived class and do nothing.
Example 11.2. Encapsulation of command instance creation
class CommandLaunchTask extends AbstractLaunchTask
{
{...}
final public int run() throws Exception
{
doNewDocumentCommand();
doOpenCommand();
doCloneDocumentCommand();
doCloseCommand();
doCloseAllCommand();
{...}
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