How to enable a menu in Eclipse depending on the EXE file

I want to disable a context menu item in Eclipse plugin bases on the EXE file. I mean, I want to enable the menu only when my EXE file is installed in the user's system. Otherwise it should 开发者_开发问答be in disable mode. What is the way to do it?

There are no easy way to do this.

The normal options are

• have a special option in the test system (which can be spoofed...)
• have a PropertyTester that can test some special different between the systems

The first option is very easy, but can also easily be spoofed.

To do the later, you must

• create and declare a PropertyTester
• add a activeWhen or visibleWhen expression to the relevant menu entries, which use test expression element to get the value from the property tester