Check Out vs Hijack file in RAD

Question

Can someone please explain, in layman's terms, the difference between a file 'Check Out' and a file 'Hijack' in Rapid Application Developer IDE?

Answer 1

Both should reference a file in a ClearCase snapshot view used with ClearCase SCM Adapter that is included in Rational Application Developer and the optionally installable ClearCase Remote Client Extension:

• checkedout: ready to be modified (and no-one else can check-in the same file before that checked out file is checked-in, in case of a reserved checkout)
• hijacked: the file is not checked out, and yet it is made writable (through OS: chmod or Windows file properties)

An hijacked file needs:

• either to be checked out (to keep the local modification) and then checked in,
• or canceled (the local modification are lost, and the file is read-only again)