There's also a copper bushing. The last time I did this, a month back, the olive really didn't look crushed or deformed at all. I re-used it all shortening the lines.
From memory they give you spares with new brakesets. In any case the olive is designed to be reuseable a few times as long as you remove it without mangling it (I just use a thin jewellers screwdriver to pry it apart).
The barb is also reuseable although can be hard to remove. I tend to just cut the hose along its length and then peel it off the barb.
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