Be sure that what you really want to be doing is implement FileSystem. Unless you really need to access objects in a database, remote server, or some other such storage, you are probably heading in the wrong direction.

If you do need to implement a FileSystem, you should probably start with AbstractFileSystem - it handles a lot of knotty locking semantics correctly and will save you a lot of time, effort and bugs.

Source: NetBeans FAQ

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