On Fri, 10 Feb 2017, Murphy, Mark wrote:
I guess I don't understand this that well, so please bear with me. With a File loaded read-write how are changes stored such that writing to a different OutputStream is not feasible? I don't think they are written back to the original File until a write operation is performed. Or is that incorrect?
At the NPOIFS level, if you do writes to an open read-write NPOIFS instance, those will get reflected back to the original file in near-realtime without having to call close/write.
At the HSSF / HWPF / etc level, if you open from a read-write NPOIFS, then write out to a new stream, nothing changes on the original file as a new NPOIFS is generated + populated.
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