New API: BackupFileWriter
-------------------------
Key: IO-316
URL: https://issues.apache.org/jira/browse/IO-316
Project: Commons IO
Issue Type: Bug
Components: Streams/Writers
Affects Versions: 2.1
Reporter: Aaron Digulla
Priority: Minor
Add the new file based I/O class {{BackupFileWriter}} with the following
properties:
- Saves the file to a temporary name
- Creates backup of existing file on {{close()}}
- Renames temp file to desired name on {{close()}}
The backup strategy (number of backups, backup file name) should be pluggable.
There should also be a hook to compare the temporary and the existing file and
do the rename only when they are different. The default hook should always
replace the file.
It should also be possible to override the temporary file name (including the
path, so the temp file can be in the same directory or a different one or even
on a different disk).
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