@Override
	public File getChangeDataFile(int version) {
		if (enableChangeFiles) {
			return new File(dir, name + version + ".cf" );
		}
		return null;
	}
<code>DummyBufferFileMgr</code> produces buffer file names and 
tracks the current buffer file version.  No maintenance of buffer
files is provided.
Ghidra/Framework/DB/src/test/java/db/buffers/DummyBufferFileMgr.java