@Override
	public LocalFolderItem refresh() throws IOException {
		if ((useDataDir && !getDataDir().exists()) || !propertyFile.exists()) {
			return null;
		}
		propertyFile.readState();
		return this;
	}
Constructor for a new or existing item which corresponds to the specified 
property file.  
@param fileSystem file system
@param propertyFile property file
@param useDataDir if true the getDataDir() method must return an appropriate 
directory for data storage.
@param create if true the data directory will be created
@throws IOException
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/LocalFolderItem.java