private File getCommonSymbolsFile() {
		String symbolsFilePath = symbolsFileTextField.getText().trim();
		if (symbolsFilePath.isEmpty()) {
			return null;
		}
		return new File(symbolsFilePath);
	}
Dialog for gathering information to populate a fid database.
Ghidra/Features/FunctionID/src/main/java/ghidra/feature/fid/plugin/PopulateFidDialog.java