private void initializeModes(Object modeArgument) { Ruby runtime = getRuntime(); if (modeArgument == null) { data.modes = RubyIO.newModeFlags(runtime, "r+"); } else if (modeArgument instanceof Long) { data.modes = RubyIO.newModeFlags(runtime, ((Long) modeArgument).longValue()); } else { data.modes = RubyIO.newModeFlags(runtime, (String) modeArgument); } setupModes(); }