private String javadocVisibilityArgument(int visibility, int modifiers) {
	String argument = null;
	switch (modifiers & ExtraCompilerModifiers.AccVisibilityMASK) {
		case ClassFileConstants.AccPublic :
			argument = CompilerOptions.PUBLIC;
			break;
		case ClassFileConstants.AccProtected:
			if (visibility != ClassFileConstants.AccPublic) {
				argument = CompilerOptions.PROTECTED;
			}
			break;
		case ClassFileConstants.AccDefault:
			if (visibility == ClassFileConstants.AccDefault || visibility == ClassFileConstants.AccPrivate) {
				argument = CompilerOptions.DEFAULT;
			}
			break;
		case ClassFileConstants.AccPrivate:
			if (visibility == ClassFileConstants.AccPrivate) {
				argument = CompilerOptions.PRIVATE;
			}
			break;
	}
	return argument;
}