public static String trimWhitespace(String str) {
		if (!hasLength(str)) {
			return str;
		}
		StringBuilder sb = new StringBuilder(str);
		while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
			sb.deleteCharAt(0);
		}
		while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
			sb.deleteCharAt(sb.length() - 1);
		}
		return sb.toString();
	}