StringUtil.java

/**
 * Copyright (C) 2007 Google Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

package org.makersoft.shards.utils;

/**
 * String utilities.
 * 
 * @author maxr@google.com (Max Ross)
 */
public class StringUtil {

	/**
	 * Helper function for null, empty, and whitespace string testing.
	 * 
	 * @return true if s == null or s.equals("") or s contains only whitespace
	 *         characters.
	 */
	public static boolean isEmptyOrWhitespace(String s) {
		s = makeSafe(s);
		for (int i = 0, n = s.length(); i < n; i++) {
			if (!Character.isWhitespace(s.charAt(i))) {
				return false;
			}
		}
		return true;
	}

	/**
	 * @return true if s == null or s.equals("")
	 */
	public static boolean isEmpty(String s) {
		return makeSafe(s).length() == 0;
	}

	/**
	 * Helper function for making null strings safe for comparisons, etc.
	 * 
	 * @return (s == null) ? "" : s;
	 */
	public static String makeSafe(String s) {
		return (s == null) ? "" : s;
	}

	/**
	 * @return the string provided with its first character capitalized
	 */
	public static String capitalize(String s) {
		if (s.length() == 0) {
			return s;
		}
		char first = s.charAt(0);
		char capitalized = Character.toUpperCase(first);
		return (first == capitalized) ? s : capitalized + s.substring(1);
	}
}