Strings.java

/**
 * Mad-Advertisement
 * Copyright (C) 2011 Thorsten Marx <thmarx@gmx.net>
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.mad.ads.common.util;

import java.util.ArrayList;
import java.util.List;

public class Strings {
	/**
	 * @param str
	 *            string to inspect
	 * @return true if string is null or empty
	 */
	public static boolean isEmpty(String str) {
		return (str == null || str.length() == 0);
	}

	/**
	 * @param str
	 *            string to inspect
	 * @return true if string is null or empty or blank (i.e. whitespace only)
	 */
	public static boolean isBlank(String str) {
		return (str == null || str.trim().length() == 0);
	}

	/**
	 * Removes to file extension
	 * @param s
	 * @return
	 */
	public static String removeExtension(String s) {

		String separator = System.getProperty("file.separator");
		String filename;

		// Remove the path upto the filename.
		int lastSeparatorIndex = s.lastIndexOf(separator);
		if (lastSeparatorIndex == -1) {
			filename = s;
		} else {
			filename = s.substring(lastSeparatorIndex + 1);
		}

		// Remove the extension.
		int extensionIndex = filename.lastIndexOf(".");
		if (extensionIndex == -1)
			return filename;

		return filename.substring(0, extensionIndex);
	}
	
	public static String removeParamFromURL(String url, String param){
	        url = url.replaceAll("\\?" + param + "=[^&]*&?","?");	        
	        url = url.replaceAll("\\&" + param + "=[^&]*&?","&");
	        url = url.replace("/(\\?|&)$/","");
	        
	        return url;
	}
}