/* * This is part of Geomajas, a GIS framework, http://www.geomajas.org/. * * Copyright 2008-2015 Geosparc nv, http://www.geosparc.com/, Belgium. * * The program is available in open source according to the GNU Affero * General Public License. All contributions in this program are covered * by the Geomajas Contributors License Agreement. For full licensing * details, see LICENSE.txt in the project root. */ package org.geomajas.gwt.client.util; import java.util.Iterator; import java.util.List; /** * Utility for string operations. * * @author Jan De Moerloose * @since 1.9.0 */ public final class StringUtil { private StringUtil() { // do not allow instantiation. } /** * Joins a list of strings using the specified separator. * * @param parts string parts * @param separator separator * @return concatenated string */ public static String join(List<String> parts, String separator) { Iterator<String> it = parts.iterator(); StringBuilder builder = new StringBuilder(); while (it.hasNext()) { String part = it.next(); builder.append(part); if (it.hasNext()) { builder.append(separator); } } return builder.toString(); } /** * Extract the extension part of a file name (e.g. 'some.txt' -> 'txt') * @param fileName the file name * @return the extension (without '.') */ public static String getExtension(String fileName) { int index = fileName.lastIndexOf("."); if (index >= 0) { return fileName.substring(index + 1); } else { return null; } } }