001 /* 002 * Copyright © 2008, 2009 Pedro Agulló Soliveres. 003 * 004 * This file is part of DirectJNgine. 005 * 006 * DirectJNgine is free software: you can redistribute it and/or modify 007 * it under the terms of the GNU General Public License as published by 008 * the Free Software Foundation, either version 3 of the License. 009 * 010 * Commercial use is permitted to the extent that the code/component(s) 011 * do NOT become part of another Open Source or Commercially developed 012 * licensed development library or toolkit without explicit permission. 013 * 014 * DirectJNgine is distributed in the hope that it will be useful, 015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 017 * GNU General Public License for more details. 018 * 019 * You should have received a copy of the GNU General Public License 020 * along with DirectJNgine. If not, see <http://www.gnu.org/licenses/>. 021 * 022 * This software uses the ExtJs library (http://extjs.com), which is 023 * distributed under the GPL v3 license (see http://extjs.com/license). 024 */ 025 026 package com.softwarementors.extjs.djn; 027 028 import java.util.ArrayList; 029 import java.util.List; 030 031 public final class StringUtils { 032 private StringUtils() { 033 // Disallow instantiation 034 } 035 036 public static boolean isEmpty( String value ) { 037 return value == null || value.equals( ""); 038 } 039 040 public static String concatWithSeparator(List<String> missingParameters, String separator) { 041 assert missingParameters != null; 042 assert separator != null; 043 044 if( missingParameters.isEmpty() ) { 045 return ""; 046 } 047 048 StringBuilder result = new StringBuilder(); 049 for( int i = 0; i < missingParameters.size() - 1; i++) { 050 result.append( missingParameters.get(i)); 051 result.append( separator ); 052 } 053 054 result.append( missingParameters.get( missingParameters.size() - 1)); 055 056 return result.toString(); 057 } 058 059 // Returns a list of strings form a 'delimiter' separated string. 060 // It removes whitespace from every value, and ignores empty strings 061 public static List<String> getNonBlankValues( String delimitedValues, String delimiter ) { 062 assert !StringUtils.isEmpty( delimitedValues ); 063 assert !StringUtils.isEmpty(delimiter); 064 065 List<String> result = new ArrayList<String>(); 066 String[] values = delimitedValues.split( delimiter); 067 for( String value : values ) { 068 value = value.trim(); 069 if( !value.equals( "")) { 070 result.add( value ); 071 } 072 } 073 074 return result; 075 } 076 077 }