1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 package proguard.util; 22 23 import java.util.*; 24 25 26 /** 27 * This class provides some utility methods for working with 28 * <code>java.util.List</code> objects. 29 * 30 * @author Eric Lafortune 31 */ 32 public class ListUtil 33 { 34 /** 35 * Creates a comma-separated String from the given List of String objects. 36 */ commaSeparatedString(List list)37 public static String commaSeparatedString(List list) 38 { 39 if (list == null) 40 { 41 return null; 42 } 43 44 StringBuffer buffer = new StringBuffer(); 45 46 for (int index = 0; index < list.size(); index++) 47 { 48 if (index > 0) 49 { 50 buffer.append(','); 51 } 52 53 buffer.append(quotedString((String)list.get(index))); 54 } 55 56 return buffer.toString(); 57 } 58 59 60 /** 61 * Creates a List of String objects from the given comma-separated String. 62 */ commaSeparatedList(String string)63 public static List commaSeparatedList(String string) 64 { 65 if (string == null) 66 { 67 return null; 68 } 69 70 List list = new ArrayList(); 71 int index = 0; 72 while ((index = skipWhitespace(string, index)) < string.length()) 73 { 74 int nextIndex; 75 76 // Do we have an opening quote? 77 if (string.charAt(index) == '\'') 78 { 79 // Parse a quoted string. 80 nextIndex = string.indexOf('\'', index + 1); 81 if (nextIndex < 0) 82 { 83 nextIndex = string.length(); 84 } 85 86 list.add(string.substring(index + 1, nextIndex)); 87 } 88 else 89 { 90 // Parse a non-quoted string. 91 nextIndex = string.indexOf(',', index); 92 if (nextIndex < 0) 93 { 94 nextIndex = string.length(); 95 } 96 97 String substring = string.substring(index, nextIndex).trim(); 98 if (substring.length() > 0) 99 { 100 list.add(substring); 101 } 102 } 103 104 index = nextIndex + 1; 105 } 106 107 return list; 108 } 109 110 111 /** 112 * Skips any whitespace characters. 113 */ skipWhitespace(String string, int index)114 private static int skipWhitespace(String string, int index) 115 { 116 while (index < string.length() && 117 Character.isWhitespace(string.charAt(index))) 118 { 119 index++; 120 } 121 return index; 122 } 123 124 125 /** 126 * Returns a quoted version of the given string, if necessary. 127 */ quotedString(String string)128 private static String quotedString(String string) 129 { 130 return string.length() == 0 || 131 string.indexOf(' ') >= 0 || 132 string.indexOf('@') >= 0 || 133 string.indexOf('{') >= 0 || 134 string.indexOf('}') >= 0 || 135 string.indexOf('(') >= 0 || 136 string.indexOf(')') >= 0 || 137 string.indexOf(':') >= 0 || 138 string.indexOf(';') >= 0 || 139 string.indexOf(',') >= 0 ? ("'" + string + "'") : 140 ( string ); 141 } 142 143 main(String[] args)144 public static void main(String[] args) 145 { 146 if (args.length == 1) 147 { 148 System.out.println("Input string: ["+args[0]+"]"); 149 150 List list = commaSeparatedList(args[0]); 151 152 System.out.println("Resulting list:"); 153 for (int index = 0; index < list.size(); index++) 154 { 155 System.out.println("["+list.get(index)+"]"); 156 } 157 } 158 else 159 { 160 List list = Arrays.asList(args); 161 162 System.out.println("Input list:"); 163 for (int index = 0; index < list.size(); index++) 164 { 165 System.out.println("["+list.get(index)+"]"); 166 } 167 168 String string = commaSeparatedString(list); 169 170 System.out.println("Resulting string: ["+string+"]"); 171 } 172 } 173 } 174