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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.util;
import java.util.*;
/**
* This class provides some utility methods for working with
* <code>java.util.List</code> objects.
*
* @author Eric Lafortune
*/
public class ListUtil
{
/**
* Creates a comma-separated String from the given List of String objects.
*/
public static String commaSeparatedString(List list)
{
if (list == null)
{
return null;
}
StringBuffer buffer = new StringBuffer();
for (int index = 0; index < list.size(); index++)
{
if (index > 0)
{
buffer.append(',');
}
buffer.append(quotedString((String)list.get(index)));
}
return buffer.toString();
}
/**
* Creates a List of String objects from the given comma-separated String.
*/
public static List commaSeparatedList(String string)
{
if (string == null)
{
return null;
}
List list = new ArrayList();
int index = 0;
while ((index = skipWhitespace(string, index)) < string.length())
{
int nextIndex;
// Do we have an opening quote?
if (string.charAt(index) == '\'')
{
// Parse a quoted string.
nextIndex = string.indexOf('\'', index + 1);
if (nextIndex < 0)
{
nextIndex = string.length();
}
list.add(string.substring(index + 1, nextIndex));
}
else
{
// Parse a non-quoted string.
nextIndex = string.indexOf(',', index);
if (nextIndex < 0)
{
nextIndex = string.length();
}
String substring = string.substring(index, nextIndex).trim();
if (substring.length() > 0)
{
list.add(substring);
}
}
index = nextIndex + 1;
}
return list;
}
/**
* Skips any whitespace characters.
*/
private static int skipWhitespace(String string, int index)
{
while (index < string.length() &&
Character.isWhitespace(string.charAt(index)))
{
index++;
}
return index;
}
/**
* Returns a quoted version of the given string, if necessary.
*/
private static String quotedString(String string)
{
return string.length() == 0 ||
string.indexOf(' ') >= 0 ||
string.indexOf('@') >= 0 ||
string.indexOf('{') >= 0 ||
string.indexOf('}') >= 0 ||
string.indexOf('(') >= 0 ||
string.indexOf(')') >= 0 ||
string.indexOf(':') >= 0 ||
string.indexOf(';') >= 0 ||
string.indexOf(',') >= 0 ? ("'" + string + "'") :
( string );
}
public static void main(String[] args)
{
if (args.length == 1)
{
System.out.println("Input string: ["+args[0]+"]");
List list = commaSeparatedList(args[0]);
System.out.println("Resulting list:");
for (int index = 0; index < list.size(); index++)
{
System.out.println("["+list.get(index)+"]");
}
}
else
{
List list = Arrays.asList(args);
System.out.println("Input list:");
for (int index = 0; index < list.size(); index++)
{
System.out.println("["+list.get(index)+"]");
}
String string = commaSeparatedString(list);
System.out.println("Resulting string: ["+string+"]");
}
}
}
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