Convert a list to a delimited string. : String Convert « Data Type « Java
Convert a list to a delimited string.
/**
* Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, version 2.1, dated February 1999.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the latest version of the GNU Lesser General
* Public License as published by the Free Software Foundation;
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program (LICENSE.txt); if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//package org.jamwiki.utils;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* This class provides a variety of basic utility methods that are not
* dependent on any other classes within the org.jamwiki package structure.
*/
public class Utilities {
private static Pattern VALID_IPV4_PATTERN = null;
private static Pattern VALID_IPV6_PATTERN = null;
private static final String ipv4Pattern = "(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])";
private static final String ipv6Pattern = "([0-9a-f]{1,4}:){7}([0-9a-f]){1,4}";
static {
try {
VALID_IPV4_PATTERN = Pattern.compile(ipv4Pattern, Pattern.CASE_INSENSITIVE);
VALID_IPV6_PATTERN = Pattern.compile(ipv6Pattern, Pattern.CASE_INSENSITIVE);
} catch (PatternSyntaxException e) {
//logger.severe("Unable to compile pattern", e);
}
}
/**
* Convert a list to a delimited string.
*
* @param list The list to convert to a string.
* @param delimiter The string to use as a delimiter.
* @return A string consisting of the delimited list items, or <code>null</code> if the
* list is <code>null</code> or empty.
*/
public static String listToDelimitedString(List<String> list, String delimiter) {
if (delimiter == null) {
throw new IllegalArgumentException("Attempt to call Utilities.delimitedStringToList with no delimiter specified");
}
if (list == null || list.isEmpty()) {
return null;
}
String result = "";
for (String item : list) {
if (result.length() > 0) {
result += delimiter;
}
result += item;
}
return result;
}
}