Mega Code Archive
Split up a string into multiple strings based on a delimiter
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/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
public class Main{
/** An empty string constant */
public static final String EMPTY = "";
/////////////////////////////////////////////////////////////////////////
// Spliting Methods //
/////////////////////////////////////////////////////////////////////////
/**
* Split up a string into multiple strings based on a delimiter.
*
* @param string String to split up.
* @param delim Delimiter.
* @param limit Limit the number of strings to split into
* (-1 for no limit).
* @return Array of strings.
*/
public static String[] split(final String string, final String delim,
final int limit)
{
// get the count of delim in string, if count is > limit
// then use limit for count. The number of delimiters is less by one
// than the number of elements, so add one to count.
int count = count(string, delim) + 1;
if (limit > 0 && count > limit)
{
count = limit;
}
String strings[] = new String[count];
int begin = 0;
for (int i = 0; i < count; i++)
{
// get the next index of delim
int end = string.indexOf(delim, begin);
// if the end index is -1 or if this is the last element
// then use the string's length for the end index
if (end == -1 || i + 1 == count)
end = string.length();
// if end is 0, then the first element is empty
if (end == 0)
strings[i] = EMPTY;
else
strings[i] = string.substring(begin, end);
// update the begining index
begin = end + 1;
}
return strings;
}
/**
* Split up a string into multiple strings based on a delimiter.
*
* @param string String to split up.
* @param delim Delimiter.
* @return Array of strings.
*/
public static String[] split(final String string, final String delim)
{
return split(string, delim, -1);
}
/////////////////////////////////////////////////////////////////////////
// Counting Methods //
/////////////////////////////////////////////////////////////////////////
/**
* Count the number of instances of substring within a string.
*
* @param string String to look for substring in.
* @param substring Sub-string to look for.
* @return Count of substrings in string.
*/
public static int count(final String string, final String substring)
{
int count = 0;
int idx = 0;
while ((idx = string.indexOf(substring, idx)) != -1)
{
idx++;
count++;
}
return count;
}
/**
* Count the number of instances of character within a string.
*
* @param string String to look for substring in.
* @param c Character to look for.
* @return Count of substrings in string.
*/
public static int count(final String string, final char c)
{
return count(string, String.valueOf(c));
}
}
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