Mega Code Archive
Splits the provided text into a list, based on a given separator
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import java.util.StringTokenizer;
/*
* The Apache Software License, Version 1.1
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/**
* max: Removed methods that dependent on anything else than common.StringUtils.
*
* <p>Common <code>String</code> manipulation routines.</p>
*
* <p>Originally from
* <a href="http://jakarta.apache.org/turbine/">Turbine</a> and the
* GenerationJavaCore library.</p>
*
* @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
* @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
* @author <a href="mailto:gcoladonato@yahoo.com">Greg Coladonato</a>
* @author <a href="mailto:bayard@generationjava.com">Henri Yandell</a>
* @author <a href="mailto:ed@apache.org">Ed Korthof</a>
* @author <a href="mailto:rand_mcneely@yahoo.com>Rand McNeely</a>
* @author <a href="mailto:scolebourne@joda.org>Stephen Colebourne</a>
* @author <a href="mailto:fredrik@westermarck.com>Fredrik Westermarck</a>
* @version $Id$
*/
public class StringUtil {
/**
* Splits the provided text into a list, based on a given separator.
* The separator is not included in the returned String array.
* The maximum number of splits to perfom can be controlled.
* A null separator will cause parsing to be on whitespace.
*
* <p>This is useful for quickly splitting a string directly into
* an array of tokens, instead of an enumeration of tokens (as
* <code>StringTokenizer</code> does).
*
* @param str The string to parse.
* @param separator Characters used as the delimiters. If
* <code>null</code>, splits on whitespace.
* @param max The maximum number of elements to include in the
* list. A zero or negative value implies no limit.
* @return an array of parsed Strings
*/
public static String[] split(String str, String separator, int max) {
StringTokenizer tok = null;
if (separator == null) {
// Null separator means we're using StringTokenizer's default
// delimiter, which comprises all whitespace characters.
tok = new StringTokenizer(str);
}
else {
tok = new StringTokenizer(str, separator);
}
int listSize = tok.countTokens();
if (max > 0 && listSize > max) {
listSize = max;
}
String[] list = new String[listSize];
int i = 0;
int lastTokenBegin = 0;
int lastTokenEnd = 0;
while (tok.hasMoreTokens() ) {
if (max > 0 && i == listSize - 1) {
// In the situation where we hit the max yet have
// tokens left over in our input, the last list
// element gets all remaining text.
String endToken = tok.nextToken();
lastTokenBegin = str.indexOf(endToken, lastTokenEnd);
list[i] = str.substring(lastTokenBegin);
break;
}
else {
list[i] = tok.nextToken();
lastTokenBegin = str.indexOf(list[i], lastTokenEnd);
lastTokenEnd = lastTokenBegin + list[i].length();
}
i++;
}
return list;
}
}
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