Mega Code Archive
Left trim and right trim
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/**
* <pre>
* Utilitaire de gestion des chaines de caractères.
* </pre>
* @version $Date: 2005/07/20 10:59:20 $, $Revision: 1.2 $, branche-$Name: $
* @author $Author: mlo $
*/
public class StringUtils {
/**
* enlever des caractères de la partie gauche
* @param str chaine source
* @param patern chaine à enlever
* @param ignoreCase ignorer MIN/MAJ du patern
* @return chaine résultat
*/
public static String ltrim(String toTrim, String patern, boolean ignoreCase) {
if (!ignoreCase) {
return fastLtrim(toTrim, patern);
}
patern = (patern == null) ? "" : patern;
String str = (toTrim == null) ? "" : toTrim;
int start = 0;
if (!ignoreCase) {
if (str.equalsIgnoreCase (patern)) {
return "";
}
while (true) {
if ((str.length () - start) < patern.length ()) {
break;
}
if (str.substring(start, start + patern.length()).equalsIgnoreCase(patern)) {
start += patern.length();
} else {
break;
}
}
}
return str.substring(start);
}
/**
* enlever des caractères de la partie droite
* @param toTrim chaine source
* @param patern chaine à enlever
* @param ignoreCase ignorer MIN/MAJ du patern
* @return chaine résultat
*/
public static String rtrim(String toTrim, String patern, boolean ignoreCase) {
if (!ignoreCase) {
return fastRtrim(toTrim, patern);
}
patern = (patern == null) ? "" : patern;
String str = (toTrim == null) ? "" : toTrim;
int end = str.length();
if (!patern.equals("") && !str.equals("")) {
while (true) {
if ((end - patern.length()) < 0) {
break;
}
if (str.substring(end - patern.length(), end).equalsIgnoreCase(patern)) {
end -= patern.length();
} else {
break;
}
}
}
return str.substring(0, end);
}
private static String fastLtrim (String toTrim, String pattern) {
if (toTrim == null || pattern == null || pattern.equals ("") || !toTrim.startsWith (pattern)) {
return toTrim;
}
return fastLtrim (toTrim.substring (pattern.length ()), pattern);
}
private static String fastRtrim (String toTrim, String pattern) {
if (toTrim == null || pattern == null || pattern.equals ("") || !toTrim.endsWith (pattern)) {
return toTrim;
}
return fastRtrim (toTrim.substring (0, toTrim.length() - pattern.length ()), pattern);
}
}
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