Left trim and right trim

        


/**
 * <pre>
 * Utilitaire de gestion des chaines de caractres.
 * </pre>
 * @version $Date: 2005/07/20 10:59:20 $, $Revision: 1.2 $, branche-$Name:  $  
 * @author $Author: mlo $
 */
public class StringUtils {
  /**
   * enlever des caractres de la partie gauche
   * @param str chaine source
   * @param patern chaine  enlever
   * @param ignoreCase ignorer MIN/MAJ du patern
   * @return chaine rsultat
   */
  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 caractres de la partie droite
   * @param toTrim chaine source
   * @param patern chaine  enlever
   * @param ignoreCase ignorer MIN/MAJ du patern
   * @return chaine rsultat
   */
  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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Left trim and right trim : String format « Data Type « Java

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