StringUtils.java

package org.lodder.subtools.sublibrary.xml;


/**
 * Source: http://www.rgagnon.com/javadetails/java-0307.html
 */

import java.util.HashMap;

public class StringUtils {
  private StringUtils() {}

  private static HashMap<String, String> htmlEntities;
  static {
    htmlEntities = new HashMap<String, String>();
    htmlEntities.put("<", "<");
    htmlEntities.put(">", ">");
    htmlEntities.put("&", "&");
    htmlEntities.put(""", "\"");
    htmlEntities.put("à", "à");
    htmlEntities.put("À", "À");
    htmlEntities.put("â", "â");
    htmlEntities.put("ä", "ä");
    htmlEntities.put("Ä", "Ä");
    htmlEntities.put("Â", "Â");
    htmlEntities.put("Ã", "Ã");
    htmlEntities.put("ã", "ã");
    htmlEntities.put("å", "å");
    htmlEntities.put("Å", "Å");
    htmlEntities.put("æ", "æ");
    htmlEntities.put("Æ", "Æ");
    htmlEntities.put("ç", "ç");
    htmlEntities.put("Ç", "Ç");
    htmlEntities.put("é", "é");
    htmlEntities.put("É", "É");
    htmlEntities.put("è", "è");
    htmlEntities.put("È", "È");
    htmlEntities.put("ê", "ê");
    htmlEntities.put("Ê", "Ê");
    htmlEntities.put("ë", "ë");
    htmlEntities.put("Ë", "Ë");
    htmlEntities.put("ï", "ï");
    htmlEntities.put("Ï", "�?");
    htmlEntities.put("ô", "ô");
    htmlEntities.put("Ô", "Ô");
    htmlEntities.put("ö", "ö");
    htmlEntities.put("Ö", "Ö");
    htmlEntities.put("ø", "ø");
    htmlEntities.put("Ø", "Ø");
    htmlEntities.put("ß", "ß");
    htmlEntities.put("ù", "ù");
    htmlEntities.put("Ù", "Ù");
    htmlEntities.put("û", "û");
    htmlEntities.put("Û", "Û");
    htmlEntities.put("ü", "ü");
    htmlEntities.put("Ü", "Ü");
    htmlEntities.put(" ", " ");
    htmlEntities.put("©", "\u00a9");
    htmlEntities.put("®", "\u00ae");
    htmlEntities.put("€", "\u20a0");
    htmlEntities.put("¡", "¡");
  }

  /*
   * Here the original recursive version. It is fine unless you pass a big string then a Stack
   * Overflow is possible :-(
   * 
   * 
   * public static final String unescapeHTML(String source, int start){ int i,j;
   * 
   * i = source.indexOf("&", start); if (i > -1) { j = source.indexOf(";" ,i); if (j > i) { String
   * entityToLookFor = source.substring(i , j + 1); String value =
   * (String)htmlEntities.get(entityToLookFor); if (value != null) { source = new
   * StringBuffer().append(source.substring(0 , i)) .append(value) .append(source.substring(j + 1))
   * .toString(); return unescapeHTML(source, i + 1); // recursive call } } } return source; }
   * 
   * M. McNeely Jr. has sent a version with do...while()loop which is more robust. Thanks to him!
   */

  public static final String unescapeHTML(String source) {
    int i, j;

    boolean continueLoop;
    int skip = 0;
    do {
      continueLoop = false;
      i = source.indexOf("&", skip);
      if (i > -1) {
        j = source.indexOf(";", i);
        if (j > i) {
          String entityToLookFor = source.substring(i, j + 1);
          String value = htmlEntities.get(entityToLookFor);
          if (value != null) {
            source = source.substring(0, i) + value + source.substring(j + 1);
            continueLoop = true;
          } else {
            skip = i + 1;
            continueLoop = true;
          }
        }
      }
    } while (continueLoop);
    return source;
  }

}