HtmlUnescape.java

/*
 * Copyright (C) 2010- Peer internet solutions
 * 
 * This file is part of mixare.
 * 
 * This program is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version. 
 * 
 * This program 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 General Public License 
 * for more details. 
 * 
 * You should have received a copy of the GNU General Public License along with 
 * this program. If not, see <http://www.gnu.org/licenses/>
 */
package org.mixare.lib;

import java.util.HashMap;

public class HtmlUnescape {

	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("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", "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");
	}

	public static 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;
	}

}