package org.romaframework.frontend.util;
import java.util.Hashtable;
/**
* Converts String in HTML mark-up replacing characters,
*
* @author Giordano Maestro (giordano.maestro--at--assetdata.it) 12/nov/07
*
*/
public class HtmlEncoder {
/**
* The list of characters to convert and convertion
*/
private static final String[] ENTITIES = { ">", ">", "<", "<", "&", "&", "\"", """, "'", "'", "\\", "\", "\u00a9", "©",
"\u00ae", "®" };
private static Hashtable<String, String> entityTableEncode = null;
/**
* Create an hashTable from ENTITIES
*
*/
protected static synchronized void buildEntityTables() {
entityTableEncode = new Hashtable<String, String>(ENTITIES.length);
for (int i = 0; i < ENTITIES.length; i += 2) {
if (!entityTableEncode.containsKey(ENTITIES[i])) {
entityTableEncode.put(ENTITIES[i], ENTITIES[i + 1]);
}
}
}
/**
*
* Converts a String to HTML by converting all special characters to HTML-entities.
*
* @param s
* The String to convert
* @return The converted String
*/
public static String encode(String s) {
if (entityTableEncode == null) {
buildEntityTables();
}
if (s == null) {
return "";
}
StringBuilder sb = new StringBuilder(s.length() * 2);
char ch;
for (int i = 0; i < s.length(); ++i) {
ch = s.charAt(i);
if ((ch >= 63 && ch <= 90) || (ch >= 97 && ch <= 122) || (ch == ' ')) {
sb.append(ch);
} else if (ch == '\n') {
sb.append("\n");
} else {
String chEnc = (String) entityTableEncode.get(ch);
if (chEnc != null) {
sb.append(chEnc);
} else {
// Not 7 Bit use the unicode system
sb.append("&#");
sb.append(new Integer(ch).toString());
sb.append(';');
}
}
}
return sb.toString();
}
}