LDAP Injection Solution

public static final String escapeLDAPSearchFilter(String filter) 
{ 
	// If using JDK >= 1.5 consider using StringBuilder 
	StringBuffer sb = new StringBuffer(); 

	for (int i = 0; i < filter.length(); i++) { 
		char curChar = filter.charAt(i); 
		switch (curChar) { 
		case '\\': 
			sb.append("\\5c"); 
			break; 
		case '*': 
			sb.append("\\2a"); 
			break; 
		case '(': 
			sb.append("\\28"); 
			break; 
		case ')': 
			sb.append("\\29"); 
			break; 
		case '\u0000': 
			sb.append("\\00"); 
			break; 
		default: 
			sb.append(curChar); 
		} 
	} 
	return sb.toString(); 
}