对XML符号的包装类

package edu.basejava.util;

public class XmlSymbol
{
 private enum symbol
 {

  encoding("encoding"), endprefix("</"), endsuffix("/>"), equal(
    "="), prefix("<"), prefixi("<?"), suffix(">"), suffixi("?>"), version(
    "version"),dqm("\""),  white(" "), xml("xml");
  private String value;

  symbol(){}

  symbol(String val)
  {
   value = val;
  }
 }

 public static String endElement(String name)
 {
  return symbol.endprefix.value + name + symbol.suffix.value;
 }

 public static String formatAtt(String name, String value)
 {
  return name + symbol.equal.value + symbol.dqm.value + value
    + symbol.dqm.value;
 }

 public static String formatInstruction(String name,
   LinkedList<Attribute> attributes)
 {
  String rs = null;
  if (name != null)
  {
   rs = symbol.prefixi.value + name;

   for (Attribute ab : attributes)
    rs += (symbol.white.value + ab.toString());
   rs += symbol.suffixi.value;
  }
  return rs;
 }

 public static String newEmptyElement(String name, Attribute... attributes)
 {
  String rs = null;
  if (name != null)
  {
   rs = symbol.prefix.value + name;

   for (Attribute ab : attributes)
    rs += (symbol.white.value + ab.toString());
   rs += symbol.endsuffix.value;
  }
  return rs;
 }

 public static String startElement(String name, Attribute... attributes)
 {
  String rs = null;
  if (name != null)
  {
   rs = symbol.prefix.value + name;

   for (Attribute ab : attributes)
    rs += (symbol.white.value + ab.toString());
   rs += symbol.suffix.value;
  }
  return rs;
 }

 public static String startElement(String name,
   LinkedList<Attribute> attributes)
 {
  String rs = null;
  if (name != null)
  {
   rs = symbol.prefix.value + name;

   for (Attribute ab : attributes)
    rs += (symbol.white.value + ab.toString());
   rs += symbol.suffix.value;
  }
  return rs;
 }
}