1 /* 2 * Copyright 2004 Ronald Blaschke. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package org.rblasch.convert.type; 17 18 /*** 19 * @author Ronald Blaschke 20 */ 21 public class NullType extends AbstractType { 22 static NullType valueOf(final String s) throws UnknownTypeException { 23 if ("null".equals(s)) { 24 return getInstance(); 25 } else { 26 throw new UnknownTypeException(s + " is not the null type"); 27 } 28 } 29 30 private static NullType instance = new NullType(); 31 32 static NullType getInstance() { 33 return instance; 34 } 35 36 public String getName() { 37 return "null"; 38 } 39 }