2 * Copyright 2005-2011 the original author or authors.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 package org.wamblee.general;
19 * This class provides a generic typesafe id wrapping a long value.
21 * @author Erik Brakkee
24 * Type the id refers to.
26 public class Id<T> implements Comparable<Id<T>> {
35 * @throws NullPointerException
36 * in case the id is null.
38 public Id(String aId) {
40 throw new NullPointerException("id is null");
46 * @return The underlying id.
48 public String getId() {
53 public int hashCode() {
58 public boolean equals(Object aObj) {
62 if (!(aObj instanceof Id)) {
65 return id.equals(((Id<T>) aObj).id);
69 public String toString() {
74 public int compareTo(Id<T> aId) {
75 return id.compareTo(aId.getId());