01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: *
17: */
18:
19: package org.apache.lenya.ac;
20:
21: import java.io.Serializable;
22: import java.util.Collections;
23:
24: /**
25: * The world.
26: * @version $Id: World.java 473861 2006-11-12 03:51:14Z gregor $
27: */
28: public final class World implements Identifiable, Serializable {
29:
30: /**
31: *
32: */
33: private static final long serialVersionUID = 1L;
34:
35: /**
36: * Creates a new World object.
37: */
38: private World() {
39: // do nothing
40: }
41:
42: private static World instance;
43:
44: /**
45: * Returns the singleton world object.
46: * @return A world object.
47: */
48: public static World getInstance() {
49: if (instance == null) {
50: instance = new World();
51: }
52:
53: return instance;
54: }
55:
56: /**
57: * @see org.apache.lenya.ac.Accreditable#getAccreditables()
58: */
59: public Accreditable[] getAccreditables() {
60: return (Accreditable[]) Collections.singleton(this ).toArray(
61: new Accreditable[1]);
62: }
63: }
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