1 package org.djutils.immutablecollections;
2
3 /**
4 * Indicate whether the immutable collection contains a COPY of the collection (neither changeable by the user of the immutable
5 * collection, nor by anyone holding a pointer to the original collection), or a WRAP for the original collection (not
6 * changeable by the user of the immutable collection, but can be changed by anyone holding a pointer to the original collection
7 * that is wrapped).
8 * <p>
9 * Copyright (c) 2016-2021 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
10 * for project information <a href="https://djutils.org" target="_blank"> https://djutils.org</a>. The DJUTILS project is
11 * distributed under a three-clause BSD-style license, which can be found at
12 * <a href="https://djutils.org/docs/license.html" target="_blank"> https://djutils.org/docs/license.html</a>.
13 * </p>
14 * @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
15 * @author <a href="https://www.tudelft.nl/staff/p.knoppers/">Peter Knoppers</a>
16 */
17 public enum Immutable
18 {
19 /**
20 * A copy is neither changeable by the user of the immutable collection, nor by anyone holding a pointer to the original
21 * collection that is put into the immutable collection.
22 */
23 COPY,
24
25 /**
26 * A wrapped immutable collection is not changeable by the user of the immutable collection, but can be changed by anyone
27 * holding a pointer to the original collection that is wrapped.
28 */
29 WRAP;
30
31 /**
32 * @return whether the immutable is a COPY
33 */
34 public boolean isCopy()
35 {
36 return this.equals(COPY);
37 }
38
39 /**
40 * @return whether the immutable is a WRAP
41 */
42 public boolean isWrap()
43 {
44 return this.equals(WRAP);
45 }
46
47 }