1 /*
2 * Copyright (C) 2011 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15 package com.google.common.collect;
16
17 import com.google.common.annotations.GwtCompatible;
18
19 /**
20 * Indicates whether an endpoint of some range is contained in the range itself ("closed") or not
21 * ("open"). If a range is unbounded on a side, it is neither open nor closed on that side; the
22 * bound simply does not exist.
23 *
24 * @since 10.0
25 */
26 @GwtCompatible
27 public enum BoundType {
28 /**
29 * The endpoint value <i>is not</i> considered part of the set ("exclusive").
30 */
31 OPEN {
32 @Override
33 BoundType flip() {
34 return CLOSED;
35 }
36 },
37 /**
38 * The endpoint value <i>is</i> considered part of the set ("inclusive").
39 */
40 CLOSED {
41 @Override
42 BoundType flip() {
43 return OPEN;
44 }
45 };
46
47 /**
48 * Returns the bound type corresponding to a boolean value for inclusivity.
49 */
50 static BoundType forBoolean(boolean inclusive) {
51 return inclusive ? CLOSED : OPEN;
52 }
53
54 abstract BoundType flip();
55 }