1 /*
2 * Grapht, an open source dependency injector.
3 * Copyright 2014-2015 various contributors (see CONTRIBUTORS.txt)
4 * Copyright 2010-2014 Regents of the University of Minnesota
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as
8 * published by the Free Software Foundation; either version 2.1 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
14 * details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc., 51
18 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20 package org.grouplens.grapht.context;
21
22 /**
23 * Multiplicity of element matches - how many times may/must an element match?
24 * @author <a href="http://www.grouplens.org">GroupLens Research</a>
25 */
26 public enum Multiplicity {
27 /**
28 * Match exactly once.
29 */
30 ONE {
31 @Override
32 public boolean isOptional() {
33 return false;
34 }
35
36 @Override
37 public boolean isConsumed() {
38 return true;
39 }
40 },
41 /**
42 * Match zero or more times.
43 */
44 ZERO_OR_MORE {
45 @Override
46 public boolean isOptional() {
47 return true;
48 }
49
50 @Override
51 public boolean isConsumed() {
52 return false;
53 }
54 };
55
56 public abstract boolean isOptional();
57 public abstract boolean isConsumed();
58 }