| 1 | /* |
|---|---|
| 2 | * Copyright (C) 2007-2010 Júlio Vilmar Gesser. |
| 3 | * Copyright (C) 2011, 2013-2020 The JavaParser Team. |
| 4 | * |
| 5 | * This file is part of JavaParser. |
| 6 | * |
| 7 | * JavaParser can be used either under the terms of |
| 8 | * a) the GNU Lesser General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * b) the terms of the Apache License |
| 12 | * |
| 13 | * You should have received a copy of both licenses in LICENCE.LGPL and |
| 14 | * LICENCE.APACHE. Please refer to those files for details. |
| 15 | * |
| 16 | * JavaParser is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU Lesser General Public License for more details. |
| 20 | */ |
| 21 | |
| 22 | package com.github.javaparser.ast.observer; |
| 23 | |
| 24 | /** |
| 25 | * Observable element. |
| 26 | */ |
| 27 | public interface Observable { |
| 28 | |
| 29 | /** |
| 30 | * Register an observer. |
| 31 | */ |
| 32 | void register(AstObserver observer); |
| 33 | |
| 34 | /** |
| 35 | * Unregister an observer. If the given observer was not registered there are no effects. |
| 36 | */ |
| 37 | void unregister(AstObserver observer); |
| 38 | |
| 39 | /** |
| 40 | * Was this observer registered? |
| 41 | * Note that equals is used to determine if the given observer was registered. |
| 42 | */ |
| 43 | boolean isRegistered(AstObserver observer); |
| 44 | } |
| 45 |