1 /* 2 * Copyright (C) 2007-2010 Júlio Vilmar Gesser. 3 * Copyright (C) 2011, 2013-2016 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 */ register(AstObserver observer)32 void register(AstObserver observer); 33 34 /** 35 * Unregister an observer. If the given observer was not registered there are no effects. 36 */ unregister(AstObserver observer)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 */ isRegistered(AstObserver observer)43 boolean isRegistered(AstObserver observer); 44 } 45