01 /* This file is part of the project "Hilbert II" - http://www.qedeq.org
02 *
03 * Copyright 2000-2011, Michael Meyling <mime@qedeq.org>.
04 *
05 * "Hilbert II" is free software; you can redistribute
06 * it and/or modify it under the terms of the GNU General Public
07 * License as published by the Free Software Foundation; either
08 * version 2 of the License, or (at your option) any later version.
09 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16 package org.qedeq.kernel.bo.logic.common;
17
18
19
20 /**
21 * Check if a function is already defined.
22 *
23 * @author Michael Meyling
24 */
25 public interface FunctionExistenceChecker {
26
27 /**
28 * Check if a function is already defined.
29 *
30 * @param name Function name.
31 * @param arguments Number of operands for the function.
32 * @return Functions is defined.
33 */
34 public boolean functionExists(String name, int arguments);
35
36 /**
37 * Check if a function is already defined.
38 *
39 * @param function Function.
40 * @return Functions is defined.
41 */
42 public boolean functionExists(FunctionKey function);
43
44 /**
45 * Check if given function key has an initial function definition.
46 *
47 * @param function Function key.
48 * @return Function is defined and is an initial function definition.
49 */
50 public boolean isInitialFunction(final FunctionKey function);
51
52 }
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