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Java > Open Source Codes > com > mckoi > database > FunctionLookup


1 /**
2  * com.mckoi.database.FunctionLookup 07 Sep 2001
3  *
4  * Mckoi SQL Database ( http://www.mckoi.com/database )
5  * Copyright (C) 2000, 2001, 2002 Diehl and Associates, Inc.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * Version 2 as published by the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License Version 2 for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * Version 2 along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  *
20  * Change Log:
21  *
22  *
23  */
24
25 package com.mckoi.database;
26
27 /**
28  * An interface that resolves and generates a Function objects given a
29  * FunctionDef object.
30  *
31  * @author Tobias Downer
32  */
33
34 public interface FunctionLookup {
35
36   /**
37    * Generate the Function given a FunctionDef object. Returns null if the
38    * FunctionDef can not be resolved to a valid function object. If the
39    * specification of the function is invalid for some reason (the number or
40    * type of the parameters is incorrect) then a StatementException is thrown.
41    */
42   Function generateFunction(FunctionDef function_def);
43
44   /**
45    * Returns true if the function defined by FunctionDef is an aggregate
46    * function, or false otherwise.
47    */
48   boolean isAggregate(FunctionDef function_def);
49   
50 }
51
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