01: /**
02: * com.mckoi.database.ExpressionPreparer 09 Sep 2001
03: *
04: * Mckoi SQL Database ( http://www.mckoi.com/database )
05: * Copyright (C) 2000, 2001, 2002 Diehl and Associates, Inc.
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * 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: */package com.mckoi.database;
24:
25: /**
26: * An interface used to prepare an Expression object. This interface is used
27: * to mutate an element of an Expression from one form to another. For
28: * example, we may use this to translate a StatementTree object to a
29: * Statement object.
30: *
31: * @author Tobias Downer
32: */
33:
34: public interface ExpressionPreparer {
35:
36: /**
37: * Returns true if this preparer will prepare the given object in an
38: * expression.
39: */
40: boolean canPrepare(Object element);
41:
42: /**
43: * Returns the new translated object to be mutated from the given element.
44: */
45: Object prepare(Object element) throws DatabaseException;
46:
47: }
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