ExpressionPreparer


1   /**
2    * com.mckoi.database.ExpressionPreparer  09 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 used to prepare an Expression object.  This interface is used
29   * to mutate an element of an Expression from one form to another.  For
30   * example, we may use this to translate a StatementTree object to a
31   * Statement object.
32   *
33   * @author Tobias Downer
34   */
35  
36  public interface ExpressionPreparer {
37  
38    /**
39     * Returns true if this preparer will prepare the given object in an
40     * expression.
41     */
42    boolean canPrepare(Object   element);
43  
44    /**
45     * Returns the new translated object to be mutated from the given element.
46     */
47    Object   prepare(Object   element) throws DatabaseException;
48  
49  }
50

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