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


1 /**
2  * com.mckoi.database.VariableResolver 11 Jul 2000
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 to resolve a variable name to a constant object. This is used
29  * as a way to resolve a variable into a value to use in an expression.
30  *
31  * @author Tobias Downer
32  */
33
34 public interface VariableResolver {
35
36   /**
37    * A number that uniquely identifies the current state of the variable
38    * resolver. This typically returns the row_index of the table we are
39    * resolving variables on.
40    */
41   public int setID();
42
43   /**
44    * Returns the value of a given variable.
45    */
46   public TObject resolve(Variable variable);
47
48   /**
49    * Returns the TType of object the given variable is.
50    */
51   public TType returnTType(Variable variable);
52
53 }
54
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