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Java > Open Source Codes > smallsql > database > ExpressionFunctionReturnInt


1 /* =============================================================
2  * SmallSQL : a free Java DBMS library for the Java(tm) platform
3  * =============================================================
4  *
5  * (C) Copyright 2004-2006, by Volker Berlin.
6  *
7  * Project Info: http://www.smallsql.de/
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ---------------
28  * ExpressionFunctionReturnInt.java
29  * ---------------
30  * Author: Volker Berlin
31  *
32  * Created on 21.06.2004
33  */

34 package smallsql.database;
35
36
37 /**
38  * Supper class for functions that return the data type INT
39  * @author Volker Berlin
40  */

41 abstract class ExpressionFunctionReturnInt extends ExpressionFunction {
42
43
44
45     boolean isNull() throws Exception JavaDoc {
46         return param1.isNull();
47     }
48
49
50     final boolean getBoolean() throws Exception JavaDoc {
51         return getInt() != 0;
52     }
53
54
55     final long getLong() throws Exception JavaDoc {
56         return getInt();
57     }
58
59
60     final float getFloat() throws Exception JavaDoc {
61         return getInt();
62     }
63
64
65     final double getDouble() throws Exception JavaDoc {
66         return getInt();
67     }
68
69
70     final long getMoney() throws Exception JavaDoc {
71         return getInt() * 10000;
72     }
73
74
75     final MutableNumeric getNumeric() throws Exception JavaDoc {
76         if(isNull()) return null;
77         return new MutableNumeric(getInt());
78     }
79
80
81     Object JavaDoc getObject() throws Exception JavaDoc {
82         if(isNull()) return null;
83         return Utils.getInteger(getInt());
84     }
85
86
87     final String JavaDoc getString() throws Exception JavaDoc {
88         if(isNull()) return null;
89         return String.valueOf(getInt());
90     }
91
92
93     final int getDataType() {
94         return SQLTokenizer.INT;
95     }
96
97 }
98
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