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Java > Open Source Codes > smallsql > database > ExpressionFunctionReturnString


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  * ExpressionFunctionString.java
29  * ---------------
30  * Author: Volker Berlin
31  *
32  * Created on 23.06.2006
33  */
34 package smallsql.database;
35
36
37 /**
38  * @author Volker Berlin
39  */
40 abstract class ExpressionFunctionReturnString extends ExpressionFunction {
41
42
43     boolean isNull() throws Exception JavaDoc {
44         return param1.isNull();
45     }
46
47
48     final boolean getBoolean() throws Exception JavaDoc {
49         if(isNull()) return false;
50         return Utils.string2boolean(getString().trim());
51     }
52
53
54     final int getInt() throws Exception JavaDoc {
55         if(isNull()) return 0;
56         return Integer.parseInt(getString().trim());
57     }
58
59
60     final long getLong() throws Exception JavaDoc {
61         if(isNull()) return 0;
62         return Long.parseLong(getString().trim());
63     }
64
65
66     final float getFloat() throws Exception JavaDoc {
67         if(isNull()) return 0;
68         return Float.parseFloat(getString().trim());
69     }
70
71
72     final double getDouble() throws Exception JavaDoc {
73         if(isNull()) return 0;
74         return Double.parseDouble(getString().trim());
75     }
76
77
78     final long getMoney() throws Exception JavaDoc {
79         if(isNull()) return 0;
80         return Money.parseMoney(getString().trim());
81     }
82
83
84     final MutableNumeric getNumeric() throws Exception JavaDoc {
85         if(isNull()) return null;
86         return new MutableNumeric(getString().trim());
87     }
88
89
90     final Object JavaDoc getObject() throws Exception JavaDoc {
91         return getString();
92     }
93 }
94
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