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Java > Open Source Codes > smallsql > database > ExpressionFunctionReturnP1Number


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  * ExpressionFunctionReturnP1Number.java
29  * ---------------
30  * Author: Volker Berlin
31  *
32  * Created on 03.10.2005
33  */

34 package smallsql.database;
35
36 abstract class ExpressionFunctionReturnP1Number extends ExpressionFunctionReturnP1 {
37
38
39     final boolean getBoolean() throws Exception JavaDoc{
40         return getDouble() != 0;
41     }
42     
43
44     final int getInt() throws Exception JavaDoc {
45         return Utils.long2int(getLong());
46     }
47     
48
49     final long getLong() throws Exception JavaDoc{
50         return Utils.double2long(getDouble());
51     }
52     
53
54     final float getFloat() throws Exception JavaDoc {
55         return (float)getDouble();
56     }
57     
58
59     MutableNumeric getNumeric() throws Exception JavaDoc{
60         if(param1.isNull()) return null;
61         switch(getDataType()){
62             case SQLTokenizer.INT:
63                 return new MutableNumeric(getInt());
64             case SQLTokenizer.BIGINT:
65                 return new MutableNumeric(getLong());
66             case SQLTokenizer.MONEY:
67                 return new MutableNumeric(getMoney(), 4);
68             case SQLTokenizer.DECIMAL:
69                 MutableNumeric num = param1.getNumeric();
70                 num.floor();
71                 return num;
72             case SQLTokenizer.DOUBLE:
73                 return new MutableNumeric(getDouble());
74             default:
75                 throw new Error JavaDoc();
76         }
77     }
78     
79     
80     long getMoney() throws Exception JavaDoc{
81         return Utils.doubleToMoney(getDouble());
82     }
83     
84     
85     String JavaDoc getString() throws Exception JavaDoc {
86         if(isNull()) return null;
87         return getObject().toString();
88     }
89     
90     
91     final int getDataType() {
92         return ExpressionArithmetic.getBestNumberDataType(param1.getDataType());
93     }
94
95     
96
97
98 }
99
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