1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2000 William Chesters
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * William Chesters <williamc At paneris.org>
42 * http://paneris.org/~williamc
43 * Obrechtstraat 114, 2517VX Den Haag, The Netherlands
44 */
45
46 package org.melati.poem;
47
48 import java.sql.Types;
49 import java.sql.ResultSet;
50 import java.sql.PreparedStatement;
51 import java.sql.SQLException;
52
53 /**
54 * Normal doubles, dependant upon the database/SQL implementation.
55 */
56 public class DoublePoemType extends AtomPoemType<Double> {
57
58 /** The nullable instance. */
59 public static final DoublePoemType it = new DoublePoemType(true);
60
61 /**
62 * Constructor.
63 * @param nullable whether null is an allowed value
64 */
65 public DoublePoemType(boolean nullable) {
66 super(Types.DOUBLE, "DOUBLE PRECISION", nullable);
67 }
68
69 protected void _assertValidRaw(Object raw) {
70 if (raw != null && !(raw instanceof Double))
71 throw new TypeMismatchPoemException(raw, this);
72 }
73
74 protected Double _getRaw(ResultSet rs, int col) throws SQLException {
75 synchronized (rs) {
76 double x = rs.getDouble(col);
77 return rs.wasNull() ? null : new Double(x); }
78 }
79
80 protected void _setRaw(PreparedStatement ps, int col, Object real)
81 throws SQLException {
82 ps.setDouble(col, ((Double)real).doubleValue());
83 }
84
85 protected Double _rawOfString(String rawString)
86 throws ParsingPoemException {
87 try {
88 return new Double(rawString);
89 }
90 catch (NumberFormatException e) {
91 throw new ParsingPoemException(this, rawString, e);
92 }
93 }
94
95 protected boolean _canRepresent(SQLPoemType<?> other) {
96 return sqlTypeCode() == other.sqlTypeCode() &&
97 other instanceof DoublePoemType;
98 }
99
100 /**
101 * {@inheritDoc}
102 * @see org.melati.poem.PoemType#toDsdType()
103 */
104 public String toDsdType() {
105 return "Double";
106 }
107
108 protected void _saveColumnInfo(ColumnInfo columnInfo)
109 throws AccessPoemException {
110 columnInfo.setTypefactory(PoemTypeFactory.DOUBLE);
111 }
112
113 }