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.util.Enumeration;
49
50 import org.melati.poem.util.ArrayEnumeration;
51 import org.melati.poem.util.FlattenedEnumeration;
52 import org.melati.poem.util.MappedEnumeration;
53
54 /**
55 * A metadata type which defines the type of another {@link Column}.
56 *
57 * Used in the {@link ColumnInfoTable} it can take
58 * positive values to indicate a reference to a type defined
59 * in the {@link TableInfoTable} or a negative value to
60 * point to a fundamental type.
61 *
62 * @see PoemTypeFactory#forCode
63 */
64 public class ColumnTypePoemType extends IndexPoemType {
65
66 private Database database;
67
68 /**
69 * Constructor for a non nullable column type.
70 * @param database the db we are dealing with
71 */
72 public ColumnTypePoemType(Database database) {
73 super(false);
74 this.database = database;
75 }
76
77 /**
78 * {@inheritDoc}
79 * @see org.melati.poem.BasePoemType#possibleRaws()
80 */
81 public Enumeration<Integer> possibleRaws() {
82 return
83 new FlattenedEnumeration<Integer>(
84 new MappedEnumeration<Integer,PoemTypeFactory>(
85 new ArrayEnumeration<PoemTypeFactory>(PoemTypeFactory.atomTypeFactories)) {
86 public Integer mapped(PoemTypeFactory factory) {
87 return factory.code;
88 }
89 },
90 database.getTableInfoTable().troidSelection(null, null, false));
91 }
92
93 protected void _assertValidCooked(Object cooked)
94 throws ValidationPoemException {
95 if (!(cooked instanceof PoemTypeFactory))
96 throw new TypeMismatchPoemException(cooked, this);
97 }
98
99 protected Object _cookedOfRaw(Object raw) throws NoSuchRowPoemException {
100 return PoemTypeFactory.forCode(database, ((Integer)raw).intValue());
101 }
102
103 protected Integer _rawOfCooked(Object cooked) {
104 return ((PoemTypeFactory)cooked).code;
105 }
106
107 protected String _stringOfCooked(Object cooked,
108 PoemLocale locale, int style)
109 throws PoemException {
110 return ((PoemTypeFactory)cooked).getDisplayName();
111 }
112
113 protected boolean _canRepresent(SQLPoemType<?> other) {
114 return other instanceof ColumnTypePoemType;
115 }
116
117 protected void _saveColumnInfo(ColumnInfo columnInfo)
118 throws AccessPoemException {
119 columnInfo.setTypefactory(PoemTypeFactory.TYPE);
120 }
121
122 /**
123 * {@inheritDoc}
124 * @see org.melati.poem.BasePoemType#toString()
125 */
126 public String toString() {
127 return "type code (" + super.toString() + ")";
128 }
129
130 /**
131 * {@inheritDoc}
132 * @see org.melati.poem.PoemType#toDsdType()
133 */
134 public String toDsdType() {
135 return "ColumnType";
136 }
137
138 }