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.prepro;
47
48 import java.io.StreamTokenizer;
49 import java.io.IOException;
50
51 /**
52 * A <tt>FieldQualifier</TT> which enables the size of
53 * strings to be specified.
54 */
55 public class SizeFieldQualifier extends FieldQualifier {
56
57 private int size;
58
59 /**
60 * Constructor.
61 *
62 * @param tokens the <code>StreamTokenizer</code> to get tokens from
63 *
64 * @throws ParsingDSDException if an unexpected token is encountered
65 * @throws IOException if something goes wrong with the file system
66 */
67 public SizeFieldQualifier(StreamTokenizer tokens)
68 throws ParsingDSDException, IOException {
69 DSD.expect(tokens, '=');
70 tokens.nextToken();
71 if (tokens.ttype == StreamTokenizer.TT_WORD &&
72 tokens.sval.equals("unlimited"))
73 size = -1;
74 else {
75 if (tokens.ttype != StreamTokenizer.TT_NUMBER || (int)tokens.nval <= 0)
76 throw new ParsingDSDException("<positive size number>", tokens);
77 size = (int)tokens.nval;
78 }
79 tokens.nextToken();
80 }
81
82 /**
83 * Update the model.
84 *
85 * @param field the {@link FieldDef} to update
86 *
87 * @throws SizeApplicationException if the field is a non-sizable field
88 */
89 public void apply(FieldDef field) throws SizeApplicationException {
90 if (field instanceof StringFieldDef)
91 ((StringFieldDef)field).setSize(size);
92 else if (field instanceof BinaryFieldDef)
93 ((BinaryFieldDef)field).setSize(size);
94 else if (field instanceof StringKeyReferenceFieldDef)
95 ((StringKeyReferenceFieldDef)field).setSize(size);
96 else
97 throw new SizeApplicationException(field);
98 }
99 }