1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2000 Myles Chippendale
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 * Mylesc Chippendale <mylesc AT paneris.org>
42 * http://paneris.org/
43 * 29 Stanley Road, Oxford, OX4 1QY, UK
44 */
45
46 package org.melati.servlet;
47
48 import java.util.Hashtable;
49
50 import org.melati.Melati;
51
52 /**
53 * A way to implement policies about how to save uploaded files.
54 */
55 public abstract class FormDataAdaptorFactory {
56
57 /**
58 * We need to establish the user and set up any request specific melati stuff
59 * so that we can verify the user has permission for this task, and use
60 * melati Table / Objects to manipulate what the FormDataAdaptor does.
61 *
62 * Please note that when uploading a file for a record that has not yet been
63 * inserted (ie whilst adding), melati.getObject will return null.
64 *
65 * @param melati the {@link Melati}
66 * @param field a {@link MultipartFormField} to process
67 * @return a new {@link FormDataAdaptor}
68 */
69
70 public FormDataAdaptor get(final Melati melati,
71 final MultipartFormField field) {
72
73 final Hashtable<String, FormDataAdaptor> holder = new Hashtable<String, FormDataAdaptor>();
74 if (melati.getDatabase() == null) {
75 holder.put("hereiam",getIt(melati,field));
76 } else {
77 melati.loadTableAndObject();
78 holder.put("hereiam",getIt(melati,field));
79 }
80 return holder.get("hereiam");
81 }
82
83 /**
84 * Implements different policies for saving uploaded files depending
85 * on the details of the file and the state of the application.
86 *
87 * @param melati the state of (this call to) the application
88 * @param field details of the uploaded file
89 * @return an adaptor which will save the contents of the file
90 */
91 public abstract FormDataAdaptor getIt(Melati melati,
92 MultipartFormField field);
93 }
94