2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
32 import java.io.InputStream;
34 import java.util.List;
36 import mir.entity.Entity;
37 import mir.session.UploadedFile;
40 * Interface for Media handling in Mir. All media handlers
41 * must implement this interface. Each specific media type,
42 * be it Gif, Jpeg, Mp3 audio, Real Audio or quicktime video
43 * has special needs when it comes to representation on the various
44 * pages (article, list, summary), must be stored differently and has a
45 * different URL, etc... This interface allows Mir to support
46 * an infinite (I hope) number of media types. Once this is done,
47 * no code at any other level in Mir needs to be changed other than
48 * adding the content-type <-> media handler name mapping in the
49 * media_type table. The following is an example of the media_type
52 * id | name | mime_type | classname | tablename | dcname<br>
53 *---+---------+--------------------------+-----------+---------------+-------<br>
54 * 2 | unknown | application/octet-stream | -- | UploadedMedia | <br>
55 * 3 | jpg | image/gif | ImagesGif | Images | <br>
56 * 4 | mp3 | audio/mp3 | Audio | UploadedMedia | <br>
58 * The "id" field is used as a mapping in the table that contains the media type
59 * to the media_type table. For example, the images table has a to_media_type
60 * field that contains the id in the media_type table.
62 * The "name" field is used for various display/filenaming purposes. it should
63 * match a valid file extension name for a media_type (we could have used the
64 * content-type map for this....).
66 * The "mime_type" field is the most important as it does maps the type to Java
67 * classes (the storage and media_handler name). We call those classes using
68 * reflection. This way, once a Handler for a specific media type is implemented
69 * and entered into the media_type table, no other Mir code needs to be modified.
71 * The "classname" field is the name of the media handler (e.g MediaHandlerAudio)
72 * we use it to call the MediaHandler methods via reflection.
74 * The "tablename" is the name of the database storage classes (e.g DatabaseImages
75 * and EntityImages). We use this to fetch/storage the media (meta)data in the db.
77 * The "dcname" field is as of yet unused. Do search for "Dublin Core" on google
80 * Most media handlers should just extend MediaHandlerGeneric (i.e inherit from
81 * ) and just override the things that need to be specific. see MediaHandlerAudio
83 * @author <mh@nadir.org>, the Mir-coders group
84 * @version $Id: MediaHandler.java,v 1.1.2.3 2004/11/21 22:07:13 zapata Exp $
87 public interface MediaHandler {
89 * Store the media content from an {@link UploadedFile}
91 public void store(UploadedFile anUploadedFile, Entity aMedia, Entity aMediaType) throws MediaExc, MediaFailure;
94 * Store the media content from an input stream.
96 public void store(InputStream anInputStream, Entity aMedia, Entity aMediaType) throws MediaExc, MediaFailure;
99 * Store the media content from a file.
101 public void store(File aFile, Entity aMedia, Entity aMediaType) throws MediaExc, MediaFailure;
104 * Perform production related tasks for this media.
106 public void produce(Entity aMedia, Entity aMediaType ) throws MediaExc, MediaFailure;
109 * Get's the media data from storage and returns it as an InputStream
110 * Not very useful for most media types as they are stored in a file,
111 * but very usefull for ones stored in the DB as it is necessary to get
112 * it first before making a file out of it (in Producer*).
114 public InputStream getMedia (Entity aMedia, Entity aMediaType) throws MediaExc, MediaFailure;
117 * Pretty much like get() above. But get's the specific Icon
118 * representation. useful for media stored in the DB.
120 public InputStream getThumbnail(Entity aMedia) throws MediaExc, MediaFailure;
124 * Returns the mime-type of the media's thumbnail
126 public String getThumbnailMimeType(Entity aMediaEntity, Entity aMediaType) throws MediaExc, MediaFailure;
129 * Returns the absolute filesystem path to where the media
130 * content should be stored. This path is usually defined
131 * in the configuration wich is accessible through the MirConfig
134 public String getStoragePath () throws MediaExc, MediaFailure;
137 * Returns the *relative* filesystem path to where the media
138 * icon content should be stored. It is relative to the path
139 * returned by getStoragePath()
140 * This path is usually defined
141 * in the configuration wich is accessible through the MirConfig
144 public String getIconStoragePath () throws MediaExc, MediaFailure;
147 * Returns the base URL to that the media is accessible from
148 * to the end user. This could be a URL to another host.
149 * This is used in the Metadata stored in the DB and later on
150 * ,the templates use it.
151 * It is usually defined
152 * in the configuration witch is accessible through the MirConfig
155 public String getPublishHost () throws MediaExc, MediaFailure;
158 * Returns the file name of the Icon representing the media type.
159 * It is used in the summary view.
160 * It is usually defined
161 * in the configuration wich is accessible through the MirConfig
164 public String getBigIconName ();
167 * Returns the file name of the small Icon representing
169 * It is used in the right hand newswire list of the startpage.
170 * It is usually defined
171 * in the configuration wich is accessible through the MirConfig
174 public String getTinyIconName ();
177 * Returns the IMG SRC "ALT" text to be used
178 * for the Icon representations
179 * @return String, the ALT text.
181 public String getIconAltName ();
184 * returns a brief text dscription of what this
188 public String getDescr (Entity aMediaType);