StreamImageReference


1   /* 
2    * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3    * Copyright (C) 2002-2005 NextApp, Inc.
4    *
5    * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6    *
7    * The contents of this file are subject to the Mozilla Public License Version
8    * 1.1 (the "License"); you may not use this file except in compliance with
9    * the License. You may obtain a copy of the License at
10   * http://www.mozilla.org/MPL/
11   *
12   * Software distributed under the License is distributed on an "AS IS" basis,
13   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14   * for the specific language governing rights and limitations under the
15   * License.
16   *
17   * Alternatively, the contents of this file may be used under the terms of
18   * either the GNU General Public License Version 2 or later (the "GPL"), or
19   * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20   * in which case the provisions of the GPL or the LGPL are applicable instead
21   * of those above. If you wish to allow use of your version of this file only
22   * under the terms of either the GPL or the LGPL, and not to allow others to
23   * use your version of this file under the terms of the MPL, indicate your
24   * decision by deleting the provisions above and replace them with the notice
25   * and other provisions required by the GPL or the LGPL. If you do not delete
26   * the provisions above, a recipient may use your version of this file under
27   * the terms of any one of the MPL, the GPL or the LGPL.
28   */
29  
30  package nextapp.echo2.app;
31  
32  import java.io.IOException  ;
33  import java.io.OutputStream  ;
34  
35  /**
36   * 
37   */
38  public abstract class StreamImageReference 
39  implements ImageReference {
40  
41      /**
42       * Default constructor.
43       */
44      public StreamImageReference() {
45          super();
46      }
47      
48      /**
49       * Returns the valid RFC 1521 image content type (e.g., image/png, 
50       * image/jpeg, image/gif, etc) of the image.
51       * 
52       * @return the content type of the image
53       */
54      public abstract String   getContentType();
55      
56      /**
57       * @see nextapp.echo2.app.ImageReference#getHeight()
58       */
59      public Extent getHeight() {
60          return null;
61      }
62      
63      /**
64       * @see nextapp.echo2.app.ImageReference#getWidth()
65       */
66      public Extent getWidth() {
67          return null;
68      }
69      
70      /**
71       * Renders the image data in its native format to the given output stream.
72       *
73       * @param out the output stream to write the image
74       */
75      public abstract void render(OutputStream   out) 
76      throws IOException  ;
77  }
78
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