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Java > Open Source Codes > javax > emb > MediaConverterSpec


1 /*
2  * JBoss, the OpenSource J2EE webOS
3  *
4  * Distributable under LGPL license. See terms of license at gnu.org.
5  */

6
7 package javax.emb;
8
9 import java.io.Serializable;
10
11 /**
12  * An instance of a class implementing this interface collects all properties
13  * necessary to perform a conversion from a specific source format to a
14  * specific target format. One or more converter spec classes correspond to one
15  * converter class, and the contract for accessing the conversion parameters is
16  * up to the implementers of the converter spec classes.
17  *
18  * <p>A conversion spec instance can be reused for multiple conversions. Also,
19  * implementations of this interface must provide a default constructor that
20  * initializes all properties with suitable values, in order to allow default
21  * conversions. As converter specs sometimes have to be transferred over
22  * machine boundaries, this interface extends {@link java.io.Serializable}.
23  * The design allows various parties to come up with implementations for
24  * various combinations of media formats.
25  *
26  * @version <tt>$Revision: 1.3 $</tt>
27  * @author <a HREF="mailto:ricardoarguello@users.sourceforge.net">Ricardo
28  * ArgŁello</a>
29  */

30 public interface MediaConverterSpec extends Serializable
31 {
32    /**
33     * Returns an object implementing the {@link MediaConverter}interface that
34     * can be used to process conversions using the receiver. The instance
35     * returned is initialized with the receiver to define the conversion
36     * specific parameters.
37     *
38     * @return the media converter.
39     * @throws MediaException if the instantiation of the converter fails.
40     */

41    MediaConverter getConverter() throws MediaException;
42
43    /**
44     * Returns a MIME type as a String that can be used as a default for media
45     * objects created using the receiver. A result of <code>null</code>
46     * indicates that the receiver does not alter the media format of the
47     * content offered on the given input stream.
48     *
49     * @return the target MIME type.
50     */

51    String getTargetMimeType();
52
53    /**
54     * Returns a file extension as a String that can be used as a default for
55     * media objects created using the receiver. The String must not include any
56     * separator characters. A result of <code>null</code> indicates that the
57     * receiver does not alter the media format of the content offered on the
58     * given input stream.
59     *
60     * @return the target file extension.
61     */

62    String getTargetFileExtension();
63 }
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