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Java > Open Source Codes > org > osgi > service > device > Device


1 /*
2  * $Header: /cvshome/build/org.osgi.service.device/src/org/osgi/service/device/Device.java,v 1.10 2006/07/11 00:54:08 hargrave Exp $
3  *
4  * Copyright (c) OSGi Alliance (2000, 2006). All Rights Reserved.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 package org.osgi.service.device;
19
20 /**
21  * <p>
22  * Interface for identifying device services.
23  *
24  * <p>
25  * A service must implement this interface or use the
26  * {@link Constants#DEVICE_CATEGORY} registration property to indicate that it
27  * is a device. Any services implementing this interface or registered with the
28  * <code>DEVICE_CATEGORY</code> property will be discovered by the device manager.
29  *
30  * <p>
31  * Device services implementing this interface give the device manager the
32  * opportunity to indicate to the device that no drivers were found that could
33  * (further) refine it. In this case, the device manager calls the
34  * {@link #noDriverFound} method on the <code>Device</code> object.
35  *
36  * <p>
37  * Specialized device implementations will extend this interface by adding
38  * methods appropriate to their device category to it.
39  *
40  * @version $Revision: 1.10 $
41  * @see Driver
42  */
43 public interface Device {
44     /**
45      * Return value from {@link Driver#match} indicating that the driver cannot
46      * refine the device presented to it by the device manager.
47      *
48      * The value is zero.
49      */
50     public static final int MATCH_NONE = 0;
51
52     /**
53      * Indicates to this <code>Device</code> object that the device manager has
54      * failed to attach any drivers to it.
55      *
56      * <p>
57      * If this <code>Device</code> object can be configured differently, the
58      * driver that registered this <code>Device</code> object may unregister it
59      * and register a different Device service instead.
60      */
61     public void noDriverFound();
62 }
63
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