1 /*
   2  * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javax.imageio.spi;
  27 
  28 /**
  29  * An optional interface that may be provided by service provider
  30  * objects that will be registered with a
  31  * <code>ServiceRegistry</code>.  If this interface is present,
  32  * notification of registration and deregistration will be performed.
  33  *
  34  * @see ServiceRegistry
  35  *
  36  */
  37 public interface RegisterableService {
  38 
  39     /**
  40      * Called when an object implementing this interface is added to
  41      * the given <code>category</code> of the given
  42      * <code>registry</code>.  The object may already be registered
  43      * under another category or categories.
  44      *
  45      * @param registry a <code>ServiceRegistry</code> where this
  46      * object has been registered.
  47      * @param category a <code>Class</code> object indicating the
  48      * registry category under which this object has been registered.
  49      */
  50     void onRegistration(ServiceRegistry registry, Class<?> category);
  51 
  52     /**
  53      * Called when an object implementing this interface is removed
  54      * from the given <code>category</code> of the given
  55      * <code>registry</code>.  The object may still be registered
  56      * under another category or categories.
  57      *
  58      * @param registry a <code>ServiceRegistry</code> from which this
  59      * object is being (wholly or partially) deregistered.
  60      * @param category a <code>Class</code> object indicating the
  61      * registry category from which this object is being deregistered.
  62      */
  63     void onDeregistration(ServiceRegistry registry, Class<?> category);
  64 }