01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * 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.webrender;
31:
32: import java.util.HashMap;
33: import java.util.Map;
34:
35: /**
36: * A registry of <code>Service</code> objects that may be recalled based
37: * on <code>Id</code> values.
38: */
39: public class ServiceRegistry {
40:
41: /** Maps service Ids to services */
42: private final Map serviceMap = new HashMap();
43:
44: /**
45: * Creates a new <code>ServiceRegistry</code>.
46: */
47: public ServiceRegistry() {
48: super ();
49: }
50:
51: /**
52: * Adds a service to the registry.
53: *
54: * @param service The service to be added.
55: */
56: public synchronized void add(Service service) {
57: if (serviceMap.containsKey(service.getId())
58: && serviceMap.get(service.getId()) != service) {
59: throw new IllegalArgumentException(
60: "Identifier already in use by another service.");
61: }
62: serviceMap.put(service.getId(), service);
63: }
64:
65: /**
66: * Returns the service with the specified <code>Id</code>.
67: *
68: * @param id The <code>Id</code> of the service to be retrieved.
69: * @return The service which is identified by <code>id</code>.
70: */
71: public Service get(String id) {
72: return (Service) serviceMap.get(id);
73: }
74:
75: /**
76: * Removes a service from the registry.
77: *
78: * @param service The service to be removed.
79: */
80: public synchronized void remove(Service service) {
81: serviceMap.remove(service.getId());
82: }
83: }
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