1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package javax.smartcardio;
27
28 import java.util;
29
30 import java.security;
31
32 import sun.security.jca;
33 import sun.security.jca.GetInstance;
34
35 import sun.security.action.GetPropertyAction;
36
37 /**
38 * A factory for CardTerminal objects.
39 *
40 * It allows an application to
41 * <ul>
42 * <li>obtain a TerminalFactory by calling
43 * one of the static factory methods in this class
44 * ({@linkplain #getDefault} or {@linkplain #getInstance getInstance()}).
45 * <li>use this TerminalFactory object to access the CardTerminals by
46 * calling the {@linkplain #terminals} method.
47 * </ul>
48 *
49 * <p>Each TerminalFactory has a <code>type</code> indicating how it
50 * was implemented. It must be specified when the implementation is obtained
51 * using a {@linkplain #getInstance getInstance()} method and can be retrieved
52 * via the {@linkplain #getType} method.
53 *
54 * <P>The following standard type names have been defined:
55 * <dl>
56 * <dt><code>PC/SC</code>
57 * <dd>an implementation that calls into the PC/SC Smart Card stack
58 * of the host platform.
59 * Implementations do not require parameters and accept "null" as argument
60 * in the getInstance() calls.
61 * <dt><code>None</code>
62 * <dd>an implementation that does not supply any CardTerminals. On platforms
63 * that do not support other implementations,
64 * {@linkplain #getDefaultType} returns <code>None</code> and
65 * {@linkplain #getDefault} returns an instance of a <code>None</code>
66 * TerminalFactory. Factories of this type cannot be obtained by calling the
67 * <code>getInstance()</code> methods.
68 * </dl>
69 * Additional standard types may be defined in the future.
70 *
71 * <p><strong>Note:</strong>
72 * Provider implementations that accept initialization parameters via the
73 * <code>getInstance()</code> methods are strongly
74 * encouraged to use a {@linkplain java.util.Properties} object as the
75 * representation for String name-value pair based parameters whenever
76 * possible. This allows applications to more easily interoperate with
77 * multiple providers than if each provider used different provider
78 * specific class as parameters.
79 *
80 * <P>TerminalFactory utilizes an extensible service provider framework.
81 * Service providers that wish to add a new implementation should see the
82 * {@linkplain TerminalFactorySpi} class for more information.
83 *
84 * @see CardTerminals
85 * @see Provider
86 *
87 * @since 1.6
88 * @author Andreas Sterbenz
89 * @author JSR 268 Expert Group
90 */
91 public final class TerminalFactory {
92
93 private final static String PROP_NAME =
94 "javax.smartcardio.TerminalFactory.DefaultType";
95
96 private final static String defaultType;
97
98 private final static TerminalFactory defaultFactory;
99
100 static {
101 // lookup up the user specified type, default to PC/SC
102 String type = AccessController.doPrivileged
103 (new GetPropertyAction(PROP_NAME, "PC/SC")).trim();
104 TerminalFactory factory = null;
105 try {
106 factory = TerminalFactory.getInstance(type, null);
107 } catch (Exception e) {
108 // ignore
109 }
110 if (factory == null) {
111 // if that did not work, try the Sun PC/SC factory
112 try {
113 type = "PC/SC";
114 Provider sun = Security.getProvider("SunPCSC");
115 if (sun == null) {
116 Class clazz = Class.forName("sun.security.smartcardio.SunPCSC");
117 sun = (Provider)clazz.newInstance();
118 }
119 factory = TerminalFactory.getInstance(type, null, sun);
120 } catch (Exception e) {
121 // ignore
122 }
123 }
124 if (factory == null) {
125 type = "None";
126 factory = new TerminalFactory
127 (NoneFactorySpi.INSTANCE, NoneProvider.INSTANCE, "None");
128 }
129 defaultType = type;
130 defaultFactory = factory;
131 }
132
133 private static final class NoneProvider extends Provider {
134 final static Provider INSTANCE = new NoneProvider();
135 private NoneProvider() {
136 super("None", 1.0d, "none");
137 }
138 }
139
140 private static final class NoneFactorySpi extends TerminalFactorySpi {
141 final static TerminalFactorySpi INSTANCE = new NoneFactorySpi();
142 private NoneFactorySpi() {
143 // empty
144 }
145 protected CardTerminals engineTerminals() {
146 return NoneCardTerminals.INSTANCE;
147 }
148 }
149
150 private static final class NoneCardTerminals extends CardTerminals {
151 final static CardTerminals INSTANCE = new NoneCardTerminals();
152 private NoneCardTerminals() {
153 // empty
154 }
155 public List<CardTerminal> list(State state) throws CardException {
156 if (state == null) {
157 throw new NullPointerException();
158 }
159 return Collections.emptyList();
160 }
161 public boolean waitForChange(long timeout) throws CardException {
162 throw new IllegalStateException("no terminals");
163 }
164 }
165
166 private final TerminalFactorySpi spi;
167
168 private final Provider provider;
169
170 private final String type;
171
172 private TerminalFactory(TerminalFactorySpi spi, Provider provider, String type) {
173 this.spi = spi;
174 this.provider = provider;
175 this.type = type;
176 }
177
178 /**
179 * Get the default TerminalFactory type.
180 *
181 * <p>It is determined as follows:
182 *
183 * when this class is initialized, the system property
184 * <code>javax.smartcardio.TerminalFactory.DefaultType</code>
185 * is examined. If it is set, a TerminalFactory of this type is
186 * instantiated by calling the {@linkplain #getInstance
187 * getInstance(String,Object)} method passing
188 * <code>null</code> as the value for <code>params</code>. If the call
189 * succeeds, the type becomes the default type and the factory becomes
190 * the {@linkplain #getDefault default} factory.
191 *
192 * <p>If the system property is not set or the getInstance() call fails
193 * for any reason, the system defaults to an implementation specific
194 * default type and TerminalFactory.
195 *
196 * @return the default TerminalFactory type
197 */
198 public static String getDefaultType() {
199 return defaultType;
200 }
201
202 /**
203 * Returns the default TerminalFactory instance. See
204 * {@linkplain #getDefaultType} for more information.
205 *
206 * <p>A default TerminalFactory is always available. However, depending
207 * on the implementation, it may not offer any terminals.
208 *
209 * @return the default TerminalFactory
210 */
211 public static TerminalFactory getDefault() {
212 return defaultFactory;
213 }
214
215 /**
216 * Returns a TerminalFactory of the specified type that is initialized
217 * with the specified parameters.
218 *
219 * <p> This method traverses the list of registered security Providers,
220 * starting with the most preferred Provider.
221 * A new TerminalFactory object encapsulating the
222 * TerminalFactorySpi implementation from the first
223 * Provider that supports the specified type is returned.
224 *
225 * <p> Note that the list of registered providers may be retrieved via
226 * the {@linkplain Security#getProviders() Security.getProviders()} method.
227 *
228 * <p>The <code>TerminalFactory</code> is initialized with the
229 * specified parameters Object. The type of parameters
230 * needed may vary between different types of <code>TerminalFactory</code>s.
231 *
232 * @param type the type of the requested TerminalFactory
233 * @param params the parameters to pass to the TerminalFactorySpi
234 * implementation, or null if no parameters are needed
235 * @return a TerminalFactory of the specified type
236 *
237 * @throws NullPointerException if type is null
238 * @throws NoSuchAlgorithmException if no Provider supports a
239 * TerminalFactorySpi of the specified type
240 */
241 public static TerminalFactory getInstance(String type, Object params)
242 throws NoSuchAlgorithmException {
243 Instance instance = GetInstance.getInstance("TerminalFactory",
244 TerminalFactorySpi.class, type, params);
245 return new TerminalFactory((TerminalFactorySpi)instance.impl,
246 instance.provider, type);
247 }
248
249 /**
250 * Returns a TerminalFactory of the specified type that is initialized
251 * with the specified parameters.
252 *
253 * <p> A new TerminalFactory object encapsulating the
254 * TerminalFactorySpi implementation from the specified provider
255 * is returned. The specified provider must be registered
256 * in the security provider list.
257 *
258 * <p> Note that the list of registered providers may be retrieved via
259 * the {@linkplain Security#getProviders() Security.getProviders()} method.
260 *
261 * <p>The <code>TerminalFactory</code> is initialized with the
262 * specified parameters Object. The type of parameters
263 * needed may vary between different types of <code>TerminalFactory</code>s.
264 *
265 * @param type the type of the requested TerminalFactory
266 * @param params the parameters to pass to the TerminalFactorySpi
267 * implementation, or null if no parameters are needed
268 * @param provider the name of the provider
269 * @return a TerminalFactory of the specified type
270 *
271 * @throws NullPointerException if type is null
272 * @throws IllegalArgumentException if provider is null or the empty String
273 * @throws NoSuchAlgorithmException if a TerminalFactorySpi implementation
274 * of the specified type is not available from the specified provider
275 * @throws NoSuchAlgorithmException if no TerminalFactory of the
276 * specified type could be found
277 * @throws NoSuchProviderException if the specified provider could not
278 * be found
279 */
280 public static TerminalFactory getInstance(String type, Object params,
281 String provider) throws NoSuchAlgorithmException, NoSuchProviderException {
282 Instance instance = GetInstance.getInstance("TerminalFactory",
283 TerminalFactorySpi.class, type, params, provider);
284 return new TerminalFactory((TerminalFactorySpi)instance.impl,
285 instance.provider, type);
286 }
287
288 /**
289 * Returns a TerminalFactory of the specified type that is initialized
290 * with the specified parameters.
291 *
292 * <p> A new TerminalFactory object encapsulating the
293 * TerminalFactorySpi implementation from the specified provider object
294 * is returned. Note that the specified provider object does not have to be
295 * registered in the provider list.
296 *
297 * <p>The <code>TerminalFactory</code> is initialized with the
298 * specified parameters Object. The type of parameters
299 * needed may vary between different types of <code>TerminalFactory</code>s.
300 *
301 * @param type the type of the requested TerminalFactory
302 * @param params the parameters to pass to the TerminalFactorySpi
303 * implementation, or null if no parameters are needed
304 * @param provider the provider
305 * @return a TerminalFactory of the specified type
306 *
307 * @throws NullPointerException if type is null
308 * @throws IllegalArgumentException if provider is null
309 * @throws NoSuchAlgorithmException if a TerminalFactorySpi implementation
310 * of the specified type is not available from the specified Provider
311 */
312 public static TerminalFactory getInstance(String type, Object params,
313 Provider provider) throws NoSuchAlgorithmException {
314 Instance instance = GetInstance.getInstance("TerminalFactory",
315 TerminalFactorySpi.class, type, params, provider);
316 return new TerminalFactory((TerminalFactorySpi)instance.impl,
317 instance.provider, type);
318 }
319
320 /**
321 * Returns the provider of this TerminalFactory.
322 *
323 * @return the provider of this TerminalFactory.
324 */
325 public Provider getProvider() {
326 return provider;
327 }
328
329 /**
330 * Returns the type of this TerminalFactory. This is the value that was
331 * specified in the getInstance() method that returned this object.
332 *
333 * @return the type of this TerminalFactory
334 */
335 public String getType() {
336 return type;
337 }
338
339 /**
340 * Returns a new CardTerminals object encapsulating the terminals
341 * supported by this factory.
342 * See the class comment of the {@linkplain CardTerminals} class
343 * regarding how the returned objects can be shared and reused.
344 *
345 * @return a new CardTerminals object encapsulating the terminals
346 * supported by this factory.
347 */
348 public CardTerminals terminals() {
349 return spi.engineTerminals();
350 }
351
352 /**
353 * Returns a string representation of this TerminalFactory.
354 *
355 * @return a string representation of this TerminalFactory.
356 */
357 public String toString() {
358 return "TerminalFactory for type " + type + " from provider "
359 + provider.getName();
360 }
361
362 }
Save This Page