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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2009, 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 sun.security.jgss; | |
| 27 | + | |
| 28 | +import java.lang.reflect.InvocationTargetException; | |
| 29 | +import org.ietf.jgss.*; | |
| 30 | +import java.security.AccessController; | |
| 31 | +import java.security.Provider; | |
| 32 | +import java.security.Security; | |
| 33 | +import java.util.ArrayList; | |
| 34 | +import java.util.HashSet; | |
| 35 | +import java.util.HashMap; | |
| 36 | +import java.util.Enumeration; | |
| 37 | +import java.util.Iterator; | |
| 38 | +import sun.security.jgss.spi.*; | |
| 39 | +import sun.security.jgss.wrapper.NativeGSSFactory; | |
| 40 | +import sun.security.jgss.wrapper.SunNativeProvider; | |
| 41 | +import sun.security.action.GetPropertyAction; | |
| 42 | + | |
| 43 | +/** | |
| 44 | + * This class stores the list of providers that this | |
| 45 | + * GSS-Implementation is configured to use. The GSSManagerImpl class | |
| 46 | + * queries this class whenever it needs a mechanism's factory.<p> | |
| 47 | + * | |
| 48 | + * This class stores an ordered list of pairs of the form | |
| 49 | + * <provider, oid>. When it attempts to instantiate a mechanism | |
| 50 | + * defined by oid o, it steps through the list looking for an entry | |
| 51 | + * with oid=o, or with oid=null. (An entry with oid=null matches all | |
| 52 | + * mechanisms.) When it finds such an entry, the corresponding | |
| 53 | + * provider is approached for the mechanism's factory class. | |
| 54 | + * At instantiation time this list in initialized to contain those | |
| 55 | + * system wide providers that contain a property of the form | |
| 56 | + * "GssApiMechanism.x.y.z..." where "x.y.z..." is a numeric object | |
| 57 | + * identifier with numbers x, y, z, etc. Such a property is defined | |
| 58 | + * to map to that provider's implementation of the MechanismFactory | |
| 59 | + * interface for the mechanism x.y.z... | |
| 60 | + * As and when a MechanismFactory is instantiated, it is | |
| 61 | + * cached for future use. <p> | |
| 62 | + * | |
| 63 | + * An application can cause more providers to be added by means of | |
| 64 | + * the addProviderAtFront and addProviderAtEnd methods on | |
| 65 | + * GSSManager which get delegated to this class. The | |
| 66 | + * addProviderAtFront method can also cause a change in the ordering | |
| 67 | + * of the providers without adding any new providers, by causing a | |
| 68 | + * provider to move up in a list. The method addProviderAtEnd can | |
| 69 | + * only add providers at the end of the list if they are not already | |
| 70 | + * in the list. The rationale is that an application will call | |
| 71 | + * addProviderAtFront when it wants a provider to be used in | |
| 72 | + * preference over the default ones. And it will call | |
| 73 | + * addProviderAtEnd when it wants a provider to be used in case | |
| 74 | + * the system ones don't suffice.<p> | |
| 75 | + * | |
| 76 | + * If a mechanism's factory is being obtained from a provider as a | |
| 77 | + * result of encountering a entryof the form <provider, oid> where | |
| 78 | + * oid is non-null, then the assumption is that the application added | |
| 79 | + * this entry and it wants this mechanism to be obtained from this | |
| 80 | + * provider. Thus is the provider does not actually contain the | |
| 81 | + * requested mechanism, an exception will be thrown. However, if the | |
| 82 | + * entry were of the form <provider, null>, then it is viewed more | |
| 83 | + * liberally and is simply skipped over if the provider does not claim to | |
| 84 | + * support the requested mechanism. | |
| 85 | + */ | |
| 86 | + | |
| 87 | +public final class ProviderList { | |
| 88 | + | |
| 89 | + private static final String PROV_PROP_PREFIX = "GssApiMechanism."; | |
| 90 | + private static final int PROV_PROP_PREFIX_LEN = | |
| 91 | + PROV_PROP_PREFIX.length(); | |
| 92 | + | |
| 93 | + private static final String SPI_MECH_FACTORY_TYPE | |
| 94 | + = "sun.security.jgss.spi.MechanismFactory"; | |
| 95 | + | |
| 96 | + // Undocumented property? | |
| 97 | + private static final String DEFAULT_MECH_PROP = | |
| 98 | + "sun.security.jgss.mechanism"; | |
| 99 | + | |
| 100 | + public static final Oid DEFAULT_MECH_OID; | |
| 101 | + | |
| 102 | + static { | |
| 103 | + /* | |
| 104 | + * Set the default mechanism. Kerberos v5 is the default | |
| 105 | + * mechanism unless it is overridden by a system property. | |
| 106 | + * with a valid OID value | |
| 107 | + */ | |
| 108 | + Oid defOid = null; | |
| 109 | + String defaultOidStr = AccessController.doPrivileged | |
| 110 | + (new GetPropertyAction(DEFAULT_MECH_PROP)); | |
| 111 | + if (defaultOidStr != null) { | |
| 112 | + defOid = GSSUtil.createOid(defaultOidStr); | |
| 113 | + } | |
| 114 | + DEFAULT_MECH_OID = | |
| 115 | + (defOid == null ? GSSUtil.GSS_KRB5_MECH_OID : defOid); | |
| 116 | + } | |
| 117 | + | |
| 118 | + private ArrayList<PreferencesEntry> preferences = | |
| 119 | + new ArrayList<PreferencesEntry>(5); | |
| 120 | + private HashMap<PreferencesEntry, MechanismFactory> factories = | |
| 121 | + new HashMap<PreferencesEntry, MechanismFactory>(5); | |
| 122 | + private HashSet<Oid> mechs = new HashSet<Oid>(5); | |
| 123 | + | |
| 124 | + final private GSSCaller caller; | |
| 125 | + | |
| 126 | + public ProviderList(GSSCaller caller, boolean useNative) { | |
| 127 | + this.caller = caller; | |
| 128 | + Provider[] provList; | |
| 129 | + if (useNative) { | |
| 130 | + provList = new Provider[1]; | |
| 131 | + provList[0] = new SunNativeProvider(); | |
| 132 | + } else { | |
| 133 | + provList = Security.getProviders(); | |
| 134 | + } | |
| 135 | + | |
| 136 | + for (int i = 0; i < provList.length; i++) { | |
| 137 | + Provider prov = provList[i]; | |
| 138 | + try { | |
| 139 | + addProviderAtEnd(prov, null); | |
| 140 | + } catch (GSSException ge) { | |
| 141 | + // Move on to the next provider | |
| 142 | + GSSUtil.debug("Error in adding provider " + | |
| 143 | + prov.getName() + ": " + ge); | |
| 144 | + } | |
| 145 | + } // End of for loop | |
| 146 | + } | |
| 147 | + | |
| 148 | + /** | |
| 149 | + * Determines if the given provider property represents a GSS-API | |
| 150 | + * Oid to MechanismFactory mapping. | |
| 151 | + * @return true if this is a GSS-API property, false otherwise. | |
| 152 | + */ | |
| 153 | + private boolean isMechFactoryProperty(String prop) { | |
| 154 | + return (prop.startsWith(PROV_PROP_PREFIX) || | |
| 155 | + prop.regionMatches(true, 0, // Try ignoring case | |
| 156 | + PROV_PROP_PREFIX, 0, | |
| 157 | + PROV_PROP_PREFIX_LEN)); | |
| 158 | + } | |
| 159 | + | |
| 160 | + private Oid getOidFromMechFactoryProperty(String prop) | |
| 161 | + throws GSSException { | |
| 162 | + | |
| 163 | + String oidPart = prop.substring(PROV_PROP_PREFIX_LEN); | |
| 164 | + return new Oid(oidPart); | |
| 165 | + } | |
| 166 | + | |
| 167 | + // So the existing code do not have to be changed | |
| 168 | + synchronized public MechanismFactory getMechFactory(Oid mechOid) | |
| 169 | + throws GSSException { | |
| 170 | + if (mechOid == null) mechOid = ProviderList.DEFAULT_MECH_OID; | |
| 171 | + return getMechFactory(mechOid, null); | |
| 172 | + } | |
| 173 | + | |
| 174 | + /** | |
| 175 | + * Obtains a MechanismFactory for a given mechanism. If the | |
| 176 | + * specified provider is not null, then the impl from the | |
| 177 | + * provider is used. Otherwise, the most preferred impl based | |
| 178 | + * on the configured preferences is used. | |
| 179 | + * @param mechOid the oid of the desired mechanism | |
| 180 | + * @return a MechanismFactory for the desired mechanism. | |
| 181 | + * @throws GSSException when the specified provider does not | |
| 182 | + * support the desired mechanism, or when no provider supports | |
| 183 | + * the desired mechanism. | |
| 184 | + */ | |
| 185 | + synchronized public MechanismFactory getMechFactory(Oid mechOid, | |
| 186 | + Provider p) | |
| 187 | + throws GSSException { | |
| 188 | + | |
| 189 | + if (mechOid == null) mechOid = ProviderList.DEFAULT_MECH_OID; | |
| 190 | + | |
| 191 | + if (p == null) { | |
| 192 | + // Iterate thru all preferences to find right provider | |
| 193 | + String className; | |
| 194 | + PreferencesEntry entry; | |
| 195 | + | |
| 196 | + Iterator<PreferencesEntry> list = preferences.iterator(); | |
| 197 | + while (list.hasNext()) { | |
| 198 | + entry = list.next(); | |
| 199 | + if (entry.impliesMechanism(mechOid)) { | |
| 200 | + MechanismFactory retVal = getMechFactory(entry, mechOid); | |
| 201 | + if (retVal != null) return retVal; | |
| 202 | + } | |
| 203 | + } // end of while loop | |
| 204 | + throw new GSSExceptionImpl(GSSException.BAD_MECH, mechOid); | |
| 205 | + } else { | |
| 206 | + // Use the impl from the specified provider; return null if the | |
| 207 | + // the mech is unsupported by the specified provider. | |
| 208 | + PreferencesEntry entry = new PreferencesEntry(p, mechOid); | |
| 209 | + return getMechFactory(entry, mechOid); | |
| 210 | + } | |
| 211 | + } | |
| 212 | + | |
| 213 | + /** | |
| 214 | + * Helper routine that uses a preferences entry to obtain an | |
| 215 | + * implementation of a MechanismFactory from it. | |
| 216 | + * @param e the preferences entry that contains the provider and | |
| 217 | + * either a null of an explicit oid that matched the oid of the | |
| 218 | + * desired mechanism. | |
| 219 | + * @param mechOid the oid of the desired mechanism | |
| 220 | + * @throws GSSException If the application explicitly requested | |
| 221 | + * this entry's provider to be used for the desired mechanism but | |
| 222 | + * some problem is encountered | |
| 223 | + */ | |
| 224 | + private MechanismFactory getMechFactory(PreferencesEntry e, Oid mechOid) | |
| 225 | + throws GSSException { | |
| 226 | + Provider p = e.getProvider(); | |
| 227 | + | |
| 228 | + /* | |
| 229 | + * See if a MechanismFactory was previously instantiated for | |
| 230 | + * this provider and mechanism combination. | |
| 231 | + */ | |
| 232 | + PreferencesEntry searchEntry = new PreferencesEntry(p, mechOid); | |
| 233 | + MechanismFactory retVal = factories.get(searchEntry); | |
| 234 | + if (retVal == null) { | |
| 235 | + /* | |
| 236 | + * Apparently not. Now try to instantiate this class from | |
| 237 | + * the provider. | |
| 238 | + */ | |
| 239 | + String prop = PROV_PROP_PREFIX + mechOid.toString(); | |
| 240 | + String className = p.getProperty(prop); | |
| 241 | + if (className != null) { | |
| 242 | + retVal = getMechFactoryImpl(p, className, mechOid, caller); | |
| 243 | + factories.put(searchEntry, retVal); | |
| 244 | + } else { | |
| 245 | + /* | |
| 246 | + * This provider does not support this mechanism. | |
| 247 | + * If the application explicitly requested that | |
| 248 | + * this provider be used for this mechanism, then | |
| 249 | + * throw an exception | |
| 250 | + */ | |
| 251 | + if (e.getOid() != null) { | |
| 252 | + throw new GSSExceptionImpl(GSSException.BAD_MECH, | |
| 253 | + "Provider " + p.getName() + | |
| 254 | + " does not support mechanism " + mechOid); | |
| 255 | + } | |
| 256 | + } | |
| 257 | + } | |
| 258 | + return retVal; | |
| 259 | + } | |
| 260 | + | |
| 261 | + /** | |
| 262 | + * Helper routine to obtain a MechanismFactory implementation | |
| 263 | + * from the same class loader as the provider of this | |
| 264 | + * implementation. | |
| 265 | + * @param p the provider whose classloader must be used for | |
| 266 | + * instantiating the desired MechanismFactory | |
| 267 | + * @ param className the name of the MechanismFactory class | |
| 268 | + * @throws GSSException If some error occurs when trying to | |
| 269 | + * instantiate this MechanismFactory. | |
| 270 | + */ | |
| 271 | + private static MechanismFactory getMechFactoryImpl(Provider p, | |
| 272 | + String className, | |
| 273 | + Oid mechOid, | |
| 274 | + GSSCaller caller) | |
| 275 | + throws GSSException { | |
| 276 | + | |
| 277 | + try { | |
| 278 | + Class<?> baseClass = Class.forName(SPI_MECH_FACTORY_TYPE); | |
| 279 | + | |
| 280 | + /* | |
| 281 | + * Load the implementation class with the same class loader | |
| 282 | + * that was used to load the provider. | |
| 283 | + * In order to get the class loader of a class, the | |
| 284 | + * caller's class loader must be the same as or an ancestor of | |
| 285 | + * the class loader being returned. Otherwise, the caller must | |
| 286 | + * have "getClassLoader" permission, or a SecurityException | |
| 287 | + * will be thrown. | |
| 288 | + */ | |
| 289 | + | |
| 290 | + ClassLoader cl = p.getClass().getClassLoader(); | |
| 291 | + Class<?> implClass; | |
| 292 | + if (cl != null) { | |
| 293 | + implClass = cl.loadClass(className); | |
| 294 | + } else { | |
| 295 | + implClass = Class.forName(className); | |
| 296 | + } | |
| 297 | + | |
| 298 | + if (baseClass.isAssignableFrom(implClass)) { | |
| 299 | + | |
| 300 | + java.lang.reflect.Constructor<?> c = | |
| 301 | + implClass.getConstructor(GSSCaller.class); | |
| 302 | + MechanismFactory mf = (MechanismFactory) (c.newInstance(caller)); | |
| 303 | + | |
| 304 | + if (mf instanceof NativeGSSFactory) { | |
| 305 | + ((NativeGSSFactory) mf).setMech(mechOid); | |
| 306 | + } | |
| 307 | + return mf; | |
| 308 | + } else { | |
| 309 | + throw createGSSException(p, className, "is not a " + | |
| 310 | + SPI_MECH_FACTORY_TYPE, null); | |
| 311 | + } | |
| 312 | + } catch (ClassNotFoundException e) { | |
| 313 | + throw createGSSException(p, className, "cannot be created", e); | |
| 314 | + } catch (NoSuchMethodException e) { | |
| 315 | + throw createGSSException(p, className, "cannot be created", e); | |
| 316 | + } catch (InvocationTargetException e) { | |
| 317 | + throw createGSSException(p, className, "cannot be created", e); | |
| 318 | + } catch (InstantiationException e) { | |
| 319 | + throw createGSSException(p, className, "cannot be created", e); | |
| 320 | + } catch (IllegalAccessException e) { | |
| 321 | + throw createGSSException(p, className, "cannot be created", e); | |
| 322 | + } catch (SecurityException e) { | |
| 323 | + throw createGSSException(p, className, "cannot be created", e); | |
| 324 | + } | |
| 325 | + } | |
| 326 | + | |
| 327 | + // Only used by getMechFactoryImpl | |
| 328 | + private static GSSException createGSSException(Provider p, | |
| 329 | + String className, | |
| 330 | + String trailingMsg, | |
| 331 | + Exception cause) { | |
| 332 | + String errClassInfo = className + " configured by " + | |
| 333 | + p.getName() + " for GSS-API Mechanism Factory "; | |
| 334 | + return new GSSExceptionImpl(GSSException.BAD_MECH, | |
| 335 | + errClassInfo + trailingMsg, | |
| 336 | + cause); | |
| 337 | + } | |
| 338 | + | |
| 339 | + public Oid[] getMechs() { | |
| 340 | + return mechs.toArray(new Oid[] {}); | |
| 341 | + } | |
| 342 | + | |
| 343 | + synchronized public void addProviderAtFront(Provider p, Oid mechOid) | |
| 344 | + throws GSSException { | |
| 345 | + | |
| 346 | + PreferencesEntry newEntry = new PreferencesEntry(p, mechOid); | |
| 347 | + PreferencesEntry oldEntry; | |
| 348 | + boolean foundSomeMech; | |
| 349 | + | |
| 350 | + Iterator<PreferencesEntry> list = preferences.iterator(); | |
| 351 | + while (list.hasNext()) { | |
| 352 | + oldEntry = list.next(); | |
| 353 | + if (newEntry.implies(oldEntry)) | |
| 354 | + list.remove(); | |
| 355 | + } | |
| 356 | + | |
| 357 | + if (mechOid == null) { | |
| 358 | + foundSomeMech = addAllMechsFromProvider(p); | |
| 359 | + } else { | |
| 360 | + String oidStr = mechOid.toString(); | |
| 361 | + if (p.getProperty(PROV_PROP_PREFIX + oidStr) == null) | |
| 362 | + throw new GSSExceptionImpl(GSSException.BAD_MECH, | |
| 363 | + "Provider " + p.getName() | |
| 364 | + + " does not support " | |
| 365 | + + oidStr); | |
| 366 | + mechs.add(mechOid); | |
| 367 | + foundSomeMech = true; | |
| 368 | + } | |
| 369 | + | |
| 370 | + if (foundSomeMech) { | |
| 371 | + preferences.add(0, newEntry); | |
| 372 | + } | |
| 373 | + } | |
| 374 | + | |
| 375 | + synchronized public void addProviderAtEnd(Provider p, Oid mechOid) | |
| 376 | + throws GSSException { | |
| 377 | + | |
| 378 | + PreferencesEntry newEntry = new PreferencesEntry(p, mechOid); | |
| 379 | + PreferencesEntry oldEntry; | |
| 380 | + boolean foundSomeMech; | |
| 381 | + | |
| 382 | + Iterator<PreferencesEntry> list = preferences.iterator(); | |
| 383 | + while (list.hasNext()) { | |
| 384 | + oldEntry = list.next(); | |
| 385 | + if (oldEntry.implies(newEntry)) | |
| 386 | + return; | |
| 387 | + } | |
| 388 | + | |
| 389 | + // System.out.println("addProviderAtEnd: No it is not redundant"); | |
| 390 | + | |
| 391 | + if (mechOid == null) | |
| 392 | + foundSomeMech = addAllMechsFromProvider(p); | |
| 393 | + else { | |
| 394 | + String oidStr = mechOid.toString(); | |
| 395 | + if (p.getProperty(PROV_PROP_PREFIX + oidStr) == null) | |
| 396 | + throw new GSSExceptionImpl(GSSException.BAD_MECH, | |
| 397 | + "Provider " + p.getName() | |
| 398 | + + " does not support " | |
| 399 | + + oidStr); | |
| 400 | + mechs.add(mechOid); | |
| 401 | + foundSomeMech = true; | |
| 402 | + } | |
| 403 | + | |
| 404 | + if (foundSomeMech) { | |
| 405 | + preferences.add(newEntry); | |
| 406 | + } | |
| 407 | + } | |
| 408 | + | |
| 409 | + /** | |
| 410 | + * Helper routine to go through all properties contined in a | |
| 411 | + * provider and add its mechanisms to the list of supported | |
| 412 | + * mechanisms. If no default mechanism has been assinged so far, | |
| 413 | + * it sets the default MechanismFactory and Oid as well. | |
| 414 | + * @param p the provider to query | |
| 415 | + * @return true if there is at least one mechanism that this | |
| 416 | + * provider contributed, false otherwise | |
| 417 | + */ | |
| 418 | + private boolean addAllMechsFromProvider(Provider p) { | |
| 419 | + | |
| 420 | + String prop; | |
| 421 | + boolean retVal = false; | |
| 422 | + | |
| 423 | + // Get all props for this provider | |
| 424 | + Enumeration<Object> props = p.keys(); | |
| 425 | + | |
| 426 | + // See if there are any GSS prop's | |
| 427 | + while (props.hasMoreElements()) { | |
| 428 | + prop = (String) props.nextElement(); | |
| 429 | + if (isMechFactoryProperty(prop)) { | |
| 430 | + // Ok! This is a GSS provider! | |
| 431 | + try { | |
| 432 | + Oid mechOid = getOidFromMechFactoryProperty(prop); | |
| 433 | + mechs.add(mechOid); | |
| 434 | + retVal = true; | |
| 435 | + } catch (GSSException e) { | |
| 436 | + // Skip to next property | |
| 437 | + GSSUtil.debug("Ignore the invalid property " + | |
| 438 | + prop + " from provider " + p.getName()); | |
| 439 | + } | |
| 440 | + } // Processed GSS property | |
| 441 | + } // while loop | |
| 442 | + | |
| 443 | + return retVal; | |
| 444 | + | |
| 445 | + } | |
| 446 | + | |
| 447 | + /** | |
| 448 | + * Stores a provider and a mechanism oid indicating that the | |
| 449 | + * provider should be used for the mechanism. If the mechanism | |
| 450 | + * Oid is null, then it indicates that this preference holds for | |
| 451 | + * any mechanism.<p> | |
| 452 | + * | |
| 453 | + * The ProviderList maintains an ordered list of | |
| 454 | + * PreferencesEntry's and iterates thru them as it tries to | |
| 455 | + * instantiate MechanismFactory's. | |
| 456 | + */ | |
| 457 | + private static final class PreferencesEntry { | |
| 458 | + private Provider p; | |
| 459 | + private Oid oid; | |
| 460 | + PreferencesEntry(Provider p, Oid oid) { | |
| 461 | + this.p = p; | |
| 462 | + this.oid = oid; | |
| 463 | + } | |
| 464 | + | |
| 465 | + public boolean equals(Object other) { | |
| 466 | + if (this == other) { | |
| 467 | + return true; | |
| 468 | + } | |
| 469 | + | |
| 470 | + if (!(other instanceof PreferencesEntry)) { | |
| 471 | + return false; | |
| 472 | + } | |
| 473 | + | |
| 474 | + PreferencesEntry that = (PreferencesEntry)other; | |
| 475 | + if (this.p.getName().equals(that.p.getName())) { | |
| 476 | + if (this.oid != null && that.oid != null) { | |
| 477 | + return this.oid.equals(that.oid); | |
| 478 | + } else { | |
| 479 | + return (this.oid == null && that.oid == null); | |
| 480 | + } | |
| 481 | + } | |
| 482 | + | |
| 483 | + return false; | |
| 484 | + } | |
| 485 | + | |
| 486 | + public int hashCode() { | |
| 487 | + int result = 17; | |
| 488 | + | |
| 489 | + result = 37 * result + p.getName().hashCode(); | |
| 490 | + if (oid != null) { | |
| 491 | + result = 37 * result + oid.hashCode(); | |
| 492 | + } | |
| 493 | + | |
| 494 | + return result; | |
| 495 | + } | |
| 496 | + | |
| 497 | + /** | |
| 498 | + * Determines if a preference implies another. A preference | |
| 499 | + * implies another if the latter is subsumed by the | |
| 500 | + * former. e.g., <Provider1, null> implies <Provider1, OidX> | |
| 501 | + * because the null in the former indicates that it should | |
| 502 | + * be used for all mechanisms. | |
| 503 | + */ | |
| 504 | + boolean implies(Object other) { | |
| 505 | + | |
| 506 | + if (other instanceof PreferencesEntry) { | |
| 507 | + PreferencesEntry temp = (PreferencesEntry) other; | |
| 508 | + return (equals(temp) || | |
| 509 | + p.getName().equals(temp.p.getName()) && | |
| 510 | + oid == null); | |
| 511 | + } else { | |
| 512 | + return false; | |
| 513 | + } | |
| 514 | + } | |
| 515 | + | |
| 516 | + Provider getProvider() { | |
| 517 | + return p; | |
| 518 | + } | |
| 519 | + | |
| 520 | + Oid getOid() { | |
| 521 | + return oid; | |
| 522 | + } | |
| 523 | + | |
| 524 | + /** | |
| 525 | + * Determines if this entry is applicable to the desired | |
| 526 | + * mechanism. The entry is applicable to the desired mech if | |
| 527 | + * it contains the same oid or if it contains a null oid | |
| 528 | + * indicating that it is applicable to all mechs. | |
| 529 | + * @param mechOid the desired mechanism | |
| 530 | + * @return true if the provider in this entry should be | |
| 531 | + * queried for this mechanism. | |
| 532 | + */ | |
| 533 | + boolean impliesMechanism(Oid oid) { | |
| 534 | + return (this.oid == null || this.oid.equals(oid)); | |
| 535 | + } | |
| 536 | + | |
| 537 | + // For debugging | |
| 538 | + public String toString() { | |
| 539 | + StringBuffer buf = new StringBuffer("<"); | |
| 540 | + buf.append(p.getName()); | |
| 541 | + buf.append(", "); | |
| 542 | + buf.append(oid); | |
| 543 | + buf.append(">"); | |
| 544 | + return buf.toString(); | |
| 545 | + } | |
| 546 | + } | |
| 547 | +} | |