198 |
{ |
{ |
199 |
return new BasicPermissionCollection(getClass()); |
return new BasicPermissionCollection(getClass()); |
200 |
} |
} |
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} // class BasicPermission |
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/** |
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* Implements AllPermission.newPermissionCollection, and obeys serialization |
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* of JDK. |
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* |
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* @author Eric Blake <ebb9@email.byu.edu> |
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*/ |
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final class BasicPermissionCollection extends PermissionCollection |
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{ |
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/** |
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* Compatible with JDK 1.1+. |
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*/ |
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private static final long serialVersionUID = 739301742472979399L; |
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/** |
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* The permissions in the collection. |
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* |
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* @serial a hash mapping name to permissions, all of type permClass |
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*/ |
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private final Hashtable permissions = new Hashtable(); |
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/** |
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* If "*" is in the collection. |
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* |
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* @serial true if a permission named "*" is in the collection |
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*/ |
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private boolean all_allowed; |
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/** |
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* The runtime class which all entries in the table must belong to. |
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* |
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* @serial the limiting subclass of this collection |
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*/ |
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private final Class permClass; |
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/** |
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* Construct a collection over the given runtime class. |
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* |
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* @param c the class |
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*/ |
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BasicPermissionCollection(Class c) |
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{ |
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permClass = c; |
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} |
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/** |
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* Add a Permission. It must be of the same type as the permission which |
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* created this collection. |
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* |
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* @param perm the permission to add |
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* @throws IllegalArgumentException if perm is not the correct type |
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* @throws SecurityException if the collection is read-only |
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*/ |
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public void add(Permission perm) |
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{ |
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if (isReadOnly()) |
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throw new SecurityException("readonly"); |
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if (! permClass.isInstance(perm)) |
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throw new IllegalArgumentException("Expecting instance of " + permClass); |
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BasicPermission bp = (BasicPermission) perm; |
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String name = bp.getName(); |
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if (name.equals("*")) |
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all_allowed = true; |
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permissions.put(name, bp); |
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} |
|
201 |
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202 |
/** |
/** |
203 |
* Returns true if this collection implies the given permission. |
* Implements AllPermission.newPermissionCollection, and obeys serialization |
204 |
|
* of JDK. |
205 |
* |
* |
206 |
* @param permission the permission to check |
* @author Eric Blake <ebb9@email.byu.edu> |
|
* @return true if it is implied by this |
|
207 |
*/ |
*/ |
208 |
public boolean implies(Permission permission) |
private static final class BasicPermissionCollection extends PermissionCollection |
209 |
{ |
{ |
210 |
if (! permClass.isInstance(permission)) |
/** |
211 |
return false; |
* Compatible with JDK 1.1+. |
212 |
if (all_allowed) |
*/ |
213 |
return true; |
private static final long serialVersionUID = 739301742472979399L; |
214 |
BasicPermission toImply = (BasicPermission) permission; |
|
215 |
String name = toImply.getName(); |
/** |
216 |
if (name.equals("*")) |
* The permissions in the collection. |
217 |
return false; |
* |
218 |
int prefixLength = name.length(); |
* @serial a hash mapping name to permissions, all of type permClass |
219 |
if (name.endsWith("*")) |
*/ |
220 |
prefixLength -= 2; |
private final Hashtable permissions = new Hashtable(); |
221 |
|
|
222 |
while (true) |
/** |
223 |
{ |
* If "*" is in the collection. |
224 |
if (permissions.get(name) != null) |
* |
225 |
return true; |
* @serial true if a permission named "*" is in the collection |
226 |
prefixLength = name.lastIndexOf('.', prefixLength); |
*/ |
227 |
if (prefixLength < 0) |
private boolean all_allowed; |
228 |
return false; |
|
229 |
name = name.substring(0, prefixLength + 1) + '*'; |
/** |
230 |
} |
* The runtime class which all entries in the table must belong to. |
231 |
} |
* |
232 |
|
* @serial the limiting subclass of this collection |
233 |
/** |
*/ |
234 |
* Enumerate over the collection. |
private final Class permClass; |
235 |
* |
|
236 |
* @return an enumeration of the collection contents |
/** |
237 |
*/ |
* Construct a collection over the given runtime class. |
238 |
public Enumeration elements() |
* |
239 |
{ |
* @param c the class |
240 |
return permissions.elements(); |
*/ |
241 |
} |
BasicPermissionCollection(Class c) |
242 |
} // class BasicPermissionCollection |
{ |
243 |
|
permClass = c; |
244 |
|
} |
245 |
|
|
246 |
|
/** |
247 |
|
* Add a Permission. It must be of the same type as the permission which |
248 |
|
* created this collection. |
249 |
|
* |
250 |
|
* @param perm the permission to add |
251 |
|
* @throws IllegalArgumentException if perm is not the correct type |
252 |
|
* @throws SecurityException if the collection is read-only |
253 |
|
*/ |
254 |
|
public void add(Permission perm) |
255 |
|
{ |
256 |
|
if (isReadOnly()) |
257 |
|
throw new SecurityException("readonly"); |
258 |
|
if (! permClass.isInstance(perm)) |
259 |
|
throw new IllegalArgumentException("Expecting instance of " + permClass); |
260 |
|
BasicPermission bp = (BasicPermission) perm; |
261 |
|
String name = bp.getName(); |
262 |
|
if (name.equals("*")) |
263 |
|
all_allowed = true; |
264 |
|
permissions.put(name, bp); |
265 |
|
} |
266 |
|
|
267 |
|
/** |
268 |
|
* Returns true if this collection implies the given permission. |
269 |
|
* |
270 |
|
* @param permission the permission to check |
271 |
|
* @return true if it is implied by this |
272 |
|
*/ |
273 |
|
public boolean implies(Permission permission) |
274 |
|
{ |
275 |
|
if (! permClass.isInstance(permission)) |
276 |
|
return false; |
277 |
|
if (all_allowed) |
278 |
|
return true; |
279 |
|
BasicPermission toImply = (BasicPermission) permission; |
280 |
|
String name = toImply.getName(); |
281 |
|
if (name.equals("*")) |
282 |
|
return false; |
283 |
|
int prefixLength = name.length(); |
284 |
|
if (name.endsWith("*")) |
285 |
|
prefixLength -= 2; |
286 |
|
|
287 |
|
while (true) |
288 |
|
{ |
289 |
|
if (permissions.get(name) != null) |
290 |
|
return true; |
291 |
|
prefixLength = name.lastIndexOf('.', prefixLength); |
292 |
|
if (prefixLength < 0) |
293 |
|
return false; |
294 |
|
name = name.substring(0, prefixLength + 1) + '*'; |
295 |
|
} |
296 |
|
} |
297 |
|
|
298 |
|
/** |
299 |
|
* Enumerate over the collection. |
300 |
|
* |
301 |
|
* @return an enumeration of the collection contents |
302 |
|
*/ |
303 |
|
public Enumeration elements() |
304 |
|
{ |
305 |
|
return permissions.elements(); |
306 |
|
} |
307 |
|
} // class BasicPermissionCollection |
308 |
|
} // class BasicPermission |