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Diffstat (limited to 'libjava/classpath/java/security/AccessControlContext.java')
| -rw-r--r-- | libjava/classpath/java/security/AccessControlContext.java | 218 |
1 files changed, 0 insertions, 218 deletions
diff --git a/libjava/classpath/java/security/AccessControlContext.java b/libjava/classpath/java/security/AccessControlContext.java deleted file mode 100644 index fd96475..0000000 --- a/libjava/classpath/java/security/AccessControlContext.java +++ /dev/null @@ -1,218 +0,0 @@ -/* AccessControlContext.java --- Access Control Context Class - Copyright (C) 1999, 2004 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - -package java.security; - -import java.util.HashSet; - -/** - * AccessControlContext makes system resource access decsion - * based on permission rights. - * - * It is used for a specific context and has only one method - * checkPermission. It is similar to AccessController except - * that it makes decsions based on the current context instead - * of the the current thread. - * - * It is created by call AccessController.getContext method. - * - * @author Mark Benvenuto - * @since 1.2 - */ -public final class AccessControlContext -{ - private final ProtectionDomain[] protectionDomains; - private final DomainCombiner combiner; - - /** - * Construct a new AccessControlContext with the specified - * ProtectionDomains. <code>context</code> must not be - * null and duplicates will be removed. - * - * @param context The ProtectionDomains to use - */ - public AccessControlContext(ProtectionDomain[] context) - { - HashSet domains = new HashSet (context.length); - for (int i = 0; i < context.length; i++) - domains.add (context[i]); - protectionDomains = (ProtectionDomain[]) - domains.toArray (new ProtectionDomain[domains.size()]); - combiner = null; - } - - /** - * Construct a new AccessControlContext with the specified - * {@link ProtectionDomain}s and {@link DomainCombiner}. - * - * <p>Code calling this constructor must have a {@link - * SecurityPermission} of <i>createAccessControlContext</i>.</p> - * - * @throws SecurityException If the caller does not have permission - * to create an access control context. - * @since 1.3 - */ - public AccessControlContext(AccessControlContext acc, - DomainCombiner combiner) - { - AccessControlContext acc2 = null; - SecurityManager sm = System.getSecurityManager (); - if (sm != null) - { - Permission perm = - new SecurityPermission ("createAccessControlContext"); - - // The default SecurityManager.checkPermission(perm) just calls - // AccessController.checkPermission(perm) which in turn just - // calls AccessController.getContext().checkPermission(perm). - // This means AccessController.getContext() is called twice, - // once for the security check and once by us. It's a very - // expensive call (on gcj at least) so if we're using the - // default security manager we avoid this duplication. - if (sm.getClass() == SecurityManager.class) - { - acc2 = AccessController.getContext (); - acc2.checkPermission (perm); - } - else - sm.checkPermission (perm); - } - if (acc2 == null) - acc2 = AccessController.getContext (); - protectionDomains = combiner.combine (acc2.protectionDomains, - acc.protectionDomains); - this.combiner = combiner; - } - - AccessControlContext (ProtectionDomain[] domains, AccessControlContext acc, - DomainCombiner combiner) - { - protectionDomains = combiner.combine (domains, acc.protectionDomains); - this.combiner = combiner; - } - - /** - * Returns the Domain Combiner associated with the AccessControlContext - * - * @return the DomainCombiner - */ - public DomainCombiner getDomainCombiner() - { - return combiner; - } - - /** - * Determines whether or not the specific permission is granted - * depending on the context it is within. - * - * @param perm a permission to check - * - * @throws AccessControlException if the permssion is not permitted - */ - public void checkPermission(Permission perm) throws AccessControlException - { - if (protectionDomains.length == 0) - throw new AccessControlException ("permission " - + perm - + " not granted: no protection domains"); - - for (int i = 0; i < protectionDomains.length; i++) - { - final ProtectionDomain domain = protectionDomains[i]; - if (!domain.implies(perm)) - throw new AccessControlException ("permission " - + perm - + " not granted: " - + domain - + " does not imply it."); - } - } - - /** - * Checks if two AccessControlContexts are equal. - * - * It first checks if obj is an AccessControlContext class, and - * then checks if each ProtectionDomain matches. - * - * @param obj The object to compare this class to - * - * @return true if equal, false otherwise - */ - public boolean equals(Object obj) - { - if (obj instanceof AccessControlContext) - { - AccessControlContext acc = (AccessControlContext) obj; - - if (acc.protectionDomains.length != protectionDomains.length) - return false; - - int i, j; - for (i = 0; i < protectionDomains.length; i++) - { - for (j = 0; j < acc.protectionDomains.length; j++) - { - if (acc.protectionDomains[j].equals (protectionDomains[i])) - break; - } - if (j == acc.protectionDomains.length) - return false; - } - return true; - } - return false; - } - - /** - * Computes a hash code of this class - * - * @return a hash code representing this class - */ - public int hashCode() - { - int h = 0; - for (int i = 0; i < protectionDomains.length; i++) - h ^= protectionDomains[i].hashCode(); - - return h; - } - - ProtectionDomain[] getProtectionDomains () - { - return protectionDomains; - } -} |