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