176 lines
5.1 KiB
Java
176 lines
5.1 KiB
Java
/* AccessControlContext.java --- Access Control Context Class
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Copyright (C) 1999 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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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/**
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AccessControlContext makes system resource access decsion
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based on permission rights.
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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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It is created by call AccessController.getContext method.
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@author Mark Benvenuto
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@since JDK 1.2
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*/
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public final class AccessControlContext
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{
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private ProtectionDomain protectionDomain[];
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private 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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@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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int i, j, k, count = context.length, count2 = 0;
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for (i = 0, j = 0; i < count; i++)
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{
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for (k = 0; k < i; k++)
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if (context[k] == protectionDomain[i])
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break;
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if (k != i) //it means previous loop did not complete
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continue;
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count2++;
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}
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protectionDomain = new ProtectionDomain[count2];
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for (i = 0, j = 0; i < count2; i++)
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{
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for (k = 0; k < i; k++)
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if (context[k] == protectionDomain[i])
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break;
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if (k != i) //it means previous loop did not complete
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continue;
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protectionDomain[j++] = context[i];
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}
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}
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/**
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Construct a new AccessControlContext with the specified
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ProtectionDomains and DomainCombiner
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@param context The ProtectionDomains to use
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@since JDK 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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this(acc.protectionDomain);
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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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@returns 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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@param perm a permission to check
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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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for (int i = 0; i < protectionDomain.length; i++)
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if (protectionDomain[i].implies(perm) == true)
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return;
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throw new AccessControlException("Permission not granted");
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}
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/**
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Checks if two AccessControlContexts are equal.
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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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@param obj The object to compare this class to
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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.protectionDomain.length != protectionDomain.length)
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return false;
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for (int i = 0; i < protectionDomain.length; i++)
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if (acc.protectionDomain[i] != protectionDomain[i])
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return false;
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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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@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 < protectionDomain.length; i++)
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h ^= protectionDomain[i].hashCode();
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return h;
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}
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}
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