001/* SubjectDomainCombiner.java -- domain combiner for Subjects.
002   Copyright (C) 2004, 2005  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.security.auth;
040
041import java.security.DomainCombiner;
042import java.security.Principal;
043import java.security.ProtectionDomain;
044
045import java.util.LinkedList;
046
047public class SubjectDomainCombiner implements DomainCombiner
048{
049
050  // Field.
051  // -------------------------------------------------------------------------
052
053  private final Subject subject;
054
055  // Constructor.
056  // -------------------------------------------------------------------------
057
058  public SubjectDomainCombiner (final Subject subject)
059  {
060    this.subject = subject;
061  }
062
063  // Instance methods.
064  // -------------------------------------------------------------------------
065
066  public ProtectionDomain[] combine (final ProtectionDomain[] current,
067                                     final ProtectionDomain[] assigned)
068  {
069    LinkedList domains = new LinkedList();
070    Principal[] principals = null;
071    if (subject != null)
072      principals = (Principal[]) subject.getPrincipals().toArray (new Principal[0]);
073    if (current != null)
074      {
075        for (int i = 0; i < current.length; i++)
076          {
077            domains.add (new ProtectionDomain (current[i].getCodeSource(),
078                                               current[i].getPermissions(),
079                                               current[i].getClassLoader(),
080                                               principals));
081          }
082      }
083    if (assigned != null)
084      {
085        for (int i = 0; i < assigned.length; i++)
086          {
087            domains.add (assigned[i]);
088          }
089      }
090    return (ProtectionDomain[]) domains.toArray (new ProtectionDomain[domains.size()]);
091  }
092
093  public Subject getSubject()
094  {
095    return subject;
096  }
097}