minwin-gcc-5-2/libjava/classpath/java/security/IntersectingDomainCombiner.java

/* IntersectingDomainCombiner.java --
   Copyright (C) 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.

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General Public License for more details.

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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
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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
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package java.security;

import java.util.HashSet;

/**
 * A trivial implementation of {@link DomainCombiner} that produces the
 * intersection of the supplied {@link ProtectionDomain} objects.
 */
final class IntersectingDomainCombiner implements DomainCombiner
{

  // Contstant.
  // -------------------------------------------------------------------------

  static final IntersectingDomainCombiner SINGLETON = new IntersectingDomainCombiner();

  // Constructor.
  // -------------------------------------------------------------------------

  private IntersectingDomainCombiner()
  {
  }

  // Methods.
  // -------------------------------------------------------------------------

  public ProtectionDomain[] combine (ProtectionDomain[] currentDomains,
                                     ProtectionDomain[] assignedDomains)
  {
    HashSet newDomains = new HashSet ();
    for (int i = 0; i < currentDomains.length; i++)
      {
        if (currentDomains[i] == null)
          continue;
        for (int j = 0; j < assignedDomains.length; j++)
          {
            if (currentDomains[i].equals (assignedDomains[j]))
              newDomains.add (currentDomains[i]);
          }
      }
    return (ProtectionDomain[])
      newDomains.toArray(new ProtectionDomain[newDomains.size()]);
  }
}