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+/* 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.
+
+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;
+
+/**
+ * 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()]);
+  }
+}