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+/* ObjectIdentityWrapper.java -- Wrapper class used to override equals()
+ and hashCode() to be as discriminating as possible
+ Copyright (C) 1998 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 gnu.java.io;
+
+/**
+ This class is a thin wrapper around <code>Object</code> that makes
+ the methods <code>hashCode()</code> and <code>equals(Object)</code>
+ as discriminating as possible.
+*/
+public class ObjectIdentityWrapper
+{
+
+ /**
+ Constructs a <code>ObjectIdentityWrapper</code> that is wrapped
+ around o.
+ */
+ public ObjectIdentityWrapper( Object o )
+ {
+ object = o;
+ }
+
+ /**
+ Uses <code>System.identityHashCode(Object)</code> to compute a
+ hash code for the object wrapped by this
+ <code>ObjectIdentityWrapper</code>.
+
+ @see java.lang.System#identityHashCode(java.lang.Object)
+ @see java.util.Hashtable
+ @see java.lang.Object#hashCode()
+ */
+ public int hashCode()
+ {
+ return System.identityHashCode( object );
+ }
+
+ /**
+ Uses the <code>==</code> operator to test for equality between
+ the object wrapped by this <code>ObjectIdentityWrapper</code> and
+ the object wrapped by the <code>ObjectIdentityWrapper</code> o.
+ Returns false if o is not a <code>ObjectIdentityWrapper</code>.
+
+ @see java.util.Hashtable
+ @see java.lang.Object#equals()
+ */
+ public boolean equals( Object o )
+ {
+ if( o instanceof ObjectIdentityWrapper )
+ return object == ((ObjectIdentityWrapper)o).object;
+ else
+ return false;
+ }
+
+ public String toString()
+ {
+ return "ObjectIdentityWrapper< " + object + ", " + hashCode() + " >";
+ }
+
+ /**
+ The <code>Object</code> wrapped by this
+ <code>ObjectIdentityWrapper</code>.
+ */
+ public Object object;
+}