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diff --git a/libjava/classpath/javax/naming/RefAddr.java b/libjava/classpath/javax/naming/RefAddr.java
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+++ b/libjava/classpath/javax/naming/RefAddr.java
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+/* RefAddr.java -- Abstract superclass of addresses used in References
+   Copyright (C) 2000, 2001 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 javax.naming;
+
+import java.io.Serializable;
+
+/**
+ * Abstract superclass of addresses used in References.
+ * A <code>Reference</code> object contains a <code>Vector</code> of
+ * <code>RefAddr</code>s which are used to reference/address the object.
+ * This abstract superclass keeps track of the type of address, which will be
+ * returned by <code>getType()</code>. And defines a abstract method
+ * <code>getContent()</code> which must be implemented in concrete subclasses
+ * such as <code>BinaryRefAddr</code> and <code>StringRefAddr</code>.
+ *
+ * @see Reference
+ * @see BinaryRefAddr
+ * @see StringRefAddr
+ * @since 1.3
+ * @author Anthony Green (green@redhat.com)
+ * @author Mark Wielaard (mark@klomp.org)
+ */
+public abstract class RefAddr implements Serializable
+{
+  /**
+   * The string resprenstation of the type of address.
+   * Set by the constructor and returned by the getType() method.
+   */
+  protected String addrType;
+
+  /**
+   * Protected constructor for use by subclasses.
+   * Sets the addrType field of this object to the supplied String.
+   *
+   * @exception NullPointerException if the supplied String is null.
+   */
+  protected RefAddr(String addrType)
+  {
+        if (addrType == null)
+          throw new NullPointerException("addrType cannot be null");
+
+    this.addrType = addrType;
+  }
+
+  /**
+   * Returns the non-null address type given to the constructor.
+   */
+  public String getType()
+  {
+    return addrType;
+  }
+
+  /**
+   * Returns the possibly null content of this RefAddr.
+   * The actual value is defined by the non-abstract subclass.
+   */
+  public abstract Object getContent();
+
+  /**
+   * Checks if the object is a RefAddr with the same type and content.
+   *
+   * @return true if the given object is an instance of RefAddr, the addrType
+   *         is the same as this addrType and the content is equals to the
+   *         content of this object.
+   */
+  public boolean equals(Object o)
+  {
+    if (o instanceof RefAddr)
+      {
+        RefAddr refAddr = (RefAddr) o;
+        if (this.getType().equals(refAddr.getType()))
+        {
+          Object c1 = this.getContent();
+          Object c2 = refAddr.getContent();
+          if (c1 == null)
+            return c2 == null;
+          else
+            return c1.equals(c2);
+        }
+      }
+    return false;
+  }
+
+  /**
+   * Returns the hashCode which is the hasCode of the String returned by
+   * <code>getType()</code> plus the hashCode of the Object returned by
+   * <code>getContent</code> (when not null).
+   */
+  public int hashCode()
+  {
+    int result = getType().hashCode();
+    Object o = getContent();
+    if (o != null)
+      result += o.hashCode();
+
+    return result;
+  }
+
+  /**
+   * Returns a String representation of the RefAddr.
+   * Should only be used for debugging purposes.
+   */
+  public String toString()
+  {
+    return "[RefAddr type: " + getType() + " content: " + getContent() + ']';
+  }
+}