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+/* Dictionary.java -- an abstract (and essentially worthless) 
+   class which is Hashtable's superclass
+   Copyright (C) 1998, 2001, 2002 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.util;
+
+/**
+ * A Dictionary maps keys to values; <i>how</i> it does that is
+ * implementation-specific.
+ * 
+ * This is an abstract class which has really gone by the wayside.
+ * People at Javasoft are probably embarrassed by it.  At this point,
+ * it might as well be an interface rather than a class, but it remains
+ * this poor, laughable skeleton for the sake of backwards compatibility.
+ * At any rate, this was what came before the {@link Map} interface 
+ * in the Collections framework.
+ *
+ * @author Jon Zeppieri
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @see Map
+ * @see Hashtable
+ * @since 1.0
+ * @status updated to 1.4
+ */
+public abstract class Dictionary
+{
+  // WARNING: Dictionary is a CORE class in the bootstrap cycle. See the
+  // comments in vm/reference/java/lang/Runtime for implications of this fact.
+
+  /**
+   * Sole constructor (often called implicitly).
+   */
+  public Dictionary()
+  {
+  }
+
+  /**
+   * Returns an Enumeration of the values in this Dictionary.
+   *
+   * @return an Enumeration of the values
+   * @see #keys()
+   */
+  public abstract Enumeration elements();
+
+  /** 
+   * Returns the value associated with the supplied key, or null
+   * if no such value exists. Since Dictionaries are not allowed null keys
+   * or elements, a null result always means the key is not present.
+   *
+   * @param key the key to use to fetch the value
+   * @return the mapped value
+   * @throws NullPointerException if key is null
+   * @see #put(Object, Object)
+   */
+  public abstract Object get(Object key);
+
+  /**
+   * Returns true when there are no elements in this Dictionary.
+   *
+   * @return <code>size() == 0</code>
+   */
+  public abstract boolean isEmpty();
+
+  /**
+   * Returns an Enumeration of the keys in this Dictionary
+   *
+   * @return an Enumeration of the keys
+   * @see #elements()
+   */
+  public abstract Enumeration keys();
+
+  /**
+   * Inserts a new value into this Dictionary, located by the
+   * supplied key. Dictionary does not support null keys or values, so
+   * a null return can safely be interpreted as adding a new key.
+   *
+   * @param key the key which locates the value
+   * @param value the value to put into the Dictionary
+   * @return the previous value of the key, or null if there was none
+   * @throws NullPointerException if key or value is null
+   * @see #get(Object)
+   */
+  public abstract Object put(Object key, Object value);
+
+  /**
+   * Removes from the Dictionary the value located by the given key. A null
+   * return safely means that the key was not mapped in the Dictionary.
+   *
+   * @param key the key used to locate the value to be removed
+   * @return the value associated with the removed key
+   * @throws NullPointerException if key is null
+   */
+  public abstract Object remove(Object key);
+
+  /**
+   * Returns the number of values currently in this Dictionary.
+   *
+   * @return the number of keys in the Dictionary
+   */
+  public abstract int size();
+} // class Dictionary