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diff --git a/libjava/classpath/javax/swing/InputMap.java b/libjava/classpath/javax/swing/InputMap.java
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+/* InputMap.java --
+   Copyright (C) 2002, 2004, 2006, 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.swing;
+
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Maps {@link KeyStroke}s to arbitrary objects, usually Strings. This
+ * is used in combination with {@link ActionMap}s.
+ *
+ * If a component receives an input event, this is looked up in
+ * the component's <code>InputMap</code>. The result is an object which
+ * serves as a key to the component's <code>ActionMap</code>. Finally
+ * the <code>Action</code> that is stored is executed.
+ *
+ * @author Andrew Selkirk
+ * @author Michael Koch
+ *
+ * @since 1.3
+ */
+public class InputMap
+  implements Serializable
+{
+  private static final long serialVersionUID = -5429059542008604257L;
+
+  /**
+   * Storage for the KeyStroke --> Object mappings.
+   */
+  private Map inputMap;
+
+  /**
+   * An optional parent map.
+   */
+  private InputMap parent;
+
+  /**
+   * Creates a new <code>InputMap</code> instance.  This default instance
+   * contains no mappings and has no parent.
+   */
+  public InputMap()
+  {
+    // nothing to do
+  }
+
+  /**
+   * Returns the binding for the specified keystroke, if there is one.
+   *
+   * @param keystroke the key of the entry (<code>null</code> is ignored).
+   *
+   * @return The binding associated with the specified keystroke (or
+   *     <code>null</code>).
+   */
+  public Object get(KeyStroke keystroke)
+  {
+    Object result = null;
+    if (inputMap != null)
+      result = inputMap.get(keystroke);
+
+    if (result == null && parent != null)
+      result = parent.get(keystroke);
+    return result;
+  }
+
+  /**
+   * Puts a new entry into the <code>InputMap</code>.  If
+   * <code>actionMapKey</code> is <code>null</code> any existing entry will be
+   * removed.
+   *
+   * @param keystroke the keystroke for the entry (<code>null</code> is
+   *     ignored).
+   * @param actionMapKey the action (<code>null</code> permitted).
+   */
+  public void put(KeyStroke keystroke, Object actionMapKey)
+  {
+    if (keystroke == null)
+      return;
+    if (inputMap == null)
+      inputMap = new HashMap();
+    if (actionMapKey == null)
+      inputMap.remove(keystroke);
+    else
+      inputMap.put(keystroke, actionMapKey);
+  }
+
+  /**
+   * Removes an entry from this <code>InputMap</code>.  Note that this will
+   * not remove any entry from the parent map, if there is one.
+   *
+   * @param keystroke the key of the entry to remove (<code>null</code> is
+   *     ignored).
+   */
+  public void remove(KeyStroke keystroke)
+  {
+    if (inputMap != null)
+      inputMap.remove(keystroke);
+  }
+
+  /**
+   * Returns the parent of this <code>InputMap</code>.  The default value
+   * is <code>null</code>.
+   *
+   * @return The parent map (possibly <code>null</code>).
+   *
+   * @see #setParent(InputMap)
+   */
+  public InputMap getParent()
+  {
+    return parent;
+  }
+
+  /**
+   * Sets a parent for this <code>InputMap</code>.  If a parent is specified,
+   * the {@link #get(KeyStroke)} method will look in the parent if it cannot
+   * find an entry in this map.
+   *
+   * @param parentMap the new parent (<code>null</code> permitted).
+   *
+   * @see #getParent()
+   */
+  public void setParent(InputMap parentMap)
+  {
+    parent = parentMap;
+  }
+
+  /**
+   * Returns the number of entries in this <code>InputMap</code>.  This count
+   * does not include any entries from the parent map, if there is one.
+   *
+   * @return The number of entries.
+   */
+  public int size()
+  {
+    int result = 0;
+    if (inputMap != null)
+      result = inputMap.size();
+    return result;
+  }
+
+  /**
+   * Clears the entries from this <code>InputMap</code>.  The parent map, if
+   * there is one, is not cleared.
+   */
+  public void clear()
+  {
+    if (inputMap != null)
+      inputMap.clear();
+  }
+
+  /**
+   * Returns all keys of entries in this <code>InputMap</code>.  This does not
+   * include keys defined in the parent, if there is one (use the
+   * {@link #allKeys()} method for that case).
+   * <br><br>
+   * Following the behaviour of the reference implementation, this method will
+   * return <code>null</code> when no entries have been added to the map,
+   * and a zero length array if entries have been added but subsequently
+   * removed (or cleared) from the map.
+   *
+   * @return An array of keys (may be <code>null</code> or have zero length).
+   */
+  public KeyStroke[] keys()
+  {
+    if (inputMap != null)
+      {
+        KeyStroke[] array = new KeyStroke[size()];
+        return (KeyStroke[]) inputMap.keySet().toArray(array);
+      }
+    return null;
+  }
+
+  /**
+   * Returns all keys of entries in this <code>InputMap</code> and all its
+   * parents.
+   *
+   * @return An array of keys (may be <code>null</code> or have zero length).
+   */
+  public KeyStroke[] allKeys()
+  {
+    Set set = new HashSet();
+
+    if (parent != null)
+      {
+        Object[] parentKeys = parent.allKeys();
+        if (parentKeys != null)
+          set.addAll(Arrays.asList(parentKeys));
+      }
+    if (inputMap != null)
+      set.addAll(inputMap.keySet());
+    if (set.size() == 0)
+      return null;
+    KeyStroke[] array = new KeyStroke[set.size()];
+    return (KeyStroke[]) set.toArray(array);
+  }
+
+}