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+/* DefaultComboBoxModel.java --
+   Copyright (C) 2002, 2004, 2005, 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.Vector;
+
+import javax.swing.event.ListDataEvent;
+
+
+/**
+ * A model that stores a list of elements and a selected item (which may be
+ * <code>null</code>).  Changes to the model are signalled to listeners using
+ * {@link ListDataEvent}.  This model is designed for use by the
+ * {@link JComboBox} component.
+ *
+ * @author Andrew Selkirk
+ * @author Olga Rodimina
+ * @author Robert Schuster
+ */
+public class DefaultComboBoxModel extends AbstractListModel
+  implements MutableComboBoxModel, Serializable
+{
+  private static final long serialVersionUID = 6698657703676921904L;
+
+  /**
+   * Storage for the elements in the model's list.
+   */
+  private Vector list;
+
+  /**
+   * The selected item (<code>null</code> indicates no selection).
+   */
+  private Object selectedItem = null;
+
+  /**
+   * Creates a new model, initially empty.
+   */
+  public DefaultComboBoxModel()
+  {
+    list = new Vector();
+  }
+
+  /**
+   * Creates a new model and initializes its item list to the values in the
+   * given array.  The selected item is set to the first item in the array, or
+   * <code>null</code> if the array length is zero.
+   *
+   * @param items  an array containing items for the model (<code>null</code>
+   *               not permitted).
+   *
+   * @throws NullPointerException if <code>items</code> is <code>null</code>.
+   */
+  public DefaultComboBoxModel(Object[] items)
+  {
+    list = new Vector(Arrays.asList(items));
+    if (list.size() > 0)
+      selectedItem = list.get(0);
+  }
+
+  /**
+   * Creates a new model and initializes its item list to the values in the
+   * given vector.  The selected item is set to the first item in the vector,
+   * or <code>null</code> if the vector length is zero.
+   *
+   * @param vector  a vector containing items for the model (<code>null</code>
+   *                not permitted).
+   *
+   * @throws NullPointerException if <code>vector</code> is <code>null</code>.
+   */
+  public DefaultComboBoxModel(Vector<?> vector)
+  {
+    this.list = vector;
+    if (getSize() > 0)
+      selectedItem = vector.get(0);
+  }
+
+  /**
+   * Adds an element to the model's item list and sends a {@link ListDataEvent}
+   * to all registered listeners.  If the new element is the first item added
+   * to the list, and the selected item is <code>null</code>, the new element
+   * is set as the selected item.
+   *
+   * @param object item to add to the model's item list.
+   */
+  public void addElement(Object object)
+  {
+    list.addElement(object);
+    int index = list.size() - 1;
+    fireIntervalAdded(this, index, index);
+    if (list.size() == 1 && selectedItem == null)
+      setSelectedItem(object);
+  }
+
+  /**
+   * Removes the element at the specified index from the model's item list
+   * and sends a {@link ListDataEvent} to all registered listeners.  If the
+   * element removed was the selected item, then the preceding element becomes
+   * the new selected item (or the next element, if there is no preceding
+   * element).
+   *
+   * @param index  the index of the item to remove.
+   *
+   * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of
+   *         bounds.
+   */
+  public void removeElementAt(int index)
+  {
+    int selected = getIndexOf(selectedItem);
+    if (selected == index) // choose a new selected item
+      {
+        if (selected > 0)
+          setSelectedItem(getElementAt(selected - 1));
+        else
+          setSelectedItem(getElementAt(selected + 1));
+      }
+    list.removeElementAt(index);
+    fireIntervalRemoved(this, index, index);
+  }
+
+  /**
+   * Adds an element at the specified index in the model's item list
+   * and sends a {@link ListDataEvent} to all registered listeners.
+   *
+   * @param object element to insert
+   * @param index index specifing position in the list where given element
+   *        should be inserted.
+   *
+   * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of
+   *         bounds.
+   *
+   * @see #addElement(Object)
+   */
+  public void insertElementAt(Object object, int index)
+  {
+    list.insertElementAt(object, index);
+    fireIntervalAdded(this, index, index);
+  }
+
+  /**
+   * Removes an element from the model's item list and sends a
+   * {@link ListDataEvent} to all registered listeners.  If the item to be
+   * removed is the current selected item, a new selected item will be set.
+   * If the element is not found in the model's item list, this method does
+   * nothing.
+   *
+   * @param object  the element to remove.
+   */
+  public void removeElement(Object object)
+  {
+    int index = getIndexOf(object);
+    if (index != -1)
+      removeElementAt(index);
+  }
+
+  /**
+   * Removes all the items from the model's item list, resets and selected item
+   * to <code>null</code>, and sends a {@link ListDataEvent} to all registered
+   * listeners.
+   */
+  public void removeAllElements()
+  {
+    selectedItem = null;
+    int size = getSize();
+    if (size > 0)
+      {
+        list.clear();
+        fireIntervalRemoved(this, 0, size - 1);
+      }
+  }
+
+  /**
+   * Returns the number of items in the model's item list.
+   *
+   * @return The number of items in the model's item list.
+   */
+  public int getSize()
+  {
+    return list.size();
+  }
+
+  /**
+   * Sets the selected item for the model and sends a {@link ListDataEvent} to
+   * all registered listeners.  The start and end index of the event is set to
+   * -1 to indicate the model's selection has changed, and not its contents.
+   *
+   * @param object  the new selected item (<code>null</code> permitted).
+   */
+  public void setSelectedItem(Object object)
+  {
+    // No item is selected and object is null, so no change required.
+    if (selectedItem == null && object == null)
+      return;
+
+    // object is already selected so no change required.
+    if (selectedItem != null && selectedItem.equals(object))
+      return;
+
+    // Simply return if object is not in the list.
+    if (object != null && getIndexOf(object) == -1)
+      return;
+
+    // Here we know that object is either an item in the list or null.
+
+    // Handle the three change cases: selectedItem is null, object is
+    // non-null; selectedItem is non-null, object is null;
+    // selectedItem is non-null, object is non-null and they're not
+    // equal.
+    selectedItem = object;
+    fireContentsChanged(this, -1, -1);
+  }
+
+  /**
+   * Returns the selected item.
+   *
+   * @return The selected item (possibly <code>null</code>).
+   */
+  public Object getSelectedItem()
+  {
+    return selectedItem;
+  }
+
+  /**
+   * Returns the element at the specified index in the model's item list.
+   *
+   * @param index  the element index.
+   *
+   * @return The element at the specified index in the model's item list, or
+   *         <code>null</code> if the <code>index</code> is outside the bounds
+   *         of the list.
+   */
+  public Object getElementAt(int index)
+  {
+    if (index < 0 || index >= list.size())
+      return null;
+    return list.elementAt(index);
+  }
+
+  /**
+   * Returns the index of the specified element in the model's item list.
+   *
+   * @param object  the element.
+   *
+   * @return The index of the specified element in the model's item list.
+   */
+  public int getIndexOf(Object object)
+  {
+    return list.indexOf(object);
+  }
+}