/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package javax.swing;

import java.util.*;

import java.io.Serializable;

/**
 * The default model for combo boxes.
 *
 * @param <E> the type of the elements of this model
 *
 * @author Arnaud Weber
 * @author Tom Santos
 */

public class DefaultComboBoxModel<E> extends AbstractListModel<E> implements MutableComboBoxModel<E>, Serializable {
 Vector<E> objects;
 Object selectedObject;

 /**
 * Constructs an empty DefaultComboBoxModel object.
 */
 public DefaultComboBoxModel() {
 objects = new Vector<E>();
 }

 /**
 * Constructs a DefaultComboBoxModel object initialized with
 * an array of objects.
 *
 * @param items an array of Object objects
 */
 public DefaultComboBoxModel(final E items[]) {
 objects = new Vector<E>(items.length);

 int i,c;
 for ( i=0,c=items.length;i<c;i++ )
 objects.addElement(items[i]);

 if ( getSize() > 0 ) {
 selectedObject = getElementAt( 0 );
 }
 }

 /**
 * Constructs a DefaultComboBoxModel object initialized with
 * a vector.
 *
 * @param v a Vector object ...
 */
 public DefaultComboBoxModel(Vector<E> v) {
 objects = v;

 if ( getSize() > 0 ) {
 selectedObject = getElementAt( 0 );
 }
 }

 // implements javax.swing.ComboBoxModel
 /**
 * Set the value of the selected item. The selected item may be null.
 *
 * @param anObject The combo box value or null for no selection.
 */
 public void setSelectedItem(Object anObject) {
 if ((selectedObject != null && !selectedObject.equals( anObject )) ||
 selectedObject == null && anObject != null) {
 selectedObject = anObject;
 fireContentsChanged(this, -1, -1);
 }
 }

 // implements javax.swing.ComboBoxModel
 public Object getSelectedItem() {
 return selectedObject;
 }

 // implements javax.swing.ListModel
 public int getSize() {
 return objects.size();
 }

 // implements javax.swing.ListModel
 public E getElementAt(int index) {
 if ( index >= 0 && index < objects.size() )
 return objects.elementAt(index);
 else
 return null;
 }

 /**
 * Returns the index-position of the specified object in the list.
 *
 * @param anObject
 * @return an int representing the index position, where 0 is
 * the first position
 */
 public int getIndexOf(Object anObject) {
 return objects.indexOf(anObject);
 }

 // implements javax.swing.MutableComboBoxModel
 public void addElement(E anObject) {
 objects.addElement(anObject);
 fireIntervalAdded(this,objects.size()-1, objects.size()-1);
 if ( objects.size() == 1 && selectedObject == null && anObject != null ) {
 setSelectedItem( anObject );
 }
 }

 // implements javax.swing.MutableComboBoxModel
 public void insertElementAt(E anObject,int index) {
 objects.insertElementAt(anObject,index);
 fireIntervalAdded(this, index, index);
 }

 // implements javax.swing.MutableComboBoxModel
 public void removeElementAt(int index) {
 if ( getElementAt( index ) == selectedObject ) {
 if ( index == 0 ) {
 setSelectedItem( getSize() == 1 ? null : getElementAt( index + 1 ) );
 }
 else {
 setSelectedItem( getElementAt( index - 1 ) );
 }
 }

 objects.removeElementAt(index);

 fireIntervalRemoved(this, index, index);
 }

 // implements javax.swing.MutableComboBoxModel
 public void removeElement(Object anObject) {
 int index = objects.indexOf(anObject);
 if ( index != -1 ) {
 removeElementAt(index);
 }
 }

 /**
 * Empties the list.
 */
 public void removeAllElements() {
 if ( objects.size() > 0 ) {
 int firstIndex = 0;
 int lastIndex = objects.size() - 1;
 objects.removeAllElements();
 selectedObject = null;
 fireIntervalRemoved(this, firstIndex, lastIndex);
 } else {
 selectedObject = null;
 }
 }
}