/*

 * Copyright 1997-2004 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package javax.swing;

import java.util.Vector;

import java.util.Enumeration;

import javax.swing.event.*;

/**

 * This class loosely implements the <code>java.util.Vector</code>

 * API, in that it implements the 1.1.x version of

 * <code>java.util.Vector</code>, has no collection class support,

 * and notifies the <code>ListDataListener</code>s when changes occur.

 * Presently it delegates to a <code>Vector</code>,

 * in a future release it will be a real Collection implementation.

 * <p>

 * <strong>Warning:</strong>

 * Serialized objects of this class will not be compatible with

 * future Swing releases. The current serialization support is

 * appropriate for short term storage or RMI between applications running

 * the same version of Swing.  As of 1.4, support for long term storage

 * of all JavaBeans<sup><font size="-2">TM</font></sup>

 * has been added to the <code>java.beans</code> package.

 * Please see {@link java.beans.XMLEncoder}.

 *

 * @author Hans Muller

 */

public class DefaultListModel extends AbstractListModel

{

    private Vector delegate = new Vector();

    /**

     * Returns the number of components in this list.

     * <p>

     * This method is identical to <code>size</code>, which implements the

     * <code>List</code> interface defined in the 1.2 Collections framework.

     * This method exists in conjunction with <code>setSize</code> so that

     * <code>size</code> is identifiable as a JavaBean property.

     *

     * @return  the number of components in this list

     * @see #size()

     */

    public int getSize() {

        return delegate.size();

    }

    /**

     * Returns the component at the specified index.

     * <blockquote>

     * <b>Note:</b> Although this method is not deprecated, the preferred

     *    method to use is <code>get(int)</code>, which implements the

     *    <code>List</code> interface defined in the 1.2 Collections framework.

     * </blockquote>

     * @param      index   an index into this list

     * @return     the component at the specified index

     * @exception  ArrayIndexOutOfBoundsException  if the <code>index</code>

     *             is negative or greater than the current size of this

     *             list

     * @see #get(int)

     */

    public Object getElementAt(int index) {

        return delegate.elementAt(index);

    }

    /**

     * Copies the components of this list into the specified array.

     * The array must be big enough to hold all the objects in this list,

     * else an <code>IndexOutOfBoundsException</code> is thrown.

     *

     * @param   anArray   the array into which the components get copied

     * @see Vector#copyInto(Object[])

     */

    public void copyInto(Object anArray[]) {

        delegate.copyInto(anArray);

    }

    /**

     * Trims the capacity of this list to be the list's current size.

     *

     * @see Vector#trimToSize()

     */

    public void trimToSize() {

        delegate.trimToSize();

    }

    /**

     * Increases the capacity of this list, if necessary, to ensure

     * that it can hold at least the number of components specified by

     * the minimum capacity argument.

     *

     * @param   minCapacity   the desired minimum capacity

     * @see Vector#ensureCapacity(int)

     */

    public void ensureCapacity(int minCapacity) {

        delegate.ensureCapacity(minCapacity);

    }

    /**

     * Sets the size of this list.

     *

     * @param   newSize   the new size of this list

     * @see Vector#setSize(int)

     */

    public void setSize(int newSize) {

        int oldSize = delegate.size();

        delegate.setSize(newSize);

        if (oldSize > newSize) {

            fireIntervalRemoved(this, newSize, oldSize-1);

        }

        else if (oldSize < newSize) {

            fireIntervalAdded(this, oldSize, newSize-1);

        }

    }

    /**

     * Returns the current capacity of this list.

     *

     * @return  the current capacity

     * @see Vector#capacity()

     */

    public int capacity() {

        return delegate.capacity();

    }

    /**

     * Returns the number of components in this list.

     *

     * @return  the number of components in this list

     * @see Vector#size()

     */

    public int size() {

        return delegate.size();

    }

    /**

     * Tests whether this list has any components.

     *

     * @return  <code>true</code> if and only if this list has

     *          no components, that is, its size is zero;

     *          <code>false</code> otherwise

     * @see Vector#isEmpty()

     */

    public boolean isEmpty() {

        return delegate.isEmpty();

    }

    /**

     * Returns an enumeration of the components of this list.

     *

     * @return  an enumeration of the components of this list

     * @see Vector#elements()

     */

    public Enumeration<?> elements() {

        return delegate.elements();

    }

    /**

     * Tests whether the specified object is a component in this list.

     *

     * @param   elem   an object

     * @return  <code>true</code> if the specified object

     *          is the same as a component in this list

     * @see Vector#contains(Object)

     */

    public boolean contains(Object elem) {

        return delegate.contains(elem);

    }

    /**

     * Searches for the first occurrence of <code>elem</code>.

     *

     * @param   elem   an object

     * @return  the index of the first occurrence of the argument in this

     *          list; returns <code>-1</code> if the object is not found

     * @see Vector#indexOf(Object)

     */

    public int indexOf(Object elem) {

        return delegate.indexOf(elem);

    }

    /**

     * Searches for the first occurrence of <code>elem</code>, beginning

     * the search at <code>index</code>.

     *

     * @param   elem    an desired component

     * @param   index   the index from which to begin searching

     * @return  the index where the first occurrence of <code>elem</code>

     *          is found after <code>index</code>; returns <code>-1</code>

     *          if the <code>elem</code> is not found in the list

     * @see Vector#indexOf(Object,int)

     */

     public int indexOf(Object elem, int index) {

        return delegate.indexOf(elem, index);

    }

    /**

     * Returns the index of the last occurrence of <code>elem</code>.

     *

     * @param   elem   the desired component

     * @return  the index of the last occurrence of <code>elem</code>

     *          in the list; returns <code>-1</code> if the object is not found

     * @see Vector#lastIndexOf(Object)

     */

    public int lastIndexOf(Object elem) {

        return delegate.lastIndexOf(elem);

    }

    /**

     * Searches backwards for <code>elem</code>, starting from the

     * specified index, and returns an index to it.

     *

     * @param  elem    the desired component

     * @param  index   the index to start searching from

     * @return the index of the last occurrence of the <code>elem</code>

     *          in this list at position less than <code>index</code>;

     *          returns <code>-1</code> if the object is not found

     * @see Vector#lastIndexOf(Object,int)

     */

    public int lastIndexOf(Object elem, int index) {

        return delegate.lastIndexOf(elem, index);

    }

    /**

     * Returns the component at the specified index.

     * Throws an <code>ArrayIndexOutOfBoundsException</code> if the index

     * is negative or not less than the size of the list.

     * <blockquote>

     * <b>Note:</b> Although this method is not deprecated, the preferred

     *    method to use is <code>get(int)</code>, which implements the

     *    <code>List</code> interface defined in the 1.2 Collections framework.

     * </blockquote>

     *

     * @param      index   an index into this list

     * @return     the component at the specified index

     * @see #get(int)

     * @see Vector#elementAt(int)

     */

    public Object elementAt(int index) {

        return delegate.elementAt(index);

    }

    /**

     * Returns the first component of this list.

     * Throws a <code>NoSuchElementException</code> if this

     * vector has no components.

     * @return     the first component of this list

     * @see Vector#firstElement()

     */

    public Object firstElement() {

        return delegate.firstElement();

    }

    /**

     * Returns the last component of the list.

     * Throws a <code>NoSuchElementException</code> if this vector

     * has no components.

     *

     * @return  the last component of the list

     * @see Vector#lastElement()

     */

    public Object lastElement() {

        return delegate.lastElement();

    }

    /**

     * Sets the component at the specified <code>index</code> of this

     * list to be the specified object. The previous component at that

     * position is discarded.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code> if the index

     * is invalid.

     * <blockquote>

     * <b>Note:</b> Although this method is not deprecated, the preferred

     *    method to use is <code>set(int,Object)</code>, which implements the

     *    <code>List</code> interface defined in the 1.2 Collections framework.

     * </blockquote>

     *

     * @param      obj     what the component is to be set to

     * @param      index   the specified index

     * @see #set(int,Object)

     * @see Vector#setElementAt(Object,int)

     */

    public void setElementAt(Object obj, int index) {

        delegate.setElementAt(obj, index);

        fireContentsChanged(this, index, index);

    }

    /**

     * Deletes the component at the specified index.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code> if the index

     * is invalid.

     * <blockquote>

     * <b>Note:</b> Although this method is not deprecated, the preferred

     *    method to use is <code>remove(int)</code>, which implements the

     *    <code>List</code> interface defined in the 1.2 Collections framework.

     * </blockquote>

     *

     * @param      index   the index of the object to remove

     * @see #remove(int)

     * @see Vector#removeElementAt(int)

     */

    public void removeElementAt(int index) {

        delegate.removeElementAt(index);

        fireIntervalRemoved(this, index, index);

    }

    /**

     * Inserts the specified object as a component in this list at the

     * specified <code>index</code>.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code> if the index

     * is invalid.

     * <blockquote>

     * <b>Note:</b> Although this method is not deprecated, the preferred

     *    method to use is <code>add(int,Object)</code>, which implements the

     *    <code>List</code> interface defined in the 1.2 Collections framework.

     * </blockquote>

     *

     * @param      obj     the component to insert

     * @param      index   where to insert the new component

     * @exception  ArrayIndexOutOfBoundsException  if the index was invalid

     * @see #add(int,Object)

     * @see Vector#insertElementAt(Object,int)

     */

    public void insertElementAt(Object obj, int index) {

        delegate.insertElementAt(obj, index);

        fireIntervalAdded(this, index, index);

    }

    /**

     * Adds the specified component to the end of this list.

     *

     * @param   obj   the component to be added

     * @see Vector#addElement(Object)

     */

    public void addElement(Object obj) {

        int index = delegate.size();

        delegate.addElement(obj);

        fireIntervalAdded(this, index, index);

    }

    /**

     * Removes the first (lowest-indexed) occurrence of the argument

     * from this list.

     *

     * @param   obj   the component to be removed

     * @return  <code>true</code> if the argument was a component of this

     *          list; <code>false</code> otherwise

     * @see Vector#removeElement(Object)

     */

    public boolean removeElement(Object obj) {

        int index = indexOf(obj);

        boolean rv = delegate.removeElement(obj);

        if (index >= 0) {

            fireIntervalRemoved(this, index, index);

        }

        return rv;

    }

    /**

     * Removes all components from this list and sets its size to zero.

     * <blockquote>

     * <b>Note:</b> Although this method is not deprecated, the preferred

     *    method to use is <code>clear</code>, which implements the

     *    <code>List</code> interface defined in the 1.2 Collections framework.

     * </blockquote>

     *

     * @see #clear()

     * @see Vector#removeAllElements()

     */

    public void removeAllElements() {

        int index1 = delegate.size()-1;

        delegate.removeAllElements();

        if (index1 >= 0) {

            fireIntervalRemoved(this, 0, index1);

        }

    }

    /**

     * Returns a string that displays and identifies this

     * object's properties.

     *

     * @return a String representation of this object

     */

   public String toString() {

        return delegate.toString();

    }

    /* The remaining methods are included for compatibility with the

     * Java 2 platform Vector class.

     */

    /**

     * Returns an array containing all of the elements in this list in the

     * correct order.

     *

     * @return an array containing the elements of the list

     * @see Vector#toArray()

     */

    public Object[] toArray() {

        Object[] rv = new Object[delegate.size()];

        delegate.copyInto(rv);

        return rv;

    }

    /**

     * Returns the element at the specified position in this list.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code>

     * if the index is out of range

     * (<code>index &lt; 0 || index &gt;= size()</code>).

     *

     * @param index index of element to return

     */

    public Object get(int index) {

        return delegate.elementAt(index);

    }

    /**

     * Replaces the element at the specified position in this list with the

     * specified element.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code>

     * if the index is out of range

     * (<code>index &lt; 0 || index &gt;= size()</code>).

     *

     * @param index index of element to replace

     * @param element element to be stored at the specified position

     * @return the element previously at the specified position

     */

    public Object set(int index, Object element) {

        Object rv = delegate.elementAt(index);

        delegate.setElementAt(element, index);

        fireContentsChanged(this, index, index);

        return rv;

    }

    /**

     * Inserts the specified element at the specified position in this list.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code> if the

     * index is out of range

     * (<code>index &lt; 0 || index &gt; size()</code>).

     *

     * @param index index at which the specified element is to be inserted

     * @param element element to be inserted

     */

    public void add(int index, Object element) {

        delegate.insertElementAt(element, index);

        fireIntervalAdded(this, index, index);

    }

    /**

     * Removes the element at the specified position in this list.

     * Returns the element that was removed from the list.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code>

     * if the index is out of range

     * (<code>index &lt; 0 || index &gt;= size()</code>).

     *

     * @param index the index of the element to removed

     */

    public Object remove(int index) {

        Object rv = delegate.elementAt(index);

        delegate.removeElementAt(index);

        fireIntervalRemoved(this, index, index);

        return rv;

    }

    /**

     * Removes all of the elements from this list.  The list will

     * be empty after this call returns (unless it throws an exception).

     */

    public void clear() {

        int index1 = delegate.size()-1;

        delegate.removeAllElements();

        if (index1 >= 0) {

            fireIntervalRemoved(this, 0, index1);

        }

    }

    /**

     * Deletes the components at the specified range of indexes.

     * The removal is inclusive, so specifying a range of (1,5)

     * removes the component at index 1 and the component at index 5,

     * as well as all components in between.

     * <p>

     * Throws an <code>ArrayIndexOutOfBoundsException</code>

     * if the index was invalid.

     * Throws an <code>IllegalArgumentException</code> if

     * <code>fromIndex &gt; toIndex</code>.

     *

     * @param      fromIndex the index of the lower end of the range

     * @param      toIndex   the index of the upper end of the range

     * @see        #remove(int)

     */

    public void removeRange(int fromIndex, int toIndex) {

        if (fromIndex > toIndex) {

            throw new IllegalArgumentException("fromIndex must be <= toIndex");