/* * Copyright (c) 1997, 2004, Oracle and/or its affiliates. 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.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.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}. * * @param <E> the type of the elements of this model * * @author Hans Muller */public class DefaultListModel<E> extends AbstractListModel<E>{    private Vector<E> delegate = new Vector<E>();     /**     * 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 E 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<E> 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 E 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 E 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 E lastElement() {        return delegate.lastElement();    }     /**     * Sets the component at the specified <code>index</code> of this     * list to be the specified element. 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      element 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(E element, int index) {        delegate.setElementAt(element, 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 element 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      element 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(E element, int index) {        delegate.insertElementAt(element, index);        fireIntervalAdded(this, index, index);    }     /**     * Adds the specified component to the end of this list.     *     * @param   element   the component to be added     * @see Vector#addElement(Object)     */    public void addElement(E element) {        int index = delegate.size();        delegate.addElement(element);        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 E 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 E set(int index, E element) {        E 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, E 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     * @return the element previously at the specified position     */    public E remove(int index) {        E rv = delegate.elementAt(index);        delegate.removeElementAt(index);        fireIntervalRemoved(this, index, index);        return rv;    }

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