defaultlistmodel.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 102 行

/* class DefaultListModel
 *
 * Copyright (C) 2001  R M Pitman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package charvax.swing;

import java.util.ArrayList;

/**
 * This class implements the Vector API. It actually delegates to an ArrayList.
 */
public class DefaultListModel
    extends AbstractListModel
    implements ListModel
{
    /** Default constructor
     */
    public DefaultListModel() {
	super();
    }

    /** Returns the value at the specified index.
     */
    public Object getElementAt(int index_) {
	return _list.get(index_);
    }

    /** Returns the length of the list.
     */
    public int getSize() {
	return _list.size();
    }

    /** Clear the contents of the list.
     */
    public void clear() {
	int size = _list.size();
	_list.clear();
	super.fireIntervalRemoved(this, 0, size);
    }

    /** Returns true if the specified element is in the list.
     */
    public boolean contains(Object elem_) {
	return _list.contains(elem_);
    }

    /** Inserts the specified object at the specified position in this list.
     */
    public void add(int index_, Object elem_) {
	_list.add(index_, elem_);
	super.fireIntervalAdded(this, index_, index_);
    }

    /** Add the specified object to the end of the list.
     */
    public void addElement(Object obj_) {
	_list.add(obj_);
	super.fireIntervalAdded(this, _list.size(), _list.size());
    }

    /** Deletes the component at the specified index.
     */
    public void removeElementAt(int index_) {
	_list.remove(index_);
	super.fireIntervalRemoved(this, index_, index_);
    }

    /** Removes all elements from this list and sets its size to zero.
     */
    public void removeAllElements() {
	int size = _list.size();
	_list.clear();
	super.fireIntervalRemoved(this, 0, size);
    }

    /** Returns the index of the first occurrence of the specified object.
     */
    public int indexOf(Object elem_) {
	return _list.indexOf(elem_);
    }

    // INSTANCE VARIABLES

    private ArrayList _list = new ArrayList();
}