objectlist.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 109 行

/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * ---------------
 * ObjectList.java
 * ---------------
 * (C)opyright 2003, 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: ObjectList.java,v 1.4 2005/06/01 14:12:30 taqua Exp $
 *
 * Changes
 * -------
 * 17-Jul-2003 : Version 1 (DG);
 * 13-Aug-2003 : Refactored to extend AbstractObjectList (DG);
 * 21-Oct-2004 : removed duplicate interface declarations and empty methods.
 * 22-Oct-2004 : Restored removed methods - see note in code (DG);
 * 
 */
 
package org.jfree.util;


/**
 * A list of objects that can grow as required.
 * <p>
 * When cloning, the objects in the list are NOT cloned, only the references. 
 *
 * @author Thomas Morgner
 */
public class ObjectList extends AbstractObjectList {
    
    /**
     * Default constructor.
     */
    public ObjectList() {
    }
    
    /**
     * Creates a new list.
     * 
     * @param initialCapacity  the initial capacity.
     */
    public ObjectList(final int initialCapacity) {
        super(initialCapacity);
    }
    
    // NOTE:  the methods below look redundant, but their purpose is to provide public
    // access to the the get(), set() and indexOf() methods defined in the 
    // AbstractObjectList class, for this class only.  For other classes 
    // (e.g. PaintList, ShapeList etc) we don't want the Object versions of these 
    // methods to be visible in the public API.
    
    /** 	 
     * Returns the object at the specified index, if there is one, or <code>null</code>. 	 
     * 	 
     * @param index  the object index. 	 
     * 	 
     * @return The object or <code>null</code>. 	 
     */ 	 
    public Object get(final int index) { 	 
        return super.get(index); 	 
    } 	 
  	 
    /** 	 
     * Sets an object reference (overwriting any existing object). 	 
     * 	 
     * @param index  the object index. 	 
     * @param object  the object (<code>null</code> permitted). 	 
     */ 	 
    public void set(final int index, final Object object) { 	 
        super.set(index, object); 	 
    } 	 
  	 
    /** 	 
     * Returns the index of the specified object, or -1 if the object is not in the list. 	 
     * 	 
     * @param object  the object. 	 
     * 	 
     * @return The index or -1. 	 
     */ 	 
    public int indexOf(final Object object) { 	 
        return super.indexOf(object); 	 
    } 	 
  	 
}