shapelist.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 178 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.]
 * 
 * --------------
 * ShapeList.java
 * --------------
 * (C) Copyright 2003, 2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: ShapeList.java,v 1.3 2005/06/01 14:12:31 taqua Exp $
 *
 * Changes
 * -------
 * 13-Aug-2003 : Version 1 (DG);
 * 
 */

package org.jfree.util;

import java.awt.Shape;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.jfree.io.SerialUtilities;


/**
 * A table of {@link Shape} objects.
 *
 * @author David Gilbert
 */
public class ShapeList extends AbstractObjectList {

    /**
     * Creates a new list.
     */
    public ShapeList() {
        super();
    }

    /**
     * Returns a {@link Shape} object from the list.
     *
     * @param index the index (zero-based).
     *
     * @return The object.
     */
    public Shape getShape(final int index) {
        return (Shape) get(index);
    }

    /**
     * Sets the {@link Shape} for an item in the list.  The list is expanded if necessary.
     *
     * @param index  the index (zero-based).
     * @param shape  the {@link Shape}.
     */
    public void setShape(final int index, final Shape shape) {
        set(index, shape);
    }

    /**
     * Returns an independent copy of the list.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException if an item in the list does not support cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
    
    /**
     * Tests the list for equality with another object (typically also a list).
     *
     * @param o  the other object.
     *
     * @return A boolean.
     */
    public boolean equals(final Object o) {

        if (o == null) {
            return false;
        }
        
        if (o == this) {
            return true;
        }
        
        if (o instanceof ShapeList) {
            return super.equals(o);
        }

        return false;

    }
    
    /**
     * Returns a hash code value for the object.
     *
     * @return the hashcode
     */
    public int hashCode() {
        return super.hashCode();
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(final ObjectOutputStream stream) throws IOException {

        stream.defaultWriteObject();
        final int count = size();
        stream.writeInt(count);
        for (int i = 0; i < count; i++) {
            final Shape shape = getShape(i);
            if (shape != null) {
                stream.writeInt(i);
                SerialUtilities.writeShape(shape, stream);
            }
            else {
                stream.writeInt(-1);
            }
        }

    }
    
    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(final ObjectInputStream stream) throws IOException, ClassNotFoundException {

        stream.defaultReadObject();
        final int count = stream.readInt();
        for (int i = 0; i < count; i++) {
            final int index = stream.readInt();
            if (index != -1) {
                setShape(index, SerialUtilities.readShape(stream));
            }
        }
        
    }

}