jfreechart example source code file (DatasetGroup.java)

This example jfreechart source code file (DatasetGroup.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - jfreechart tags/keywords

cloneable, clonenotsupportedexception, clonenotsupportedexception, datasetgroup, datasetgroup, illegalargumentexception, io, noid, null, object, object, serializable, string, string

The jfreechart DatasetGroup.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -----------------
 * DatasetGroup.java
 * -----------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 07-Oct-2002 : Version 1 (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 20-Aug-2003 : Implemented Cloneable (DG);
 *
 */

package org.jfree.data.general;

import java.io.Serializable;

/**
 * A class that is used to group datasets (currently not used for any specific
 * purpose).
 */
public class DatasetGroup implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -3640642179674185688L;

    /** The group id. */
    private String id;

    /**
     * Constructs a new group.
     */
    public DatasetGroup() {
        super();
        this.id = "NOID";
    }

    /**
     * Creates a new group with the specified id.
     *
     * @param id  the identification for the group.
     */
    public DatasetGroup(String id) {
        if (id == null) {
            throw new IllegalArgumentException("Null 'id' argument.");
        }
        this.id = id;
    }

    /**
     * Returns the identification string for this group.
     *
     * @return The identification string.
     */
    public String getID() {
        return this.id;
    }

    /**
     * Clones the group.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException not by this class.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    /**
     * Tests this instance for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof DatasetGroup)) {
            return false;
        }
        DatasetGroup that = (DatasetGroup) obj;
        if (!this.id.equals(that.id)) {
            return false;
        }
        return true;
    }

}