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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D API, it supports a wide range of chart types including bar charts, pie charts, line charts, XY-plots, time series plots, Sankey charts and more.

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-present, by David Gilbert 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * -----------------
 * DatasetGroup.java
 * -----------------
 * (C) Copyright 2002-present, by David Gilbert.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   Tracy Hiltbrand (equals/hashCode comply with EqualsVerifier);
 *
 */

package org.jfree.data.general;

import java.io.Serializable;
import java.util.Objects;
import org.jfree.chart.util.Args;

/**
 * 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) {
        Args.nullNotPermitted(id, "id");
        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.
     */
    @Override
    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.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof DatasetGroup)) {
            return false;
        }
        DatasetGroup that = (DatasetGroup) obj;
        if (!Objects.equals(this.id, that.id)) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 41 * hash + Objects.hashCode(this.id);
        return hash;
    }

}