public final class ChartChangeEventType implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 5481917022435735602L;
    
    /** GENERAL. */
    public static final ChartChangeEventType GENERAL 
            = new ChartChangeEventType("ChartChangeEventType.GENERAL");

    /** NEW_DATASET. */
    public static final ChartChangeEventType NEW_DATASET 
            = new ChartChangeEventType("ChartChangeEventType.NEW_DATASET");

    /** DATASET_UPDATED. */
    public static final ChartChangeEventType DATASET_UPDATED
            = new ChartChangeEventType("ChartChangeEventType.DATASET_UPDATED");

    /** The name. */
    private String name;

    /**
     * Private constructor.
     *
     * @param name  the name.
     */
    private ChartChangeEventType(String name) {
        this.name = name;
    }

    /**
     * Returns a string representing the object.
     *
     * @return The string.
     */
    public String toString() {
        return this.name;
    }

    /**
     * Returns <code>true</code> if this object is equal to the specified 
     * object, and <code>false</code> otherwise.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof ChartChangeEventType)) {
            return false;
        }
        ChartChangeEventType that = (ChartChangeEventType) obj;
        if (!this.name.equals(that.toString())) {
            return false;
        }
        return true;
    }
    
    /**
     * Returns a hash code value for the object.
     *
     * @return The hashcode
     */
    public int hashCode() {
        return this.name.hashCode();
    }

    /**
     * Ensures that serialization returns the unique instances.
     * 
     * @return The object.
     * 
     * @throws ObjectStreamException if there is a problem.
     */
    private Object readResolve() throws ObjectStreamException {
        if (this.equals(ChartChangeEventType.GENERAL)) {
            return ChartChangeEventType.GENERAL;
        }
        else if (this.equals(ChartChangeEventType.NEW_DATASET)) {
            return ChartChangeEventType.NEW_DATASET;
        }
        else if (this.equals(ChartChangeEventType.DATASET_UPDATED)) {
            return ChartChangeEventType.DATASET_UPDATED;
        }
        return null;