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 module com {  module sun {  module star {  module chart {


/** manages the data of the chart.

    @see XChartDocument
 */
published interface XChartData: com::sun::star::uno::XInterface
{

    /** allows a component supporting the
        XChartDataChangeEventListener interface to
        register as listener.  The component will be notified with a
        ChartDataChangeEvent every time the chart's data
        changes.</p>

        @param aListener
            the component that is to be added as listener

        @see XChartDataChangeEventListener
        @see ChartDataChangeEvent
     */
    void addChartDataChangeEventListener( [in] com::sun::star::chart::XChartDataChangeEventListener aListener );


    /** removes a previously registered listener.

        @param aListener
            the component that is to be removed
     */
    void removeChartDataChangeEventListener( [in] com::sun::star::chart::XChartDataChangeEventListener aListener );


    /** @returns
            the value which is to be used as an indicator for a
            missing value in the data.

        <p>In IEEE arithmetic format it is one of the NaN values, so
        there are no conflicts with existing numeric values.</p>
     */
    double getNotANumber();


    /** checks whether the value given is equal to the indicator value
        for a missing value.

        <p>In IEEE arithmetic format it is one of the NaN values, so
        there are no conflicts with existing numeric values.</p>

        <p>Always use this method to check, if a value is <em>not a
        number</em>.  If you compare the value returned by
        XChartData::getNotANumber() to another double
        value using the = operator, you may not get the desired
        result!</p>

        @returns
            `TRUE` if the number given is interpreted by the chart as
            a missing value.

        @param nNumber
            the number that you want to check for validity.
     */
    boolean isNotANumber( [in] double nNumber );

};


}; }; }; };

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