Bug 202254 Exception is thrown when category values are null and type of X axis is set to DateTime
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/data/util/DataAdapterFactory.java
* @return whether this factory is applicable for the type of the object.
	 * @generated
	 */
	public boolean isFactoryForType( Object object )
	{
		if ( object == modelPackage )
		{
			return true;
		}
		if ( object instanceof EObject )
		{
			return ( (EObject) object ).eClass( ).getEPackage( ) == modelPackage;
		}
		return false;
	}
	/**
	 * The switch the delegates to the <code>createXXX</code> methods.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	protected DataSwitch modelSwitch = new DataSwitch( ) {
		public Object caseAction( Action object )
		{
			return createActionAdapter( );
		}
		public Object caseBaseSampleData( BaseSampleData object )
		{
			return createBaseSampleDataAdapter( );
		}
		public Object caseBubbleDataSet( BubbleDataSet object )