Generates a label for the specified item. The label is typically a formatted version of the data value, but any text can be used.

Parameters:

	dataset	the dataset (null not permitted).
	series	the series index (zero-based).
	item	the item index (zero-based).

Returns:

The label (possibly null).

Implemented in org::jfree::chart::labels::BubbleXYItemLabelGenerator, org::jfree::chart::labels::HighLowItemLabelGenerator, org::jfree::chart::labels::IntervalXYItemLabelGenerator, org::jfree::chart::labels::StandardXYItemLabelGenerator, and org::jfree::chart::labels::SymbolicXYItemLabelGenerator.

Referenced by org::jfree::chart::renderer::xy::YIntervalRenderer::drawAdditionalItemLabel(), org::jfree::chart::renderer::xy::XYBarRenderer::drawItemLabel(), and org::jfree::chart::renderer::xy::AbstractXYItemRenderer::drawItemLabel().