Implementation of the logarithmic axis (step 1)

LogarithmicAxis.java

import javafx.scene.chart.ValueAxis;

/**
 * A logarithmic axis implementation for JavaFX 2 charts<br>
 * <br>
 * 
 * @author Kevin Senechal
 * 
 */
public class LogarithmicAxis extends ValueAxis<Number> {

	private final DoubleProperty logUpperBound = new SimpleDoubleProperty();
	private final DoubleProperty logLowerBound = new SimpleDoubleProperty();

	public LogarithmicAxis() {
		super(1, 100);
		bindLogBoundsToDefaultBounds();
	}

	public LogarithmicAxis(double lowerBound, double upperBound) {
		super(lowerBound, upperBound);
		try {
			validateBounds(lowerBound, upperBound);
			bindLogBoundsToDefaultBounds();
		} catch (IllegalLogarithmicRangeException e) {
			e.printStackTrace();
		}
	}

	 /**
	 * Bind our logarithmic bounds with the super class bounds, consider the base 10 logarithmic scale.
	 */
	private void bindLogBoundsToDefaultBounds() {
		logLowerBound.bind(new DoubleBinding() {

			{
				super.bind(lowerBoundProperty());
			}

			@Override
			protected double computeValue() {
				return Math.log10(lowerBoundProperty().get());
			}
		});
		logUpperBound.bind(new DoubleBinding() {

			{
				super.bind(upperBoundProperty());
			}

			@Override
			protected double computeValue() {
				return Math.log10(upperBoundProperty().get());
			}
		});
	}

	/**
	 * Validate the bounds by throwing an exception if the values are not conform to the mathematics log interval:
	 * ]0,Double.MAX_VALUE]
	 * 
	 * @param lowerBound
	 * @param upperBound
	 * @throws IllegalLogarithmicRangeException
	 */
	private void validateBounds(double lowerBound, double upperBound) throws IllegalLogarithmicRangeException {
		if (lowerBound < 0 || upperBound < 0 || lowerBound > upperBound) {
			throw new IllegalLogarithmicRangeException(
					"The logarithmic range should be include to ]0,Double.MAX_VALUE] and the lowerBound should be less than the upperBound");
		}
	}

}