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package org.scijava.convert;

import org.scijava.util.Types;

/**
 * Converts numbers to numbers, and throws IllegalArgumentException for null or
 * invalid input.
 *
 * @author Alison Walter
 */
public abstract class NumberToNumberConverter
	extends AbstractConverter
{

	@Override
	public  T convert(final Object src, final Class dest) {
		if (src == null || dest == null) throw new IllegalArgumentException(
			"Null input");
		if (!getInputType().isInstance(src)) {
			throw new IllegalArgumentException("Expected input of type " +
				getInputType().getSimpleName() + ", but got " +
				src.getClass().getSimpleName());
		}
		if (Types.box(dest) != getOutputType()) {
			throw new IllegalArgumentException(
				"Expected output class of " + getOutputType().getSimpleName() +
				", but got " + dest.getSimpleName());
		}
		return (T) convert((Number) src);
	}

	public abstract O convert(Number n);
}