An example external adapter (for cases where IAdaptable won't suffice)

Adapter.java

public interface Adapter {
	/**
	 * Check if this adapter can adapt from source class to target one
	 * @param from class to adapt
	 * @param to class to create
	 * @return isn't it obvious ? true if this adapter can transform an object of "from" class into an object of "to" class
	 */
	public boolean canAdapt(Class<?> from, Class<?> to);
	
	/**
	 * Adapts an object of input class into an object of output class
	 * @param input input object to adapt
	 * @param outputClass output class to produce. This is given due to some restrictions of Java generics
	 * @return an object of output class that corresponds to input object
	 * @throws UnableToAdapt if adaptation failed for any reason
	 */
	public <Input, Output> Output getAdapter(Input input, Class<Output> outputClass) throws UnableToAdapt;
}