package cruzgtug.example.guice;

import com.google.inject.Inject;
import com.google.inject.name.Named;

/**
 * This is an example implementation, which provides an API for saying 
 * hello.
 * 
 * @author esmiley
 *
 */

public class HelloImpl implements Hello {
	private String hello;
	/**
	 * This constructor has an @Inject annotation so it will get injected by
	 * Guice.
	 * 
	 * But where does its hello parameter come from?
	 * Well, the String parameter has an @Named annotation, so a Provider will
	 * furnish a matching string.   
	 * 
	 * That gives the injection for its modules the
	 * ability to distinguish between different instances of the same object
	 * (String) used for different purposes.
	 * @param hello
	 */
	@Inject HelloImpl(@Named("HelloString") String hello){
		this.hello = hello;
	}

	/**
	 * The implementation logic, such as it is.
	 */
	public void hello() {
		System.out.println(hello);
	}

}