/**
 * A simple component for getting familiar with component writing.
 * The component contains a "greetings" port which responds with "Hello World"
 * when receiving greetings "hi".
 */
public class HelloWorld extends drcl.comp.Component
{
	drcl.comp.Port greetingsPort;

	public HelloWorld()
	{
		super("hello");
		greetingsPort = addPort("greetings");
	}

	/**
	 * The method is invoked when data is received at one of its ports.
	 * <code>inPort_</code> should be the greetings port created in the constructor.  
	 */
	public void process(Object data_, drcl.comp.Port inPort_)
	{
		if (inPort_ == greetingsPort && ((String)data_).toLowerCase().startsWith("hi")) 
			inPort_.doSending("Hello World!\n");
	}
}