package mug13;

/**
 * An action that is performed in the world.  For convenience, subject,
 * verb, and object are all stored in lowercase.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of November 2004
 */
public class Action
{
// +--------+--------------------------------------------------
// | Fields |
// +--------+

	/**
	 * The name of the person who performs the action.
	 */
	String subject;

	/**
	 * The action performed.
	 */
	String verb;

	/**
	 * The object of the action.  Set to null if there is
	 * no object.
	 */
	String object;

// +--------------+--------------------------------------------
// | Constructors |
// +--------------+

	/**
	 * Build a new action with subject, verb, and object
	 */
	public Action(String _subject, String _verb, String _object)
	{
		// The next line calls the other constructor (the
		// no-object constructor) for uniformity.
		this(_subject,_verb);
		this.object = _object.toLowerCase();
	} // Action(String,String,String)

	/**
	 * Build a new action with subject and verb, but no object.
	 */
	public Action(String _subject, String _verb)
	{
		this.subject = _subject.toLowerCase();
		this.verb = _verb.toLowerCase();
		this.object = null;
	} // Action(String, String)

// +---------+-------------------------------------------------
// | Methods |
// +---------+

	/**
	 * Get the subject of this action.
	 */
	public String getSubject()
	{
		return this.subject;
	} // getSubject()

	/**
	 * Get the verb for this action.
	 */
	public String getVerb()
	{
		return this.verb;
	} // getVerb()

	/**
	 * Get the object of this action.  Returns null if there
	 * is no object.
	 */
	public String getObject()
	{
		return this.object;
	} // getObject()

} // class Action