ifaction.java

PIY(Program It Yourself)是一个基于Java的应用程序开发环境

package piy.action;

import piy.*;
import java.io.Serializable;

/**
* Special action (required by PIY) to allow condition branches in an action list.
* @author David Vivash
* @version 1.0, 17/03/01
*/
public class IfAction implements PIYAction, Serializable {
	private ActionList trueList;
	private ActionList falseList;

	private BooleanComparable ex = null;

	public IfAction() {
		trueList = new ActionList();
		falseList = new ActionList();
	}

	public BooleanComparable getExpression() { return ex; }
	public void setExpression(BooleanComparable val) { ex = val; }

	public Object execute() {
		if (ex == null) return null;
				
		if (ex.evaluate()) trueList.execute(); else falseList.execute();

		return null;
	}

	public ActionList getTrueList() { return trueList; }

	public ActionList getFalseList() { return falseList; }

	public Class getReturnType() { return null; }

}