startupcommand.java

java设计模式源码

package com.oozinoz.robotInterpreter2;

/*
 * Copyright (c) 2001, 2005. Steven J. Metsker.
 * 
 * Steve Metsker makes no representations or warranties about
 * the fitness of this software for any particular purpose, 
 * including the implied warranty of merchantability.
 *
 * Please use this software as you wish with the sole
 * restriction that you may not claim that you wrote it.
 */

import com.oozinoz.machine.Machine;

/**
*  This class represents a command to start up a machine
*  indicated by a provided term.
*/
public class StartUpCommand extends Command {
    protected Term term;

    /**
    *  Construct a command to shut down a machine indicated by
    *  the provided term.
    *  @param term a term to evaulate when this command executes;
    *  the machine it evaulates to will be shut down
   */
     public StartUpCommand(Term term) {
        this.term = term;
    }

    /**
    *  Evaluate this object's term to a machine and shut down
    *  that machine.
    */
    public void execute() {
        Machine m = term.eval();
        m.startup();
    }
}