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//: typeinfo/NullRobot.java

package typeinfo; /* Added by Eclipse.py */

// Using a dynamic proxy to create a Null Object.

import java.lang.reflect.*;

import java.util.*;

import net.mindview.util.*;

class NullRobotProxyHandler implements InvocationHandler {

private String nullName;

private Robot proxied = new NRobot();

NullRobotProxyHandler(Class<? extends Robot> type) {

nullName = type.getSimpleName() + " NullRobot";

}

private class NRobot implements Null, Robot {

public String name() { return nullName; }

public String model() { return nullName; }

public List<Operation> operations() {

return Collections.emptyList();

}

}

public Object

invoke(Object proxy, Method method, Object[] args)

throws Throwable {

return method.invoke(proxied, args);

}

}

public class NullRobot {

public static Robot

newNullRobot(Class<? extends Robot> type) {

return (Robot)Proxy.newProxyInstance(

NullRobot.class.getClassLoader(),

new Class[]{ Null.class, Robot.class },

new NullRobotProxyHandler(type));

}

public static void main(String[] args) {

Robot[] bots = {

new SnowRemovalRobot("SnowBee"),

newNullRobot(SnowRemovalRobot.class)

};

for(Robot bot : bots)

Robot.Test.test(bot);

}

} /* Output:

Robot name: SnowBee

Robot model: SnowBot Series 11

SnowBee can shovel snow

SnowBee shoveling snow

SnowBee can chip ice

SnowBee chipping ice

SnowBee can clear the roof

SnowBee clearing roof

[Null Robot]

Robot name: SnowRemovalRobot NullRobot

Robot model: SnowRemovalRobot NullRobot

*///:~