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//: enumerated/PostOffice.java

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

// Modeling a post office.

import java.util.*;

import net.mindview.util.*;

import static net.mindview.util.Print.*;

class Mail {

// The NO's lower the probability of random selection:

enum GeneralDelivery {YES,NO1,NO2,NO3,NO4,NO5}

enum Scannability {UNSCANNABLE,YES1,YES2,YES3,YES4}

enum Readability {ILLEGIBLE,YES1,YES2,YES3,YES4}

enum Address {INCORRECT,OK1,OK2,OK3,OK4,OK5,OK6}

enum ReturnAddress {MISSING,OK1,OK2,OK3,OK4,OK5}

GeneralDelivery generalDelivery;

Scannability scannability;

Readability readability;

Address address;

ReturnAddress returnAddress;

static long counter = 0;

long id = counter++;

public String toString() { return "Mail " + id; }

public String details() {

return toString() +

", General Delivery: " + generalDelivery +

", Address Scanability: " + scannability +

", Address Readability: " + readability +

", Address Address: " + address +

", Return address: " + returnAddress;

}

// Generate test Mail:

public static Mail randomMail() {

Mail m = new Mail();

m.generalDelivery= Enums.random(GeneralDelivery.class);

m.scannability = Enums.random(Scannability.class);

m.readability = Enums.random(Readability.class);

m.address = Enums.random(Address.class);

m.returnAddress = Enums.random(ReturnAddress.class);

return m;

}

public static Iterable<Mail> generator(final int count) {

return new Iterable<Mail>() {

int n = count;

public Iterator<Mail> iterator() {

return new Iterator<Mail>() {

public boolean hasNext() { return n-- > 0; }

public Mail next() { return randomMail(); }

public void remove() { // Not implemented

throw new UnsupportedOperationException();

}

};

}

};

}

}

public class PostOffice {

enum MailHandler {

GENERAL_DELIVERY {

boolean handle(Mail m) {

switch(m.generalDelivery) {

case YES:

print("Using general delivery for " + m);

return true;

default: return false;

}

}

},

MACHINE_SCAN {

boolean handle(Mail m) {

switch(m.scannability) {

case UNSCANNABLE: return false;

default:

switch(m.address) {

case INCORRECT: return false;

default:

print("Delivering "+ m + " automatically");

return true;

}

}

}

},

VISUAL_INSPECTION {

boolean handle(Mail m) {

switch(m.readability) {

case ILLEGIBLE: return false;

default:

switch(m.address) {

case INCORRECT: return false;

default:

print("Delivering " + m + " normally");

return true;

}

}

}

},

RETURN_TO_SENDER {

boolean handle(Mail m) {

switch(m.returnAddress) {

case MISSING: return false;

default:

print("Returning " + m + " to sender");

return true;

}

}

};

abstract boolean handle(Mail m);

}

static void handle(Mail m) {

for(MailHandler handler : MailHandler.values())

if(handler.handle(m))

return;

print(m + " is a dead letter");

}

public static void main(String[] args) {

for(Mail mail : Mail.generator(10)) {

print(mail.details());

handle(mail);

print("*****");

}

}

} /* Output:

Mail 0, General Delivery: NO2, Address Scanability: UNSCANNABLE, Address Readability: YES3, Address Address: OK1, Return address: OK1

Delivering Mail 0 normally

*****

Mail 1, General Delivery: NO5, Address Scanability: YES3, Address Readability: ILLEGIBLE, Address Address: OK5, Return address: OK1

Delivering Mail 1 automatically

*****

Mail 2, General Delivery: YES, Address Scanability: YES3, Address Readability: YES1, Address Address: OK1, Return address: OK5

Using general delivery for Mail 2

*****

Mail 3, General Delivery: NO4, Address Scanability: YES3, Address Readability: YES1, Address Address: INCORRECT, Return address: OK4

Returning Mail 3 to sender

*****

Mail 4, General Delivery: NO4, Address Scanability: UNSCANNABLE, Address Readability: YES1, Address Address: INCORRECT, Return address: OK2

Returning Mail 4 to sender

*****

Mail 5, General Delivery: NO3, Address Scanability: YES1, Address Readability: ILLEGIBLE, Address Address: OK4, Return address: OK2

Delivering Mail 5 automatically

*****

Mail 6, General Delivery: YES, Address Scanability: YES4, Address Readability: ILLEGIBLE, Address Address: OK4, Return address: OK4

Using general delivery for Mail 6

*****

Mail 7, General Delivery: YES, Address Scanability: YES3, Address Readability: YES4, Address Address: OK2, Return address: MISSING

Using general delivery for Mail 7

*****

Mail 8, General Delivery: NO3, Address Scanability: YES1, Address Readability: YES3, Address Address: INCORRECT, Return address: MISSING

Mail 8 is a dead letter

*****

Mail 9, General Delivery: NO1, Address Scanability: UNSCANNABLE, Address Readability: YES2, Address Address: OK1, Return address: OK4

Delivering Mail 9 normally

*****

*///:~