Chapter 15 Exercise 11

[clouded]

I think the point of the exercise is to prove ownership of the object(s), this is in contrast to Chapter 15 Exercise 6

Here's what I did on this one:

Code: (Objective-C)

//  Chapter 15 Exercise 11
// When the addCard: method is used to add an address card to the address book,
// who owns that address card? Can any of the information on that card be later
// changed that would affect the card stored in the address book? Can you think
// of a safer way to implement the addCard: method?

//  main.m

#import <Foundation/Foundation.h>
#import "AddressCard.h"
#import "AddressBook.h"

int main (int argc, char * argv[])
{
    @autoreleasepool {
        
        NSString *aName = @"Julia Kochan";
        NSString *aEmail = @"jewls337@axlc.com";
        NSString *bName = @"Tony Iannino";
        NSString *bEmail = @"tony.iannino@techfitness.com"; 
        NSString *cName = @"Stephen Kochan";
        NSString *cEmail = @"steve@classroomM.com";
        NSString *dName = @"Jamie Baker";
        NSString *dEmail = @"jbaker@classroomM.com";
        NSString *eName = @"Ella Smith";
        NSString *eEmail = @"ella.smith@csmithent.com";
        NSString *eAddress = @"123 Main Street";
        NSString *eCity = @"Anywhere";
        NSString *eZip = @"12345";
        NSString *eCountry = @"USA";
        NSString *ePhone = @"(212) 555-1212";
        
        AddressCard *card1 = [[AddressCard alloc] init];
        AddressCard *card2 = [[AddressCard alloc] init];
        AddressCard *card3 = [[AddressCard alloc] init];
        AddressCard *card4 = [[AddressCard alloc] init];
        AddressCard *card5 = [[AddressCard alloc] init];
        
        AddressBook *myBook = [[AddressBook alloc] initWithName: @"Linda’s Address Book"];
        
        // First set up four address cards
        [card1 setName: aName andEmail: aEmail];
        [card2 setName: bName andEmail: bEmail];
        [card3 setName: cName andEmail: cEmail];
        [card4 setName: dName andEmail: dEmail];
        [card5 setName: eName andEmail: eEmail andAddress: eAddress 
               andCity: eCity andZip: eZip andCountry: eCountry andPhone: ePhone];
        
        // Add some cards to the address book
        [myBook addCard2: card1];
        [myBook addCard2: card2];
        [myBook addCard2: card3];
        [myBook addCard2: card4];
        [myBook addCard2: card5];
        
        // List the book
        [myBook list];
        
        //change card1
        NSLog(@"Julia Kochan card changed from card1\ncard1 info:");
        [card1 setName: @"Card1 test" andEmail: @"test" andAddress: @"test" andCity: @"test" andZip: @"test" andCountry: @"test" andPhone: @"test"];
        [card1 printAll];
        
        // List the book again to verify Julia wasn't changed in myBook
        [myBook list];
        
        // Remove steve from myBook
        NSLog (@"remove: steve");
        if ([myBook removeName: @"steve"])
            NSLog (@"remove successful");
        else
            NSLog (@"remove unsuccessful");
        
        // List the book to verify Stephen was removed from myBook
        [myBook list];
        
        // Display card3 to verify Stephen was not deleted by removeName: method
        NSLog(@"card3 info:");
        [card3 printAll];
    }
    return 0;
}

Code: (Objective-C)

//  AddressBook.h

#import <Foundation/Foundation.h>
#import "AddressCard.h"

@interface AddressBook: NSObject

@property (nonatomic, copy) NSString *bookName;
@property (nonatomic, strong) NSMutableArray *book;
-(id) initWithName: (NSString *) name;
-(BOOL) removeName: (NSString *) theName;
-(void) addCard: (AddressCard *) theCard;
-(void) addCard2: (AddressCard *) theCard;
-(void) removeCard: (AddressCard *) theCard;
-(AddressBook *) lookup: (NSString *) theName;
-(int) entries;
-(void) list;
-(void) sort;
-(void) printCards;
@end

Code: (Objective-C)

//  AddressBook.m

#import "AddressBook.h"

@implementation AddressBook
@synthesize bookName, book;
-(id) initWithName: (NSString *) name
{
    self = [super init];
    
    if (self) {
        bookName = [NSString stringWithString: name];
        book = [NSMutableArray array];
    }
    return self;
}
-(id) init
{
    return [self initWithName: @"NoName"];
}
-(BOOL) removeName: (NSString *) theName
{
    AddressBook *results = [self lookup: theName]; 
    AddressCard *holder;
    if (results.book.count == 1)  {
        for ( AddressCard *nextCard in book ) {
            if ( [nextCard search: theName]) 
                holder = nextCard;
            }
        [self removeCard: holder];
        return YES;
    }
    return NO;
}
-(void) addCard: (AddressCard *) theCard
{
    [book addObject: theCard];
}
-(void) addCard2: (AddressCard *) theCard //with ownership
{
    AddressCard *holder = [AddressCard createWithAddressCard: theCard];
    [book addObject: holder];
}
-(void) removeCard: (AddressCard *) theCard
{
    [book removeObjectIdenticalTo: theCard];
}
-(AddressBook *) lookup: (NSString *) theName 
{
    AddressBook *results = [[AddressBook alloc] initWithName: @"lookup results"];
    
    for ( AddressCard *nextCard in book ) {
        if ( [nextCard search: theName])
            [results addCard: nextCard];
    }
    
    if (results.book.count == 0)
        return nil;
    
    return results;
}
-(int) entries
{
    return (int)[book count];
}
-(void) list
{
    NSLog (@"======== Contents of: %@ =========", bookName);
    
    for ( AddressCard *theCard in book )
        NSLog (@"%-20s   %-32s", [theCard.name UTF8String], [theCard.email UTF8String]);
    
    NSLog (@"==================================================");
}
-(void) sort
{
    [book sortUsingSelector: @selector(compareNames:)];
}
-(void) printCards
{
    NSLog (@"======== Contents of: %@ =========", bookName);
    
    for ( AddressCard *theCard in book ) {
        NSLog (@"====================================");
        NSLog (@"|                                  |");
        NSLog (@"|  %-31s |", [theCard.name UTF8String]);
        NSLog (@"|  %-31s |", [theCard.firstname UTF8String]);
        NSLog (@"|  %-31s |", [theCard.lastname UTF8String]);
        NSLog (@"|  %-31s |", [theCard.address UTF8String]);
        NSLog (@"|  %-31s |", [theCard.city UTF8String]);
        NSLog (@"|  %-31s |", [theCard.zip UTF8String]);
        NSLog (@"|  %-31s |", [theCard.country UTF8String]);
        NSLog (@"|  %-31s |", [theCard.phone UTF8String]);
        NSLog (@"|  %-31s |", [theCard.email UTF8String]);
        NSLog (@"|                                  |");
        NSLog (@"|                                  |");
        NSLog (@"|                                  |");
        NSLog (@"====================================");
        NSLog (@" ");
    }
}
@end

Code: (Objective-C)

//  AddressCard.h

#import <Foundation/Foundation.h>

@interface AddressCard: NSObject
@property (copy, nonatomic) NSString *name, *firstname, *lastname, *address, *city, *zip, *country, *phone, *email;
-(id) initWithName: (NSString *) name_;
+(AddressCard *) createWithAddressCard: (AddressCard *) theCard;
-(void) setName: (NSString *) theName andEmail: (NSString *) theEmail;
-(void) setName: (NSString *) theName andEmail: (NSString *) theEmail andAddress: (NSString *) theAddress andCity: (NSString *) theCity 
         andZip: (NSString *) theZip andCountry: (NSString *) theCountry andPhone: (NSString *) thePhone;
-(void) print;
-(void) printAll;
-(BOOL) search: (NSString *) criteria;
-(NSComparisonResult) compareNames: (id) element;
@end

Code: (Objective-C)

//  AddressCard.m

#import "AddressCard.h"

@implementation AddressCard
@synthesize name, firstname, lastname, address, city, zip, country, phone, email;
-(id) initWithName: (NSString *) name_
{
    self = [super init];
    
    if (self) {
        name = [NSString stringWithString: name_];
        NSRange space = [[self name] rangeOfString: @" "];
        firstname = [[self name] substringToIndex: space.location];
        lastname = [[self name] substringFromIndex: space.location + 1];
        address =  @" ";
        city =  @" ";
        zip =  @" ";
        country =  @" ";
        phone =  @" ";
        email =  @" ";
    }
    return self;
}
-(id) init
{
    return [self initWithName: @"noFirstName orLastName"];
}
+(AddressCard *) createWithAddressCard: (AddressCard *) theCard
{
    AddressCard *result = [[AddressCard alloc] init];
    result.name = [NSString stringWithString: theCard.name];
    NSRange space = [[result name] rangeOfString: @" "];
    result.firstname = [[result name] substringToIndex: space.location];
    result.lastname = [[result name] substringFromIndex: space.location + 1];
    result.address =  [NSString stringWithString: theCard.address];
    result.city =  [NSString stringWithString: theCard.city];
    result.zip =  [NSString stringWithString: theCard.zip];
    result.country =  [NSString stringWithString: theCard.country];
    result.phone =  [NSString stringWithString: theCard.phone];
    result.email =  [NSString stringWithString: theCard.email];
    
    return result;
}
-(void) setName: (NSString *) theName andEmail: (NSString *) theEmail
{
    self.name = theName;
    NSRange space = [[self name] rangeOfString: @" "]; 
    self.firstname = [[self name] substringToIndex: space.location]; 
    self.lastname = [[self name] substringFromIndex: space.location + 1];
    self.email = theEmail;
    self.address = @" ";
    self.city = @" ";
    self.zip = @" ";
    self.country = @" ";
    self.phone = @" ";
}
-(void) setName: (NSString *) theName andEmail: (NSString *) theEmail andAddress: (NSString *) theAddress andCity: (NSString *) theCity 
         andZip: (NSString *) theZip andCountry: (NSString *) theCountry andPhone: (NSString *) thePhone
{
    self.name = theName;
    NSRange space = [[self name] rangeOfString: @" "];
    self.email = theEmail;
    self.firstname = [[self name] substringToIndex: space.location]; 
    self.lastname = [[self name] substringFromIndex: space.location + 1];
    self.address = theAddress;
    self.city = theCity;
    self.zip = theZip;
    self.country = theCountry;
    self.phone = thePhone;
}
-(void) print
{
    NSLog (@"====================================");
    NSLog (@"|                                  |");
    NSLog (@"|  %-31s |", [name UTF8String]);
    NSLog (@"|  %-31s |", [email UTF8String]);
    NSLog (@"|                                  |");
    NSLog (@"|                                  |");
    NSLog (@"|                                  |");
    NSLog (@"====================================");
}
-(void) printAll
{
    NSLog (@"====================================");
    NSLog (@"|                                  |");
    NSLog (@"|  %-31s |", [name UTF8String]);
    NSLog (@"|  %-31s |", [firstname UTF8String]);
    NSLog (@"|  %-31s |", [lastname UTF8String]);
    NSLog (@"|  %-31s |", [address UTF8String]);
    NSLog (@"|  %-31s |", [city UTF8String]);
    NSLog (@"|  %-31s |", [zip UTF8String]);
    NSLog (@"|  %-31s |", [country UTF8String]);
    NSLog (@"|  %-31s |", [phone UTF8String]);
    NSLog (@"|  %-31s |", [email UTF8String]);
    NSLog (@"|                                  |");
    NSLog (@"|                                  |");
    NSLog (@"|                                  |");
    NSLog (@"====================================");
}
-(BOOL) search: (NSString *) criteria
{
    if ( [self.name rangeOfString: criteria options: NSCaseInsensitiveSearch].location != NSNotFound) 
        return YES;
    else if ( [self.address rangeOfString: criteria options: NSCaseInsensitiveSearch].location != NSNotFound) 
        return YES;
    else if ( [self.city rangeOfString: criteria options: NSCaseInsensitiveSearch].location != NSNotFound) 
        return YES;
    else if ( [self.zip rangeOfString: criteria options: NSCaseInsensitiveSearch].location != NSNotFound) 
        return YES;
    else if ( [self.country rangeOfString: criteria options: NSCaseInsensitiveSearch].location != NSNotFound) 
        return YES;
    else if ( [self.phone rangeOfString: criteria options: NSCaseInsensitiveSearch].location != NSNotFound) 
        return YES;
    else if ( [self.email rangeOfString: criteria options: NSCaseInsensitiveSearch].location != NSNotFound) 
        return YES;
    
    return NO;
}
-(NSComparisonResult) compareNames: (id) element
{
    return [name compare: [element name]];
}
@end

Output:

======== Contents of: Linda’s Address Book =========
Julia Kochan           jewls337@axlc.com              
Tony Iannino           tony.iannino@techfitness.com    
Stephen Kochan         steve@classroomM.com            
Jamie Baker            jbaker@classroomM.com          
Ella Smith             ella.smith@csmithent.com        
==================================================
Julia Kochan card changed from card1
card1 info:
====================================
|                                  |
|  Card1 test                      |
|  Card1                           |
|  test                            |
|  test                            |
|  test                            |
|  test                            |
|  test                            |
|  test                            |
|  test                            |
|                                  |
|                                  |
|                                  |
====================================
======== Contents of: Linda’s Address Book =========
Julia Kochan           jewls337@axlc.com              
Tony Iannino           tony.iannino@techfitness.com    
Stephen Kochan         steve@classroomM.com            
Jamie Baker            jbaker@classroomM.com          
Ella Smith             ella.smith@csmithent.com        
==================================================
remove: steve
remove successful
======== Contents of: Linda’s Address Book =========
Julia Kochan           jewls337@axlc.com              
Tony Iannino           tony.iannino@techfitness.com    
Jamie Baker            jbaker@classroomM.com          
Ella Smith             ella.smith@csmithent.com        
==================================================
card3 info:
====================================
|                                  |
|  Stephen Kochan                  |
|  Stephen                         |
|  Kochan                          |
|                                  |
|                                  |
|                                  |
|                                  |
|                                  |
|  steve@classroomM.com            |
|                                  |
|                                  |
|                                  |
====================================