2_SimpleSectionedTableView/SimpleSectionedTableView/APLRegion.m

 
/*
     File: APLRegion.m
 Abstract: Object to represent a region containing the corresponding time zone wrappers.
 
  Version: 3.0
 
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 */
 
#import "APLRegion.h"
#import "APLTimeZoneWrapper.h"
 
 
@interface APLRegion ()
@property (nonatomic) NSMutableArray *mutableTimeZoneWrappers;
@end
 
 
@implementation APLRegion
 
 
static NSMutableArray *knownRegions = nil;
 
 
+ (NSArray *)knownRegions {
    
    if (knownRegions == nil) {
        [self setUpKnownRegions];
    }
    return knownRegions;
    
}
 
 
-(NSArray *)timeZoneWrappers {
    return _mutableTimeZoneWrappers;
}
 
 
#pragma mark -  Private methods for setting up the regions.
 
- (instancetype)initWithName:(NSString *)regionName {
    
    self = [super init];
 
    if (self) {
        _name = [regionName copy];
        _mutableTimeZoneWrappers = [[NSMutableArray alloc] init];
    }
    return self;
}
 
 
+ (void)setUpKnownRegions {
    
    NSArray *knownTimeZoneNames = [NSTimeZone knownTimeZoneNames];
    
    NSMutableArray *regions = [[NSMutableArray alloc] initWithCapacity:[knownTimeZoneNames count]];
    
    for (NSString *timeZoneName in knownTimeZoneNames) {
        
        NSArray *nameComponents = [timeZoneName componentsSeparatedByString:@"/"];
        NSString *regionName = [nameComponents objectAtIndex:0];
        
        // Get the region  with the region name, or create it if it doesn't exist.
        APLRegion *region = nil;
        
        for (APLRegion *aRegion in regions) {
            if ([aRegion.name isEqualToString:regionName]) {
                region = aRegion;
                break;
            }
        }
        
        if (region == nil) {
            region = [[APLRegion alloc] initWithName:regionName];
            [regions addObject:region];
        }
        
        NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:timeZoneName];
        APLTimeZoneWrapper *timeZoneWrapper = [[APLTimeZoneWrapper alloc] initWithTimeZone:timeZone nameComponents:nameComponents];
        [region addTimeZoneWrapper:timeZoneWrapper];
    }
    
    // Sort the time zones by locale name.
    NSSortDescriptor *localeNameSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"localeName" ascending:YES comparator:^(id name1, id name2) {
 
        return [(NSString *)name1 localizedStandardCompare:(NSString *)name2];
    }];
 
    for (APLRegion *aRegion in regions) {
        [aRegion.mutableTimeZoneWrappers sortUsingDescriptors:@[localeNameSortDescriptor]];
    }
    
    // Sort the regions by name.
    NSSortDescriptor *nameSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES comparator:^(id name1, id name2) {
 
        return [(NSString *)name1 localizedStandardCompare:(NSString *)name2];
    }];
 
    [regions sortUsingDescriptors:@[nameSortDescriptor]];
    
    knownRegions = regions;
}   
 
 
- (void)addTimeZoneWrapper:(APLTimeZoneWrapper *)timeZoneWrapper {
    [self.mutableTimeZoneWrappers addObject:timeZoneWrapper];
}
 
 
@end