Data Get Parameters from File

Description: properties and methods for getting data for map from file.

The MapDataSource.h File

#import <MapCharting/MapChartDataSource.h>
@interface MapDataSource : NSObject<MapChartDataSource> {
    int m_index;
    NSMutableDictionary *m_fictionalData; // Data dictionary
    NSMutableArray *m_timelineTitles; // Array of labels for timeline
    NSMutableArray *m_timeLineDate; // Array of dates
}
// Loads data dfrom file with specified name
- (id) initWithFileName:(NSString *) name;
// Determines minimum and maximum data values
- (void) prepare;
@property (readonly,assign) double minValue; // Minimum data value
@property (readonly,assign) double maxValue; // Maximum data value
@property (atomic,assign) NSObject* objectId; // Identifier of map layer current area
@end

The MapDataSource.m File

#import "MapDataSource.h"
@implementation MapDataSource
@synthesize minValue = m_minValue;
@synthesize maxValue = m_maxValue;
@synthesize objectId = m_objectId;
// Loads data from file with specified name
- (id)initWithFileName:(NSString *)name
{
    self = [super init];
    if (self) {
        // Get file path
        NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:nil];
        // Read file contents
        NSString *dataString = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
        m_timeLineDate = [NSMutableArray new];
        // Split string with file contents into substrings split with line break character
        NSArray *lines = [dataString componentsSeparatedByString:@"\n"];
        NSMutableArray *data = [NSMutableArray new];
        for (NSString *line in lines) {
            // Split each string into substrings split with the character ";"
            [data addObject:[line componentsSeparatedByString:@";"]];
        }
        m_timelineTitles = [[data objectAtIndex:0] mutableCopy];
        [m_timelineTitles removeObjectAtIndex:0];
        m_fictionalData = [NSMutableDictionary new];
        // Insert data on each country to dictionary
        for (int i = 1; i < [data count]; i++) {
            NSArray *line = [data objectAtIndex:i];
            NSString *key = (NSString*)[line objectAtIndex:0];
            NSMutableArray *values = [NSMutableArray new];
            for (int j = 1; j < [line count]; j++) {
                [values addObject:[NSNumber numberWithFloat:[[line objectAtIndex:j] floatValue]] ];
            }
            [m_fictionalData setValue:values forKey:key];
        }
    }
    return self;
}
// Determines minimum and maximum data values
- (void) prepare
{
    BOOL startPrepare = YES;
    for (NSArray *series in [m_fictionalData allValues]) {
        for (int i = 0; i < [series count]; i++) {
            if(startPrepare)
            {
                m_minValue = [[series objectAtIndex:i] doubleValue];
                m_maxValue = [[series objectAtIndex:i] doubleValue];
                startPrepare = NO;
                continue;
            }
            double val = [[series objectAtIndex:i] doubleValue];
            if(m_minValue > val)
            m_minValue = val;
            if(m_maxValue < val)
            m_maxValue = val;
        }
    }
}
// Returns array of dates
- (NSArray *) timestampArray
{
    return m_timeLineDate;
}
// Returns array of timeline labels
- (NSArray *) timestampTitles
{
    return m_timelineTitles;
}
// Returns name of used data cube
-(NSString *) cubeName {
    return @"undefined";
}
// Sets index specifying value number in country data array
- (void) setIndex:(int)index
{
    m_index = index;
}
// Returns maximum allowed index value
-(int)maxIndex {
    NSArray *values = [[m_fictionalData allValues] objectAtIndex:0];
    if (values != nil) {
        return [values count];
        } else {
        return 0;
    }
}
// Returns value for current map area layer
-(NSNumber *) value {
    NSArray *values = [m_fictionalData objectForKey:[self objectId]];
    if (values != nil && m_index <= [self maxIndex]) {
        return [values objectAtIndex:m_index];
        } else {
        return [NSNumber numberWithInt:0];
    }
}
// Returns data for specified country for specified year of their dimension
- (NSNumber *)valueWithId:(NSObject *)objectId forIndex:(int)index {
    [self setObjectId:objectId];
    [self setIndex:index];
    return [self value];
}
// Returns data for specified map layer area for specified year of their dimension
- (NSNumber *)valueWithId:(NSNumber *)objectId {
    return [self valueWithId:objectId forIndex:m_index];
}
// Returns data for map layer area for all dates of their dimension
- (NSArray *)seriesWithId:(NSNumber *)objectId
{
    NSMutableArray *series = [NSMutableArray new];
    series = [m_fictionalData valueForKey:[NSString stringWithFormat:@"%@", objectId]];
    return series;
}
@end

See also:

Creating a Map with a Timeline