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derrickj committed Mar 28, 2011
0 parents commit 366391873b975417b6894782e0c2d6026d5a60eb
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  1. +48 −0 DJGeocoder.h
  2. +158 −0 DJGeocoder.m
  3. 0 README.md
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//
// DJGeocoder.h
//
//
// Created by Derrick Jones on 3/23/11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import <Foundation/Foundation.h>
@protocol DJGeocoderDelegate;
@interface DJGeocoder : NSObject <NSXMLParserDelegate>{
@private
id <DJGeocoderDelegate> delegate;
NSString *streetAddress;
NSString *city;
NSString *state;
NSString *country;
NSMutableData *xmlData; // holding place for data returned from google API
NSNumber *theLat;
NSNumber *theLng;
// state variables to facilitate stream parsing
NSMutableString *currentParseString;
BOOL parsingStatus;
BOOL parsingLocation;
BOOL parsingLatitude;
BOOL parsingLongitude;
}
@property (nonatomic, retain) NSString *streetAddress;
@property (nonatomic, retain) NSString *city;
@property (nonatomic, retain) NSString *state;
@property (nonatomic, retain) NSString *country;
@property (nonatomic, retain) id <DJGeocoderDelegate> delegate;
- (void)startAsynchronousRequest;
@end
@protocol DJGeocoderDelegate <NSObject>
@optional
- (void)geocoder:(DJGeocoder *)coder
didSucceedWithLatitude:(NSNumber *)latitude
Longitude:(NSNumber *)longitude Details:(NSDictionary *)details;
- (void)geocoder:(DJGeocoder *)coder didFailWithError:(NSError *)error;
@end
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//
// DJGeocoder.m
//
//
// Created by Derrick Jones on 3/23/11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "DJGeocoder.h"
@implementation DJGeocoder
@synthesize streetAddress, city, state, country, delegate;
- (NSString *)urlEncodedAddress {
//build up string component by component, separated by commas.
//This needs work
NSMutableString *address = [[NSMutableString alloc] init];
if (streetAddress) {
[address appendString:[streetAddress stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
}
if (city) {
[address appendFormat:@",%@", [city stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
}
if (state) {
[address appendFormat:@",%@", [state stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
}
if (country) {
[address appendFormat:@",%@", [country stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
}
return [address autorelease];
}
#pragma mark -
#pragma mark Public API
- (void)startAsynchronousRequest{
// build URL for request with Address (pretend we have it for now)
NSString *address = [self urlEncodedAddress];
NSString *urlString = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/xml?address=%@&sensor=true&",address];
// now that we have a well-formed url string, let's get our request
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
[connection start];
}
#pragma mark -
#pragma mark NSURLConnectionDelegate
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
if (!xmlData) {
xmlData = [[NSMutableData alloc] init];
}
[xmlData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(@"%@", @"Failed!");
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// loading finished, now can parse xml
NSString *xmlString = [[NSString alloc] initWithBytes:[xmlData bytes] length:[xmlData length] encoding:NSUTF8StringEncoding];
[xmlString release];
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:xmlData];
parser.delegate = self;
[parser parse];
}
#pragma mark -
#pragma mark NSXMLParserDelegate
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
if ([elementName isEqual:@"status"]) {
parsingStatus = YES;
} else if ([elementName isEqual:@"location"]) {
parsingLocation = YES;
} else if ([elementName isEqual:@"lat"]) {
parsingLatitude = YES;
} else if ([elementName isEqual:@"lng"]) {
parsingLongitude = YES;
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if ([elementName isEqual:@"status"]) {
parsingStatus = NO;
NSLog(@"status: %@", currentParseString);
// if status is not OK, probably need to abort parsing and send message
[currentParseString release];
currentParseString = nil;
} else if ([elementName isEqual:@"location"]) {
parsingLocation = NO;
// never built string for location, so no need to reset it
} else if (parsingLocation && [elementName isEqual:@"lat"]) {
parsingLatitude = NO;
NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease];
theLat = [formatter numberFromString:currentParseString];
[currentParseString release];
currentParseString = nil;
} else if (parsingLocation && [elementName isEqual:@"lng"]) {
parsingLongitude = NO;
NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease];
theLng = [formatter numberFromString:currentParseString];
[currentParseString release];
currentParseString = nil;
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
// only build up string when parsing one of the fields we are interested in
// Interested in: Request status, as well as latitude/longitude, but only when child of location
// http://code.google.com/apis/maps/documentation/geocoding/#XML
if (parsingStatus || (parsingLocation && (parsingLatitude || parsingLongitude))) {
if (!currentParseString) {
currentParseString = [[NSMutableString alloc] init];
}
[currentParseString appendString:string];
}
}
- (void)parserDidEndDocument:(NSXMLParser *)parser {
// call delegate method with latitude and longitude.
// probably use details NSDictionary to provide more info at some point
if ([delegate respondsToSelector:@selector(geocoder:didSucceedWithLatitude:Longitude:Details:)]) {
[delegate geocoder:self didSucceedWithLatitude:theLat Longitude:theLng Details:nil];
}
[parser release];
}
//FIXME: take care of parser errors
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
}
#pragma mark -
#pragma mark Memory Management
- (void)dealloc {
[delegate release];
[streetAddress release];
[city release];
[state release];
[country release];
[xmlData release];
[theLat release];
[theLng release];
[currentParseString release];
[super dealloc];
}
@end
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