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DJGeocoder.h

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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

DJGeocoder.m

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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