Parse a Google Maps response from a String

GeocodingUtil.cls

public class GeocodingUtil {
    //@future(callout=true)
    public static void callGoogleGeocodingService() {
    /*
        Http httpProtocol = new Http();
        // Create HTTP request to send.  
    
        HttpRequest request = new HttpRequest();
        // Set the endpoint URL.  
    
        String endpoint = 'https://maps.googleapis.com/maps/api/' +
            'geocode/json?address=1+Market+Street,+Suite+300,' +
            '+San+Francisco,+CA&sensor=true';
        request.setEndPoint(endpoint);
        // Set the HTTP verb to GET.  
    
        request.setMethod('GET');
        // Send the HTTP request and get the response.  
    
        // The response is in JSON format.  
    
        HttpResponse response = httpProtocol.send(request);
       
        // Create JSON parser with the HTTP response body   
    
        // as an input string.  
    
        JSONParser parser = JSON.createParser(response.getBody());
        */
        String str = '{' +
			'   "results" : [' +
			'      {' +
			'         "address_components" : [' +
			'            {' +
			'               "long_name" : "300",' +
			'               "short_name" : "300",' +
			'               "types" : [ "subpremise" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "1",' +
			'               "short_name" : "1",' +
			'               "types" : [ "street_number" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "Market St",' +
			'               "short_name" : "Market St",' +
			'               "types" : [ "route" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "San Francisco",' +
			'               "short_name" : "San Francisco",' +
			'               "types" : [ "locality", "political" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "San Francisco",' +
			'               "short_name" : "San Francisco",' +
			'               "types" : [ "administrative_area_level_3", "political" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "San Francisco",' +
			'               "short_name" : "San Francisco",' +
			'               "types" : [ "administrative_area_level_2", "political" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "California",' +
			'               "short_name" : "CA",' +
			'               "types" : [ "administrative_area_level_1", "political" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "United States",' +
			'               "short_name" : "US",' +
			'               "types" : [ "country", "political" ]' +
			'            },' +
			'            {' +
			'               "long_name" : "94105",' +
			'               "short_name" : "94105",' +
			'               "types" : [ "postal_code" ]' +
			'            }' +
			'         ],' +
			'         "formatted_address" : "1 Market St #300, San Francisco, CA 94105, United States",' +
			'         "geometry" : {' +
			'            "location" : {' +
			'               "lat" : 37.79410130,' +
			'               "lng" : -122.39510960' +
			'            },' +
			'            "location_type" : "APPROXIMATE",' +
			'            "viewport" : {' +
			'               "northeast" : {' +
			'                  "lat" : 37.79545028029150,' +
			'                  "lng" : -122.3937606197085' +
			'               },' +
			'               "southwest" : {' +
			'                  "lat" : 37.79275231970851,' +
			'                  "lng" : -122.3964585802915' +
			'               }' +
			'            }' +
			'         },' +
			'         "partial_match" : true,' +
			'         "types" : [ "subpremise" ]' +
			'      }' +
			'   ],' +
			'   "status" : "OK"' +
			'}';

        JSONParser parser = JSON.createParser(str);
        Double latitude = 0.0;
        Double longitude = 0.0;
        // Parse JSON response to get individual field values.  
    
        while (parser.nextToken() != null) {
            // Extract the latitude and longitude values from   
    
            // the geometry object.  
    
            // Example of part of the JSON response   
    
            // that contains the geometry object:  
    
            // "geometry": {  
    
            //   "location": {  
    
            //     "lat": 37.7941078,  
    
            //     "lng": -122.3951158  
    
            // },  
    
            // Look for the geometry field. 
    
            if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) && 
                (parser.getText() == 'geometry')) {
                // Advance to the location field.  
    
                while (parser.nextToken() != null) {
                    if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) && 
                        (parser.getText() == 'location')) {
                        // Advance to the latitude and longitude fields.  
    
                        while (parser.nextToken() != null) {
                            if ((parser.getCurrentToken() ==
                                JSONToken.FIELD_NAME)
                                && (parser.getText() == 'lat')) {
                                parser.nextToken();
                                // Store the latitude value in a variable.  
    
                                latitude = parser.getDoubleValue();
                                system.Debug(parser.getCurrentName() + ':'+ latitude);
                            }
                            else if ((parser.getCurrentToken() ==
                                JSONToken.FIELD_NAME)&& 
                                (parser.getText() == 'lng')) {
                                parser.nextToken();
                                // Store the longitude value in a variable.  
    
                                longitude = parser.getDoubleValue();
                                system.Debug(parser.getCurrentName() + ':'+ longitude);
                            }
                        }                       
                    }
                }                              
            }
        }
        
    }
}