JSON Jamboree: Apex कॉलआउट के लिए फ़िक्स्ड बनाम डायनेमिक डीसीरियलाइज़ेशन का मुक़ाबला

public class OS_FlightStatusModel

{

    public String icao24 {get;set;}

    public Integer firstSeen {get;set;}

    public String estDepartureAirport {get;set;}

    public Integer lastSeen {get;set;}

    public String estArrivalAirport {get;set;}

    public String callsign {get;set;}

    public Integer estDepartureAirportHorizDistance {get;set;}

    public Integer estDepartureAirportVertDistance {get;set;}

    public Integer estArrivalAirportHorizDistance {get;set;}

    public Integer estArrivalAirportVertDistance {get;set;}

    public Integer departureAirportCandidatesCount {get;set;}

    public Integer arrivalAirportCandidatesCount {get;set;}

    //---Use the JSON Deserialize

    public static List<OS_FlightStatusModel> parse(String json)

    {

        return (List<OS_FlightStatusModel>) System.JSON.deserialize(json, List<OS_FlightStatusModel>.class);

    }

}

//---Get the Flight Request

 private static List<OS_FlightStatusModel> getFlightRequest(String requestURL)

 {

//---Return structure

List<OS_FlightStatusModel> retList = new List<OS_FlightStatusModel>();

//---Make the request

HttpResponse resp = getRequest( requestURL);

//---Check for Success

Integer respStatusCode = resp.getStatusCode();

if (respStatusCode == 200)

 {

//---Read the Payload

String payload = resp.getBody();

debug('Payload: ' + payload);

//---Parse the payload

retList = OS_FlightStatusModel.parse(payload);

if (retList != null)

 {

System.debug('Found ' + retList.size() + ' records');

for( OS_FlightStatusModel mRow : retList)

 {

debug('Row: ' + mRow);

 }

 }

 }

else

 {

//---Handle an error

debug('Response Status Code: ' + respStatusCode);

 }

return retList;

 }

/****************************************************************************************

* @Name OS_StateModelParser

* @Author Steve Simpson - steve@stevetecharc.com

* @Date 2023

*

* @Description Parser for reading State Models from JSON

****************************************************************************************

* Version Developer Date Description

*----------------------------------------------------------------------------------------

* 1.0 Steve Simpson 2023 Initial Creation

****************************************************************************************/

public with sharing class OS_StateModelParser extends OS_BaseParser

{

private OS_StateResponseModel responseModel {get; set;}

//--Parse the payload into the OS_StateResponseModel

public OS_StateResponseModel parse(String json)

 {

//---Setup the return value

responseModel = new OS_StateResponseModel();

responseModel.States = new List<OS_StateModel>();

try

 {

parseBody(json);

 }

catch (Exception ex)

 {

debug( 'Exception: ' + ex.getMessage() + ' ' + ex.getStackTraceString());

debugJSON(json);

 }

return responseModel;

 }

//---Parse the body of the JSON

private void parseBody(String json)

 {

//---Set the default Page Size

if (PageSize == 0) PageSize = DEFAULT_PAGE_SIZE;

Boolean hasTokenTime = false;

Boolean hasTokenStates = false;

JSONParser parser = System.JSON.createParser(json);

//---Read Token by Token

while (parser.nextToken() != System.JSONToken.END_OBJECT)

 {

//---Read the current Token, check its field name

if (parser.getCurrentToken() == System.JSONToken.FIELD_NAME)

 {

String text = parser.getText();

debug( 'Json Token: ' + text);

//---If the next token has a value, then write it, this handles null values

if (parser.nextToken() != System.JSONToken.VALUE_NULL)

 {

//---Read the time

if (text == 'time')

 {

responseModel.ResponseTime = parser.getIntegerValue();

hasTokenTime = true;

 }

//---Read the states

if (text == 'states')

 {

responseModel.States = parseStateList(parser);

hasTokenStates = true;

 }

 }

 }

//---If have both tags, then break out of loop

if (hasTokenStates && hasTokenTime) break;

 }

 }

//---Parse the States

private List<OS_StateModel> parseStateList(JSONParser parser)

 {

CurrentRecord = 0;

//---Build the return list

List<OS_StateModel> retList = new List<OS_StateModel>();

//---Go to the next token if needed

if (parser.getCurrentToken() == null) parser.nextToken();

//---Iterate over the items

while (parser.nextToken() != System.JSONToken.END_ARRAY)

 {

CurrentRecord++; //---Track the current record

String logLine = 'Rec: ' + CurrentRecord + ': ';

if (CurrentRecord > getMaxRecord())

 {

//---If past the max record, then break out of loop

debug(logLine + 'End of page');

break;

 }

else if (CurrentRecord >= getFirstRecordToProcess())

 {

//---Build a new State Row

OS_StateModel sModel = new OS_StateModel();

parseStateItem(parser, sModel);

retList.add(sModel);

debug(logLine + 'State: ' + sModel);

 }

else

 {

//---Pass in null model to trigger token advancement without reading values

parseStateItem(parser, null);

debug(logLine + 'Skipped');

 }

 }

return retList;

 }

//---Parse the States

private void parseStateItem(JSONParser parser, OS_StateModel sModel)

 {

//---Go to the next token if needed

if (parser.getCurrentToken() == null) parser.nextToken();

Integer position = 0;

while (parser.nextToken() != System.JSONToken.END_ARRAY)

 {

if (sModel != null && parser.getCurrentToken() != System.JSONToken.VALUE_NULL)

 {

if (position == 0) sModel.icao24 = parser.getText();

if (position == 1) sModel.callsign = parser.getText();

if (position == 2) sModel.origin_country = parser.getText();

if (position == 3) sModel.time_position = parser.getIntegerValue();

if (position == 4) sModel.last_contact = parser.getIntegerValue();

if (position == 5) sModel.longitude = parser.getDoubleValue();

if (position == 6) sModel.latitude = parser.getDoubleValue();

if (position == 7) sModel.baro_altitude = parser.getDoubleValue();

if (position == 8) sModel.on_ground = parser.getBooleanValue();

if (position == 9) sModel.velocity = parser.getDoubleValue();

if (position == 10) sModel.true_track = parser.getDoubleValue();

if (position == 11) sModel.vertical_rate = parser.getDoubleValue();

if (position == 12)

 {

//---Sensors, sub Array, should be null

 }

if (position == 13) sModel.geo_altitude = parser.getDoubleValue();

if (position == 14) sModel.squawk = parser.getText();

if (position == 15) sModel.spi = parser.getBooleanValue();

if (position == 16) sModel.position_source = parser.getIntegerValue();

if (position == 17) sModel.category = parser.getIntegerValue();

 }

position++;

//System.debug('Position ' + position);

 }

 }

}

/****************************************************************************************

* @Name OS_StateSObjectModelParser

* @Author Steve Simpson - steve@stevetecharc.com

* @Date 2023

*

* @Description Parser for reading State Models from JSON

****************************************************************************************

* Version Developer Date Description

*----------------------------------------------------------------------------------------

* 1.0 Steve Simpson 2023 Initial Creation

****************************************************************************************/

public with sharing class OS_StateSObjectModelParser extends OS_BaseParser

{

private OS_StateSObjectResponseModel responseModel {get; set;}

private List<OS_StateMap__mdt> mapList {get;set;}

//--Parse the payload into the OS_StateResponseModel

public OS_StateSObjectResponseModel parse(String json)

 {

mapList = OS_StateMap__mdt.getAll().values();

//---Setup the return value

responseModel = new OS_StateSObjectResponseModel();

responseModel.States = new List<OS_State__c>();

try

 {

parseBody(json);

 }

catch (Exception ex)

 {

debug( 'Exception: ' + ex.getMessage() + ' ' + ex.getStackTraceString());

debugJSON(json);

 }

return responseModel;

 }

//---Parse the body of the JSON

private void parseBody(String json)

 {

//---Set the default Page Size

if (PageSize == 0) PageSize = DEFAULT_PAGE_SIZE;

Boolean hasTokenTime = false;

Boolean hasTokenStates = false;

JSONParser parser = System.JSON.createParser(json);

//---Read Token by Token

while (parser.nextToken() != System.JSONToken.END_OBJECT)

 {

//---Read the current Token, check its field name

if (parser.getCurrentToken() == System.JSONToken.FIELD_NAME)

 {

String text = parser.getText();

debug( 'Json Token: ' + text);

//---If the next token has a value, then write it, this handles null values

if (parser.nextToken() != System.JSONToken.VALUE_NULL)

 {

//---Read the time

if (text == 'time')

 {

responseModel.ResponseTime = parser.getIntegerValue();

hasTokenTime = true;

 }

//---Read the states

if (text == 'states')

 {

responseModel.States = parseStateList(parser);

hasTokenStates = true;

 }

 }

 }

//---If have both tags, then break out of loop

if (hasTokenStates && hasTokenTime) break;

 }

 }

//---Parse the States

private List<OS_State__c> parseStateList(JSONParser parser)

 {

CurrentRecord = 0;

//---Build the return list

List<OS_State__c> retList = new List<OS_State__c>();

//---Go to the next token if needed

if (parser.getCurrentToken() == null) parser.nextToken();

//---Iterate over the items

while (parser.nextToken() != System.JSONToken.END_ARRAY)

 {

CurrentRecord++; //---Track the current record

String logLine = 'Rec: ' + CurrentRecord + ': ';

if (CurrentRecord > getMaxRecord())

 {

//---If past the max record, then break out of loop

debug(logLine + 'End of page');

break;

 }

else if (CurrentRecord >= getFirstRecordToProcess())

 {

//---Build a new State Row

OS_State__c osState = new OS_State__c();

parseStateItem(parser, osState);

retList.add(osState);

debug(logLine + 'State: ' + osState);

 }

else

 {

//---Pass in null model to trigger token advancement without reading values

parseStateItem(parser, null);

debug(logLine + 'Skipped');

 }

 }

return retList;

 }

//---Parse the States

private void parseStateItem(JSONParser parser, OS_State__c osState)

 {

//---Go to the next token if needed

if (parser.getCurrentToken() == null) parser.nextToken();

Integer position = 0;

while (parser.nextToken() != System.JSONToken.END_ARRAY)

 {

if (osState != null && parser.getCurrentToken() != System.JSONToken.VALUE_NULL)

 {

OS_StateMap__mdt curMap = null;

for(OS_StateMap__mdt mapRow : mapList)

 {

if (mapRow.Position__c == position)

 {

curMap = mapRow;

break;

 }

 }

if (curMap != null)

 {

String apiName = curMap.API_Name__c;

if (curMap.Data_Type__c == 'Text')

 {

osState.put(apiName, parser.getText());

 }

if (curMap.Data_Type__c == 'Integer')

 {

osState.put(apiName, parser.getIntegerValue());

 }

if (curMap.Data_Type__c == 'Double')

 {

osState.put(apiName, parser.getDoubleValue());

 }

if (curMap.Data_Type__c == 'Boolean')

 {

osState.put(apiName, parser.getBooleanValue());

 }

 }

 }

position++;

//System.debug('Position ' + position);

 }

 }

}