How to deserialize nested element ?

[Benhajones]

Hi,

I 'have trying to deserialized a nested XML with SWXMLHash, I was wordering if someone could help me ?
here an extract of the XML :

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<kml
	xmlns="http://www.opengis.net/kml/2.2"
	xmlns:gx="http://www.google.com/kml/ext/2.2"
	xmlns:xal="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0"
	xmlns:atom="http://www.w3.org/2005/Atom">
	<Document>
		<name>Stations</name>
		<Style id="AVAILABLE">
			<IconStyle>
				<scale>1.0</scale>
				<heading>0.0</heading>
				<Icon>
					<href>http://maps.google.com/mapfiles/kml/paddle/grn-circle.png</href>
					<refreshInterval>0.0</refreshInterval>
					<viewRefreshTime>0.0</viewRefreshTime>
					<viewBoundScale>0.0</viewBoundScale>
				</Icon>
			</IconStyle>
		</Style>
		<Style id="UNAVAILABLE">
			<IconStyle>
				<scale>1.0</scale>
				<heading>0.0</heading>
				<Icon>
					<href>http://maps.google.com/mapfiles/kml/paddle/red-circle.png</href>
					<refreshInterval>0.0</refreshInterval>
					<viewRefreshTime>0.0</viewRefreshTime>
					<viewBoundScale>0.0</viewBoundScale>
				</Icon>
			</IconStyle>
		</Style>
		<Placemark>
			<name>Esch-sur-Alzette - Parking souterrain Brill - Place de la Résistance</name>
			<visibility>1</visibility>
			<address>Rue Louis Pasteur, L-4276 Esch-sur-Alzette Luxembourg</address>
			<description>&lt;span&gt;&lt;b&gt;4&lt;/b&gt; connectors with 22kW and Type 2 connector&lt;span&gt;&lt;br/&gt;&lt;span&gt;&lt;b&gt;4&lt;/b&gt; available connectors&lt;span&gt;&lt;br/&gt;&lt;span&gt;&lt;b&gt;0&lt;/b&gt; occupied connectors&lt;span&gt;&lt;br/&gt;</description>
			<styleUrl>#AVAILABLE</styleUrl>
			<ExtendedData>
				<Data name="CPnum">
					<displayName>Number of chargingpoints</displayName>
					<value>4</value>
				</Data>
				<Data name="chargingdevice">
					<displayName>Charging device</displayName>
					<value>{"id":10644,"name":"CP2500","numberOfConnectors":2,"connectors":[{"id":59985,"name":"CP2500 - 1","maxchspeed":22.08,"connector":1,"description":"AVAILABLE"},{"id":59986,"name":"CP2500 - 2","maxchspeed":22.08,"connector":2,"description":"AVAILABLE"}]}</value>
				</Data>
				<Data name="chargingdevice">
					<displayName>Charging device</displayName>
					<value>{"id":10645,"name":"CP2501","numberOfConnectors":2,"connectors":[{"id":59987,"name":"CP2501 - 1","maxchspeed":22.08,"connector":1,"description":"AVAILABLE"},{"id":59988,"name":"CP2501 - 2","maxchspeed":22.08,"connector":2,"description":"AVAILABLE"}]}</value>
				</Data>
			</ExtendedData>
			<Point>
				<altitudeMode>clampToGround</altitudeMode>
				<coordinates>5.97622,49.492728</coordinates>
			</Point>
		</Placemark>

here is the struct and the function I'm using :

struct XMLPlacemark: XMLObjectDeserialization {
    var name: String
    var visibility: Int
    var address: String
    var description: String
    var styleUrl: String
    var cpnumber : Int
    var chargingdevice : [String]
    
    static func deserialize(_ node: XMLIndexer) throws -> XMLPlacemark {
        return try XMLPlacemark(
            name: node["name"].value(),
            visibility: node["visibility"].value(),
            address: node["address"].value(),
            description: node["description"].value(),
            styleUrl: node["styleUrl"].value(),
            cpnumber: node["ExtendedData"]["Data"].withAttribute("name", "CPnum")["value"].value(),
            chargingdevice: node["ExtendedData"]["Data"].withAttribute("name","chargingdevice")["value"].value()   
        )
    }
}

func loadtest() {
    let xml = XMLHash.parse(stationXML)
    if let station: [XMLPlacemark] = try? xml["kml"]["Document"]["Placemark"].value() {
        station.forEach {station in
            print("\(station.chargingdevice)")
            
        }
    }
}

Here is the result I get :

["{\"id\":10644,\"name\":\"CP2500\",\"numberOfConnectors\":2,\"connectors\":[{\"id\":59985,\"name\":\"CP2500 - 1\",\"maxchspeed\":22.08,\"connector\":1,\"description\":\"AVAILABLE\"},{\"id\":59986,\"name\":\"CP2500 - 2\",\"maxchspeed\":22.08,\"connector\":2,\"description\":\"AVAILABLE\"}]}"]

I'm missing the other value of the node :

<value>{"id":10645,"name":"CP2501",....

Any idea ?

[Benhajones]

@drmohundro @norio-nomura @st3fan @korzonek

[drmohundro]

@Benhajones I'll see if I can take a look today.

[drmohundro]

Okay, so I understand what the issue is here. The withAttribute method only returns a single attribute match, not all matches. That's why it is only returning the first match. You can see the implementation here: https://github.com/drmohundro/SWXMLHash/blob/main/Source/XMLIndexer.swift#L159.

Because you're wanting to filter on these types, you'll need to tweak the implementation slightly. Here is a test I wrote that works the way you're expecting:

    struct XMLPlacemark: XMLObjectDeserialization {
        var name: String
        var visibility: Int
        var address: String
        var description: String
        var styleUrl: String
        var cpnumber : Int
        var chargingdevice : [String]
        
        static func deserialize(_ node: XMLIndexer) throws -> XMLPlacemark {
            var devices: [String] = []
            for dataElem in node["ExtendedData"]["Data"].all {
                if (dataElem.element?.attribute(by: "name")?.text == "chargingdevice") {
                    devices.append(try dataElem["value"].value())
                }
            }
            
            return try XMLPlacemark(
                name: node["name"].value(),
                visibility: node["visibility"].value(),
                address: node["address"].value(),
                description: node["description"].value(),
                styleUrl: node["styleUrl"].value(),
                cpnumber: node["ExtendedData"]["Data"].withAttribute("name", "CPnum")["value"].value(),
                chargingdevice: devices
            )
        }
    }

    func testLoading() {
        let xml = XMLHash.parse(xmlWithComplexType)
        do {
            let station: [XMLPlacemark] = try xml["kml"]["Document"]["Placemark"].value()
            station.forEach {station in
                print("hello")
                print("\(station.chargingdevice)")
                
            }
        } catch {
            print("failure? \(error)")
        }
    }

Hope this helps!

I also answered the question on StackOverflow, too.

[Benhajones]

Thank you ! @drmohundro