我正在将一些 xml 映射到一个案例类并且它工作正常，但我有一种感觉，我的命令性眼罩让我看不到更好的功能解决方案。谁能提出比这更好的方法:
def buildAddress(geocodeResponse: NodeSeq) : Address = {
val addressNodes = geocodeResponse \\ "address_component"
var street = " "
var town = ""
var suburb = ""
var province = ""
var country = ""
var postalCode = ""
addressNodes.foreach {node =>
val typeString = (node \ "type").head.text
if ("street_number" == typeString) {
street = (node \ "long_name").text + street
}
else if ("route" == typeString) {
street = street + (node \ "long_name").text
}
else if ("locality" == typeString) {
town = (node \ "long_name").text
}
else if ("sublocality" == typeString) {
suburb = (node \ "long_name").text
}
else if ("administrative_area_level_1" == typeString) {
province = (node \ "long_name").text
}
else if ("country" == typeString) {
country = (node \ "long_name").text
}
else if ("postal_code" == typeString) {
town = (node \ "long_name").text
}
}
Address(street,suburb,town,province,country,postalCode)
}
本例中的 xml 是使用 Dispatch 从 Google 地理编码 API 中检索的。
import dispatch._
def lookupAddress(lat: Double, long: Double): Address = {
val position = lat.toString + "," + long.toString
val req = url("http://maps.googleapis.com/maps/api/geocode/xml") <<? Map("latlng" -> position, "sensor" -> "true")
Http(req </> {
nodes => buildAddress(nodes)
})
}
xml 结果如下所示:
<GeocodeResponse>
<status>OK</status>
<result>
<type>street_address</type>
<formatted_address>3 Louw St, Stellenbosch 7600, South Africa</formatted_address>
<address_component>
<long_name>3</long_name>
<short_name>3</short_name>
<type>street_number</type>
</address_component>
<address_component>
<long_name>Louw St</long_name>
<short_name>Louw St</short_name>
<type>route</type>
</address_component>
<address_component>
<long_name>Stellenbosch Central</long_name>
<short_name>Stellenbosch Central</short_name>
<type>sublocality</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Stellenbosch</long_name>
<short_name>Stellenbosch</short_name>
<type>locality</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Stellenbosch</long_name>
<short_name>Stellenbosch</short_name>
<type>administrative_area_level_3</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Brede River DC</long_name>
<short_name>Brede River DC</short_name>
<type>administrative_area_level_2</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<address_component>
<long_name>7600</long_name>
<short_name>7600</short_name>
<type>postal_code</type>
</address_component>
<geometry>
<location>
<lat>-33.9403990</lat>
<lng>18.8610090</lng>
</location>
<location_type>ROOFTOP</location_type>
<viewport>
<southwest>
<lat>-33.9435466</lat>
<lng>18.8578614</lng>
</southwest>
<northeast>
<lat>-33.9372514</lat>
<lng>18.8641566</lng>
</northeast>
</viewport>
</geometry>
</result>
<result>
<type>sublocality</type>
<type>political</type>
<formatted_address>Stellenbosch Central, Stellenbosch, South Africa</formatted_address>
<address_component>
<long_name>Stellenbosch Central</long_name>
<short_name>Stellenbosch Central</short_name>
<type>sublocality</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Stellenbosch</long_name>
<short_name>Stellenbosch</short_name>
<type>locality</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Stellenbosch</long_name>
<short_name>Stellenbosch</short_name>
<type>administrative_area_level_3</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Brede River DC</long_name>
<short_name>Brede River DC</short_name>
<type>administrative_area_level_2</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry>
<location>
<lat>-33.9354048</lat>
<lng>18.8640607</lng>
</location>
<location_type>APPROXIMATE</location_type>
<viewport>
<southwest>
<lat>-33.9437180</lat>
<lng>18.8449199</lng>
</southwest>
<northeast>
<lat>-33.9230960</lat>
<lng>18.8778929</lng>
</northeast>
</viewport>
<bounds>
<southwest>
<lat>-33.9437180</lat>
<lng>18.8449199</lng>
</southwest>
<northeast>
<lat>-33.9230960</lat>
<lng>18.8778929</lng>
</northeast>
</bounds>
</geometry>
</result>
<result>
<type>postal_code</type>
<formatted_address>7599, South Africa</formatted_address>
<address_component>
<long_name>7599</long_name>
<short_name>7599</short_name>
<type>postal_code</type>
</address_component>
<address_component>
<long_name>Brede River DC</long_name>
<short_name>Brede River DC</short_name>
<type>administrative_area_level_2</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry>
<location>
<lat>-33.9300286</lat>
<lng>18.8640607</lng>
</location>
<location_type>APPROXIMATE</location_type>
<viewport>
<southwest>
<lat>-33.9693080</lat>
<lng>18.8019200</lng>
</southwest>
<northeast>
<lat>-33.8700550</lat>
<lng>18.9232900</lng>
</northeast>
</viewport>
<bounds>
<southwest>
<lat>-33.9693080</lat>
<lng>18.8019200</lng>
</southwest>
<northeast>
<lat>-33.8700550</lat>
<lng>18.9232900</lng>
</northeast>
</bounds>
</geometry>
</result>
<result>
<type>locality</type>
<type>political</type>
<formatted_address>Stellenbosch, South Africa</formatted_address>
<address_component>
<long_name>Stellenbosch</long_name>
<short_name>Stellenbosch</short_name>
<type>locality</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Stellenbosch</long_name>
<short_name>Stellenbosch</short_name>
<type>administrative_area_level_3</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Brede River DC</long_name>
<short_name>Brede River DC</short_name>
<type>administrative_area_level_2</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry>
<location>
<lat>-33.9366667</lat>
<lng>18.8613889</lng>
</location>
<location_type>APPROXIMATE</location_type>
<viewport>
<southwest>
<lat>-34.0150869</lat>
<lng>18.7658819</lng>
</southwest>
<northeast>
<lat>-33.8782960</lat>
<lng>18.9232900</lng>
</northeast>
</viewport>
<bounds>
<southwest>
<lat>-34.0150869</lat>
<lng>18.7658819</lng>
</southwest>
<northeast>
<lat>-33.8782960</lat>
<lng>18.9232900</lng>
</northeast>
</bounds>
</geometry>
</result>
<result>
<type>postal_code</type>
<formatted_address>7600, South Africa</formatted_address>
<address_component>
<long_name>7600</long_name>
<short_name>7600</short_name>
<type>postal_code</type>
</address_component>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry/>
</result>
<result>
<type>administrative_area_level_3</type>
<type>political</type>
<formatted_address>Stellenbosch, South Africa</formatted_address>
<address_component>
<long_name>Stellenbosch</long_name>
<short_name>Stellenbosch</short_name>
<type>administrative_area_level_3</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Brede River DC</long_name>
<short_name>Brede River DC</short_name>
<type>administrative_area_level_2</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry>
<location>
<lat>-33.9405478</lat>
<lng>18.9502232</lng>
</location>
<location_type>APPROXIMATE</location_type>
<viewport>
<southwest>
<lat>-34.0633899</lat>
<lng>18.7083300</lng>
</southwest>
<northeast>
<lat>-33.7933599</lat>
<lng>19.2438000</lng>
</northeast>
</viewport>
<bounds>
<southwest>
<lat>-34.0633899</lat>
<lng>18.7083300</lng>
</southwest>
<northeast>
<lat>-33.7933599</lat>
<lng>19.2438000</lng>
</northeast>
</bounds>
</geometry>
</result>
<result>
<type>administrative_area_level_2</type>
<type>political</type>
<formatted_address>Brede River DC, South Africa</formatted_address>
<address_component>
<long_name>Brede River DC</long_name>
<short_name>Brede River DC</short_name>
<type>administrative_area_level_2</type>
<type>political</type>
</address_component>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry>
<location>
<lat>-33.4220698</lat>
<lng>19.7591675</lng>
</location>
<location_type>APPROXIMATE</location_type>
<viewport>
<southwest>
<lat>-34.1172599</lat>
<lng>18.7083299</lng>
</southwest>
<northeast>
<lat>-32.1844899</lat>
<lng>21.0103399</lng>
</northeast>
</viewport>
<bounds>
<southwest>
<lat>-34.1172599</lat>
<lng>18.7083299</lng>
</southwest>
<northeast>
<lat>-32.1844899</lat>
<lng>21.0103399</lng>
</northeast>
</bounds>
</geometry>
</result>
<result>
<type>administrative_area_level_1</type>
<type>political</type>
<formatted_address>Western Cape, South Africa</formatted_address>
<address_component>
<long_name>Western Cape</long_name>
<short_name>WC</short_name>
<type>administrative_area_level_1</type>
<type>political</type>
</address_component>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry>
<location>
<lat>-33.2277918</lat>
<lng>21.8568586</lng>
</location>
<location_type>APPROXIMATE</location_type>
<viewport>
<southwest>
<lat>-34.8330538</lat>
<lng>17.7575638</lng>
</southwest>
<northeast>
<lat>-30.4302599</lat>
<lng>24.2224100</lng>
</northeast>
</viewport>
<bounds>
<southwest>
<lat>-34.8330538</lat>
<lng>17.7575638</lng>
</southwest>
<northeast>
<lat>-30.4302599</lat>
<lng>24.2224100</lng>
</northeast>
</bounds>
</geometry>
</result>
<result>
<type>country</type>
<type>political</type>
<formatted_address>South Africa</formatted_address>
<address_component>
<long_name>South Africa</long_name>
<short_name>ZA</short_name>
<type>country</type>
<type>political</type>
</address_component>
<geometry>
<location>
<lat>-30.5594820</lat>
<lng>22.9375060</lng>
</location>
<location_type>APPROXIMATE</location_type>
<viewport>
<southwest>
<lat>-34.9670000</lat>
<lng>16.2817000</lng>
</southwest>
<northeast>
<lat>-22.1253869</lat>
<lng>33.0469000</lng>
</northeast>
</viewport>
<bounds>
<southwest>
<lat>-34.9670000</lat>
<lng>16.2817000</lng>
</southwest>
<northeast>
<lat>-22.1253869</lat>
<lng>33.0469000</lng>
</northeast>
</bounds>
</geometry>
</result>
</GeocodeResponse>
最佳答案
实际上并没有更实用，但是匹配可以稍微清理一下。鉴于您必须查找特定的字符串，并且处理该值的规则取决于字符串，我不确定它可以有多“功能”。
def buildAddress(geocodeResponse: NodeSeq) : Address = {
val addressNodes = geocodeResponse \\ "address_component"
var street = " "
var town = ""
var suburb = ""
var province = ""
var country = ""
var postalCode = ""
addressNodes.foreach {node =>
lazy val text = (node \ "long_name").text // lazy so we don't look until we know it should be there
(node \ "type").head.text match {
case "street_number" => street = text + street
case "route" => street = street + text
case "locality" => town = text
case "sublocality" => suburb = text
case "administrative_area_level_1" => province = text
case "country" => country = text
case "postal_code" => town = text
case _ => // Hmm. Not sure what is expected here.
}
}
Address(street,suburb,town,province,country,postalCode)
}
编辑:
I'm not sure how much more "functional" it can be.
但话又说回来(注意 - 这又是未经测试的，我需要调试 getComponent，但我希望这个想法很清楚。更正可能会在稍后到达)
def buildAddress(geocodeResponse: NodeSeq) : Address = {
val addressNodes = geocodeResponse \\ "address_component"
def getComponent(word:String) = {
addressNodes.find{_ \ "type".head.text == word) match {
case Some(node) => node \ "long_name".text
case _=> ""
}
}
Address(getComponent("street_number")+getComponent("route"),
getComponent("suburb"),
getComponent("town"),
getComponent("province"),
getComponent("country"),
getComponent("postalCode"))
}
关于xml - 更实用的 xml 解析方法，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6424070/
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