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更多功能的xml解析方法

发布时间：2020-12-16 23:19:50 所属栏目：百科 来源：网络整理
导读：我正在将一些xml映射到一个案例类,它工作正常,但我感觉我的命令性的眼罩让我眼花缭乱,找到了更好的功能解决方案.任何人都可以建议一个比这更好的方法： def buildAddress(geocodeResponse: NodeSeq) : Address = { val addressNodes = geocodeResponse "a
我正在将一些xml映射到一个案例类,它工作正常,但我感觉我的命令性的眼罩让我眼花缭乱,找到了更好的功能解决方案.任何人都可以建议一个比这更好的方法： 

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)
}

在这种情况下,使用Dispatch从Google地理编码API中检索xml.

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>

解决方法

除非你得到某种反思,否则你真的没有太多可以让它变得更好.看起来你可以改善你的属性匹配,做这样的事情,以帮助它的纯粹苦差事： 

def buildAddress(geocodeResponse: NodeSeq) : Address = {
    def getComponent(component: String): String = {
        val longNames = for {
            addressComponent <- geocodeResponse  "address_component"
            componentType <- addressComponent  "type"
            if componentType.text == component
        } yield addressComponent  "long_name"
        longNames.head.text
    }
    implicit def toC(s: String) = new { def c = getComponent(s) }
    implicit val map = Map(
        'street -> ("route".c + "street_number".c),'town -> "locality".c,'suburb -> "sublocality".c,'province -> "administrative_area_level_1".c,'country -> "country".c,'postalCode -> "postal_code".c
    )
    Address('street,'suburb,'town,'province,'country,'postalCode)
}

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