定数ディレクティブの使用

この DataWeave の例では、DataWeave ヘッダーで変数 (​var​) として定義された定数から URL をビルドします。また、入力に存在する項目を条件付きで出力します。 開始する前に、DataWeave 2.0 (%dw 2.0​) は Mule 4 アプリケーションを対象とすることに注意してください。Mule 3 アプリケーションの場合、Mule 3.9 ドキュメントセットの DataWeave 1.0 (%dw 1.0​) の例を参照してください。他の Mule バージョンの場合は、目次の Mule Runtime バージョンセレクタを使用できます。

この例では、次の関数を使用します。

  • 定数ディレクティブを URL にビルドする ​++​ (連結)。

  • 入力の項目を調べる ​map​。

  • summary​ および ​brand​ 項目を出力する ​if​。

DataWeave スクリプト:
%dw 2.0
var baseUrl = "http://alainn-cosmetics.cloudhub.io/api/v1.0"
var urlPage = "http://alainn-cosmetics.cloudhub.io/api/v1.0/items"
var fullUrl = "http://alainn-cosmetics.cloudhub.io/api/v1.0/items"
var pageIndex = 0
var requestedPageSize = 4
output application/json
---
using (pageSize = payload.getItemsResponse.PageInfo.pageSize) {
     links: [
        {
            href: fullUrl,
            rel : "self"
        },
        {
            href: urlPage ++ "?pageIndex=" ++ (pageIndex + pageSize) ++ "&pageSize=" ++ requestedPageSize,
            rel: "next"
        },
        ({
            href: urlPage ++ "?pageIndex=" ++ (pageIndex - pageSize) ++ "&pageSize=" ++ requestedPageSize,
            rel: "prev"
        }) if(pageIndex > 0)
     ],
     collection: {
        size: pageSize,
        items: payload.getItemsResponse.*Item map (item) -> {
            id: item.id,
            'type': item.'type',
            name: item.name,
            (summary: item.summary) if(item.summary?),
            (brand: item.brand) if(item.brand?),
            links: (item.images.*image map (image) -> {
                href: trim(image),
                rel: image.@'type'
            }) + {
                href: baseUrl ++ "/" ++ item.id,
                rel: "self"
            }
        }
     }
}
入力 XML ペイロード:
<ns0:getItemsResponse xmlns:ns0="http://www.alainn.com/SOA/message/1.0">
    <ns0:PageInfo>
        <pageIndex>0</pageIndex>
        <pageSize>5</pageSize>
    </ns0:PageInfo>
    <ns1:Item xmlns:ns1="http://www.alainn.com/SOA/model/1.0">
        <id>B0015BYNRO</id>
        <type>Oils</type>
        <name>Now Foods LANOLIN PURE</name>
        <images>
            <image type="SwatchImage">http://ecx.images-amazon.com/images/I/11Qoe774Q4L._SL30_.jpg
            </image>
        </images>
    </ns1:Item>
    <ns1:Item xmlns:ns1="http://www.alainn.com/SOA/model/1.0">
        <id>B002K8AD02</id>
        <type>Bubble Bath</type>
        <name>Deep Steep Honey Bubble Bath</name>
        <summary>Disclaimer: This website is for informational purposes only.
            Always check the actual product label in your possession for the most
            accurate ingredient information due to product changes or upgrades
            that may not yet be reflected on our web site. These statements made
            in this website have not been evaluated by the Food and Drug
            Administration. The products offered are not intended to diagnose,
            treat
        </summary>
        <images>
            <image type="SwatchImage">http://ecx.images-amazon.com/images/I/216ytnMOeXL._SL30_.jpg
            </image>
        </images>
    </ns1:Item>
    <ns1:Item xmlns:ns1="http://www.alainn.com/SOA/model/1.0">
        <id>B000I206JK</id>
        <type>Oils</type>
        <name>Now Foods Castor Oil</name>
        <summary>One of the finest natural skin emollients available</summary>
        <images>
            <image type="SwatchImage">http://ecx.images-amazon.com/images/I/21Yz8q-yQoL._SL30_.jpg
            </image>
        </images>
    </ns1:Item>
    <ns1:Item xmlns:ns1="http://www.alainn.com/SOA/model/1.0">
        <id>B003Y5XF2S</id>
        <type>Chemical Hair Dyes</type>
        <name>Manic Panic Semi-Permanent Color Cream</name>
        <summary>Ready to use, no mixing required</summary>
        <images>
            <image type="SwatchImage">http://ecx.images-amazon.com/images/I/51A2FuX27dL._SL30_.jpg
            </image>
        </images>
    </ns1:Item>
    <ns1:Item xmlns:ns1="http://www.alainn.com/SOA/model/1.0">
        <id>B0016BELU2</id>
        <type>Chemical Hair Dyes</type>
        <name>Herbatint Herbatint Permanent Chestnut (4n)</name>
        <images>
            <image type="SwatchImage">http://ecx.images-amazon.com/images/I/21woUiM0BdL._SL30_.jpg
            </image>
        </images>
    </ns1:Item>
</ns0:getItemsResponse>
出力 JSON:
{
  "links": [
    {
      "href": "http://alainn-cosmetics.cloudhub.io/api/v1.0/items",
      "rel": "self"
    },
    {
      "href": "http://alainn-cosmetics.cloudhub.io/api/v1.0/items?pageIndex=5&pageSize=4",
      "rel": "next"
    }
  ],
  "collection": {
    "size": "5",
    "items": [
      {
        "id": "B0015BYNRO",
        "type": "Oils",
        "name": "Now Foods LANOLIN PURE",
        "links": [
          {
            "href": "http://ecx.images-amazon.com/images/I/11Qoe774Q4L._SL30_.jpg",
            "rel": "SwatchImage"
          },
          {
            "href": "http://alainn-cosmetics.cloudhub.io/api/v1.0/B0015BYNRO",
            "rel": "self"
          }
        ]
      },
      {
        "id": "B002K8AD02",
        "type": "Bubble Bath",
        "name": "Deep Steep Honey Bubble Bath",
        "summary": "Disclaimer: This website is for informational purposes only.\n            Always check the actual product label in your possession for the most\n            accurate ingredient information due to product changes or upgrades\n            that may not yet be reflected on our web site. These statements made\n            in this website have not been evaluated by the Food and Drug\n            Administration. The products offered are not intended to diagnose,\n            treat\n        ",
        "links": [
          {
            "href": "http://ecx.images-amazon.com/images/I/216ytnMOeXL._SL30_.jpg",
            "rel": "SwatchImage"
          },
          {
            "href": "http://alainn-cosmetics.cloudhub.io/api/v1.0/B002K8AD02",
            "rel": "self"
          }
        ]
      },
      {
        "id": "B000I206JK",
        "type": "Oils",
        "name": "Now Foods Castor Oil",
        "summary": "One of the finest natural skin emollients available",
        "links": [
          {
            "href": "http://ecx.images-amazon.com/images/I/21Yz8q-yQoL._SL30_.jpg",
            "rel": "SwatchImage"
          },
          {
            "href": "http://alainn-cosmetics.cloudhub.io/api/v1.0/B000I206JK",
            "rel": "self"
          }
        ]
      },
      {
        "id": "B003Y5XF2S",
        "type": "Chemical Hair Dyes",
        "name": "Manic Panic Semi-Permanent Color Cream",
        "summary": "Ready to use, no mixing required",
        "links": [
          {
            "href": "http://ecx.images-amazon.com/images/I/51A2FuX27dL._SL30_.jpg",
            "rel": "SwatchImage"
          },
          {
            "href": "http://alainn-cosmetics.cloudhub.io/api/v1.0/B003Y5XF2S",
            "rel": "self"
          }
        ]
      },
      {
        "id": "B0016BELU2",
        "type": "Chemical Hair Dyes",
        "name": "Herbatint Herbatint Permanent Chestnut (4n)",
        "links": [
          {
            "href": "http://ecx.images-amazon.com/images/I/21woUiM0BdL._SL30_.jpg",
            "rel": "SwatchImage"
          },
          {
            "href": "http://alainn-cosmetics.cloudhub.io/api/v1.0/B0016BELU2",
            "rel": "self"
          }
        ]
      }
    ]
  }
}

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