建置增強型文件

代EnhancedDocument表具有複雜結構且具有巢狀屬性的文件類型物件。EnhancedDocument需要符合為指定的主索引鍵屬性的頂層屬性DocumentTableSchema。其餘的內容是任意的，可以由頂層屬性和深層巢狀屬性組成。

您可以使用提供數種方式來加入元素的建置器來建立EnhancedDocument執行個體。

從 JSON 字符串構建

使用 JSON 字符串，您可以構建一EnhancedDocument個方法調用。下面的代碼片段EnhancedDocument從jsonPerson()幫助器方法返回的 JSON 字符串創建一個。此方jsonPerson()法會傳回之前顯示之人物件的 JSON 字串版本。

EnhancedDocument document = 
        EnhancedDocument.builder()
                        .json( jsonPerson() )
                        .build());

從個別元素建置

或者，您可以使用構建器的類型安全方法從單個組件構建EnhancedDocument實例。

下列範例會建立person類似於先前範例中以 JSON 字串建立的增強文件類似的增強文件。

        /* Define the shape of an address map whose JSON representation looks like the following.
           Use 'addressMapEnhancedType' in the following EnhancedDocument.builder() to simplify the code.
           "home": {
             "zipCode": "00000",
             "city": "Any Town",
             "state": "FL",
             "street": "123 Any Street"
           }*/
        EnhancedType<Map<String, String>> addressMapEnhancedType =
                EnhancedType.mapOf(EnhancedType.of(String.class), EnhancedType.of(String.class));


        //  Use the builder's typesafe methods to add elements to the enhanced document.
        EnhancedDocument personDocument = EnhancedDocument.builder()
                .putNumber("id", 50)
                .putString("firstName", "Shirley")
                .putString("lastName", "Rodriguez")
                .putNumber("age", 53)
                .putNull("nullAttribute")
                .putJson("phoneNumbers", phoneNumbersJSONString())
                /* Add the map of addresses whose JSON representation looks like the following.
                        {
                          "home": {
                            "zipCode": "00000",
                            "city": "Any Town",
                            "state": "FL",
                            "street": "123 Any Street"
                          }
                        } */
                .putMap("addresses", getAddresses(), EnhancedType.of(String.class), addressMapEnhancedType)
                .putList("hobbies", List.of("Theater", "Golf"), EnhancedType.of(String.class))
                .build();

輔助方法

    private static String phoneNumbersJSONString() {
        return "  [" +
                "    {" +
                "      \"type\": \"Home\"," +
                "      \"number\": \"555-0140\"" +
                "    }," +
                "    {" +
                "      \"type\": \"Work\"," +
                "      \"number\": \"555-0155\"" +
                "    }" +
                "  ]";
    }

    private static Map<String, Map<String, String>> getAddresses() {
        return Map.of(
                "home", Map.of(
                        "zipCode", "00002",
                        "city", "Any Town",
                        "state", "ME",
                        "street", "123 Any Street"));

    }