我有两个定义如下的POJO:

public class VertexDefinition {
    private final String name;
    private final Vertex vertex;

    public VertexDefinition(String name, Vertex vertex) {
        this.name = name;
        this.vertex = vertex;
    }

    @JsonProperty("name")
    public String getName() {
        return name;
    }

    @JsonProperty("properties")
    public Iterable<PropertyDefinition> getProperties() {
        if(vertex == null) {
            return Collections.emptySet();
        }
        return Iterables.transform(vertex.getPropertyKeys(), new Function<String, PropertyDefinition>() {
            @Nullable @Override public PropertyDefinition apply(@Nullable String s)  {
                return new PropertyDefinition(vertex, s);
            }
        });
    }

    @JsonProperty("propertyKeys")
    public Iterable<String> getPropertyKeys() {
        if (vertex == null) {
            return Collections.emptySet();
        }
        return vertex.getPropertyKeys();
    }

}

public class PropertyDefinition {

    private final Vertex vertex;
    private final String propertyName;

    public PropertyDefinition(Vertex vertex, String propertyName) {
        this.vertex = vertex;
        this.propertyName = propertyName;
    }

    @JsonProperty("name")
    public String getName() {
        return propertyName;
    }

    @JsonProperty("type")
    public String getType() {
        final Object property = vertex.getProperty(propertyName);

        if (property != null) {
            return property.getClass().getTypeName();
        }

        return "(unknown)";
    }
}


我的Rest方法如下所示:

public Iterable<VertexDefinition> getSchema() {
    .....
}


当我发出请求时,我得到一个json响应,如下所示:

 [
   {
       "name" : "Foo",
       "properties" : [],
       "propertyKeys" : [
          "a",
          "b",
          "c"
       ]
   },
   {
       "name" : "Bar",
       "properties" : [],
       "propertyKeys" : [
          "a",
          "b",
          "c"
       ]
   }
]


简而言之,当填充propertyKeys时,我得到一个返回的空数组,用于属性。

我究竟做错了什么?

最佳答案

我不认为您尝试过将反序列化为可迭代的作品。您可以在getProperties方法中尝试类似的方法吗?

List<PropertyDefinition> propertyDefinitions = Arrays.asList(mapper.readValue(json, PropertyDefinition[].class))

09-11 22:29