Converting nested fields of JSON into java objects

Question

Following is my class

class Feed {
    Long id;
    String title;
    String text;
    Short type;
    Object object;
}

Feed.object can be of any type based on Feed.type. When I upload the document of the class into elasticsearch every thing works fine, however, when the document is fetched back then org.codehaus.jackson.map.ObjectMapper converts Feed.object in LinkedHashMap. Is there a way to get the actual object? The JSON string I get is of Feed.

Following is the conversion:

Feed feed = mapper.readValue(response.getHits().getHits()[0].getSourceAsString(), Feed.class);

Wilson · Accepted Answer · 2016-06-26 06:37:17Z

1

You can use @JsonTypeInfo to indicate what is the class of object according to the value of type in Feed class. For example,

class Feed {
    Long id;
    String title;
    String text;
    Short type;
    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXTERNAL_POPERTY, propery = "type")
    @JsonSubTypes({
        @JsonSubTypes.Type(value = Foo.class, name = "1"),
        @JsonSubTypes.Type(value = Bar.class, name = "2")
    })
    Object object;
}

answered Jun 26, 2016 at 6:37

Wilson

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