spring restTemplate dynamic mapping

Question

I am using spring restTemplate to map a response to a POJO. The response of the rest api is like this:

"attributes": { "name": { "type": "String", "value": ["John Doe"] }, "permanentResidence": { "type": "Boolean", "value": [true] }, "assignments": { "type": "Grid", "value": [{ "id": "AIS002", "startDate": "12012016", "endDate": "23112016" },{ "id": "AIS097", "startDate": "12042017", "endDate": "23092017" }] } }

in the parent class, I have:

public class Users { private Map<String, Attribute> attributes; }

If all the values of were String type, then I could have done like:

public class Attribute { private String type; private String[] value; }

But the values are of different types. So I thought of doing the following:

public class Attribute { private String type; private Object[] value; }

The above should work, but at every step I have to find out what is the type of Object.
So, my question is can I have something like this:

public class Attribute { @JsonProperty("type") private String type; @JsonProperty("value") private String[] stringValues; @JsonProperty("value") private Boolean[] booleanValues; @JsonProperty("value") private Assignments[] assignmentValues; // for Grid type }

But it is not working and throwing errors: Conflicting setter definitions for property "value"

What is the recommended way of handling this scenario?

Manos Nikolaidis · Accepted Answer · 2017-11-14 12:13:21Z

I would recommend Jackson facilities for handling polymorphism here:

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXISTING_PROPERTY, property = "type") @JsonSubTypes({ @JsonSubTypes.Type(value = BooleanAttribute.class, name = "Boolean"), @JsonSubTypes.Type(value = StringAttribute.class, name = "String") }) class Attribute { private String type; } class BooleanAttribute extends Attribute { private Boolean[] value; } class StringAttribute extends Attribute { private String[] value; }

JsonTypeInfo tells Jackson that this is a base class and the type will be determined by a JSON field named "type"

JsonSubTypes maps subtypes of Attribute to values of "type" in JSON.

If you add an appropriate subtype for Assignments and getters/setters Jackson will be able to parse your JSON.

Collectives™ on Stack Overflow

spring restTemplate dynamic mapping

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related