jackson array deserilization to properties of singe object java - json

Question

I have a the class structure as below:
#JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type")
#JsonSubTypes({
#JsonSubTypes.Type(name = "testA", value = TestA.class),
#JsonSubTypes.Type(name = "testB", value = TestB.class),
#JsonSubTypes.Type(name = "testC", value = TestC.class)
})
public abstract class Test {
}
public class TestA extends Test {
private String firstName;
private String secondName;
private String surName;
}
public class TestB extends Test {
private String adressLine1;
private String adressLine2;
private String adressLine3;
}
public class TestC extends Test {
private String hobby1;
private String hobby2;
private String hobby3;
}
The above classes are serialized into array of json elements, but when I de-serialise them back, i want the structure as below:
public class FlatStructure {
private TestA testA;
private TestB testB;
private TestC testC;
public void setTestA(TestA testA){
this.testA = testA;
}
public TestA getTestA(){
return testA;
}
.....getter and setter for testB and testC...
}
is it possible to convert the array of elements of type testA, testB and testC to properties of FlatStructure class?

Answer 1

You can add a constructor with the annotation #JsonCreator
, in each class Test
and another one in you flat Structure Class,
after that you use an ObjectMapper to create your class FlatStructure
I would recommend to use the annotaions #JsonProperty also on your constructor
check this link
http://buraktas.com/convert-objects-to-from-json-by-jackson-example/
i think that
public class TestA extends Test {
.....
#JsonCreator
public TestA(#JsonProperty("firstName") String name,
#JsonProperty("secondName") String secondeName,
#JsonProperty("surName") String surName){
this.firstName=name;
this.secondeName=secondeName;
this.surName=surName;
}
... getter, setter .....
}
public class TestB extends Test {
.....
#JsonCreator
public TestB(#JsonProperty("adressLine1") String adressLine1,
#JsonProperty("adressLine2") String adressLine2,
#JsonProperty("adressLine3") String adressLine3){
this.adressLine1=adressLine1;
this.adressLine2=adressLine2;
this.adressLine3=adressLine3;
}
... getter, setter .....
}
public class TestC extends Test {
.....
#JsonCreator
public TestC(#JsonProperty("hobby1") String hobby1,
#JsonProperty("hobby2") String hobby2,
#JsonProperty("hobby3") String hobby3){
this.hobby1=hobby1;
this.hobby2=hobby2;
this.hobby3=hobby3;
}
... getter, setter .....
}
public class FlatStructure{
private TestA testA;
private TestB testB;
private TestC testC;
#JsonCreator
public FlatStructure(#JsonProperty("testA") testA testa,
#JsonProperty("testB") testB testb,
#JsonProperty("testC") testC testc){
this.testA =testa;
this.testB =testb;
this.testC =testc;
}
... getter, setter .....
}
Should work properly with a mapper
Edit:
Custom JSON Deserialization with Jackson
http://www.baeldung.com/jackson-deserialization