[BAEL-6750] - Jackson Polymorphic Deserialization and SubTypes registration using Reflection API (#14503)
* [BAEL-6750] - Jackson Polymorphic Deserialization and SubTypes registration using Reflection API * Renamed test files --------- Co-authored-by: ovidiu-mihai98 <57233636+ovidiu-mihai98@users.noreply.github.com>
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>jackson-polymorphic-deserialization</artifactId>
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<name>jackson-polymorphic-deserialization</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>jackson-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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<version>${jackson-core.version}</version>
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</dependency>
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<dependency>
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<groupId>org.reflections</groupId>
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<artifactId>reflections</artifactId>
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<version>${reflections.version}</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>jackson-polymorphic-deserialization</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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</build>
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<properties>
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<jackson-core.version>2.15.2</jackson-core.version>
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<reflections.version>0.9.11</reflections.version>
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</properties>
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</project>
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package com.baeldung.jackson.polymorphic.deserialization.reflection;
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import com.fasterxml.jackson.annotation.JsonTypeInfo;
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@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXISTING_PROPERTY, property = "type", visible = true)
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public class Vehicle {
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public String type;
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public String getType() {
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return type;
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}
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public void setType(String type) {
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this.type = type;
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}
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@VehicleSubType("ELECTRIC_VEHICLE")
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public static class ElectricVehicle extends Vehicle {
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String autonomy;
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String chargingTime;
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public String getAutonomy() {
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return autonomy;
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}
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public void setAutonomy(String autonomy) {
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this.autonomy = autonomy;
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}
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public String getChargingTime() {
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return chargingTime;
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}
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public void setChargingTime(String chargingTime) {
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this.chargingTime = chargingTime;
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}
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}
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@VehicleSubType("FUEL_VEHICLE")
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public static class FuelVehicle extends Vehicle {
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String fuelType;
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String transmissionType;
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}
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}
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package com.baeldung.jackson.polymorphic.deserialization.reflection;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Retention(RetentionPolicy.RUNTIME)
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@Target(ElementType.TYPE)
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public @interface VehicleSubType {
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String value();
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}
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package com.baeldung.jackson.polymorphic.deserialization.typeHandlingAnnotations;
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import com.fasterxml.jackson.annotation.JsonSubTypes;
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import com.fasterxml.jackson.annotation.JsonTypeInfo;
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@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXISTING_PROPERTY, property = "type", visible = true)
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@JsonSubTypes({
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@JsonSubTypes.Type(value = Vehicle.ElectricVehicle.class, name = "ELECTRIC_VEHICLE"),
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@JsonSubTypes.Type(value = Vehicle.FuelVehicle.class, name = "FUEL_VEHICLE")
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})
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public class Vehicle {
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public String type;
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public String getType() {
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return type;
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}
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public void setType(String type) {
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this.type = type;
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}
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public static class ElectricVehicle extends Vehicle {
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String autonomy;
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String chargingTime;
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public String getAutonomy() {
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return autonomy;
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}
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public void setAutonomy(String autonomy) {
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this.autonomy = autonomy;
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}
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public String getChargingTime() {
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return chargingTime;
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}
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public void setChargingTime(String chargingTime) {
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this.chargingTime = chargingTime;
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}
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}
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public static class FuelVehicle extends Vehicle {
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String fuelType;
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String transmissionType;
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public String getFuelType() {
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return fuelType;
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}
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public void setFuelType(String fuelType) {
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this.fuelType = fuelType;
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}
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public String getTransmissionType() {
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return transmissionType;
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}
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public void setTransmissionType(String transmissionType) {
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this.transmissionType = transmissionType;
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}
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}
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}
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package com.baeldung.jackson.polymorphic.deserialization.reflection;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import java.util.Set;
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import org.junit.jupiter.api.Test;
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import org.reflections.Reflections;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.jsontype.NamedType;
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public class ReflectionUnitTest {
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@Test
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public void whenDeserializingPolymorphic_thenCorrect() throws JsonProcessingException {
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String json = "{\"type\":\"ELECTRIC_VEHICLE\",\"autonomy\":\"500\",\"chargingTime\":\"200\"}";
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ObjectMapper objectMapper = getCustomObjectMapper();
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Vehicle vehicle = objectMapper.readValue(json, Vehicle.class);
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assertEquals(Vehicle.ElectricVehicle.class, vehicle.getClass());
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}
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private ObjectMapper getCustomObjectMapper() {
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ObjectMapper objectMapper = new ObjectMapper();
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Reflections reflections = new Reflections("com.baeldung.jackson.polymorphic.deserialization.reflection");
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Set<Class<?>> subtypes = reflections.getTypesAnnotatedWith(VehicleSubType.class);
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for (Class<?> subType : subtypes) {
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VehicleSubType annotation = subType.getAnnotation(VehicleSubType.class);
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if (annotation != null) {
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String typeName = annotation.value();
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objectMapper.registerSubtypes(new NamedType(subType, typeName));
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}
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}
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return objectMapper;
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}
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}
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package com.baeldung.jackson.polymorphic.deserialization.typeHandlingAnnotations;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import org.junit.jupiter.api.Test;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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public class TypeHandlingAnnotationsUnitTest {
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@Test
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public void whenDeserializingPolymorphic_thenCorrect() throws JsonProcessingException {
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String json = "{\"type\":\"ELECTRIC_VEHICLE\",\"autonomy\":\"500\",\"chargingTime\":\"200\"}";
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Vehicle vehicle = new ObjectMapper().readerFor(Vehicle.class).readValue(json);
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assertEquals(Vehicle.ElectricVehicle.class, vehicle.getClass());
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}
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}
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<module>jackson-custom-conversions</module>
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<module>jackson-exceptions</module>
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<module>jackson-jr</module>
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<module>jackson-polymorphic-deserialization</module>
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</modules>
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<dependencies>
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