diff --git a/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Employee.java b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Employee.java new file mode 100644 index 0000000000..44b10ee39b --- /dev/null +++ b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Employee.java @@ -0,0 +1,24 @@ +package com.baeldung.jackson.deserialization.immutable; + +import com.fasterxml.jackson.annotation.JsonCreator; +import com.fasterxml.jackson.annotation.JsonProperty; + +public class Employee { + + private final long id; + private final String name; + + @JsonCreator(mode = JsonCreator.Mode.PROPERTIES) + public Employee(@JsonProperty("id") long id, @JsonProperty("name") String name) { + this.id = id; + this.name = name; + } + + public long getId() { + return id; + } + + public String getName() { + return name; + } +} diff --git a/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Person.java b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Person.java new file mode 100644 index 0000000000..d9041720b6 --- /dev/null +++ b/jackson/src/main/java/com/baeldung/jackson/deserialization/immutable/Person.java @@ -0,0 +1,44 @@ +package com.baeldung.jackson.deserialization.immutable; + +import com.fasterxml.jackson.databind.annotation.JsonDeserialize; +import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder; + +@JsonDeserialize(builder = Person.Builder.class) +public class Person { + + private final String name; + private final Integer age; + + private Person(String name, Integer age) { + this.name = name; + this.age = age; + } + + public String getName() { + return name; + } + + public Integer getAge() { + return age; + } + + @JsonPOJOBuilder + static class Builder { + String name; + Integer age; + + Builder withName(String name) { + this.name = name; + return this; + } + + Builder withAge(Integer age) { + this.age = age; + return this; + } + + Person build() { + return new Person(name, age); + } + } +} diff --git a/jackson/src/test/java/com/baeldung/jackson/deserialization/immutable/ImmutableObjectDeserializationUnitTest.java b/jackson/src/test/java/com/baeldung/jackson/deserialization/immutable/ImmutableObjectDeserializationUnitTest.java new file mode 100644 index 0000000000..1252179e3a --- /dev/null +++ b/jackson/src/test/java/com/baeldung/jackson/deserialization/immutable/ImmutableObjectDeserializationUnitTest.java @@ -0,0 +1,38 @@ +package com.baeldung.jackson.deserialization.immutable; + +import com.fasterxml.jackson.databind.ObjectMapper; +import org.junit.Test; + +import java.io.IOException; + +import static org.junit.Assert.*; + +public class ImmutableObjectDeserializationUnitTest { + + @Test + public void whenPublicConstructorIsUsed_thenObjectIsDeserialized() throws IOException { + final String json = "{\"name\":\"Frank\",\"id\":5000}"; + Employee employee = new ObjectMapper().readValue(json, Employee.class); + + assertEquals("Frank", employee.getName()); + assertEquals(5000, employee.getId()); + } + + @Test + public void whenBuilderIsUsedAndFieldIsNull_thenObjectIsDeserialized() throws IOException { + final String json = "{\"name\":\"Frank\"}"; + Person person = new ObjectMapper().readValue(json, Person.class); + + assertEquals("Frank", person.getName()); + assertNull(person.getAge()); + } + + @Test + public void whenBuilderIsUsedAndAllFieldsPresent_thenObjectIsDeserialized() throws IOException { + final String json = "{\"name\":\"Frank\",\"age\":50}"; + Person person = new ObjectMapper().readValue(json, Person.class); + + assertEquals("Frank", person.getName()); + assertEquals(50, (int) person.getAge()); + } +}