TestWithGenerics.java

package tools.jackson.databind.jsontype;

import java.util.*;

import org.junit.jupiter.api.Test;

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.annotation.JsonSubTypes.Type;
import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.annotation.JsonTypeInfo.Id;

import tools.jackson.core.*;
import tools.jackson.databind.*;
import tools.jackson.databind.testutil.DatabindTestUtil;
import tools.jackson.databind.testutil.NoCheckSubTypeValidator;

import static org.junit.jupiter.api.Assertions.*;

public class TestWithGenerics extends DatabindTestUtil
{
    @JsonTypeInfo(use = Id.NAME, include = As.PROPERTY, property = "object-type")
    @JsonSubTypes( { @Type(value = Dog.class, name = "doggy") })
    static abstract class Animal {
        public String name;
    }

    static class Dog extends Animal {
        public int boneCount;

        public Dog(String name, int b) {
            super();
            this.name = name;
            boneCount = b;
        }
    }

    static class ContainerWithGetter<T extends Animal> {
        private T animal;

        public ContainerWithGetter(T a) { animal = a; }

        public T getAnimal() { return animal; }
    }

    static class ContainerWithField<T extends Animal> {
        public T animal;

        public ContainerWithField(T a) { animal = a; }
    }

    static class WrappedContainerWithField {
        public ContainerWithField<?> animalContainer;
    }

	// Beans for [JACKSON-387], [JACKSON-430]

    @JsonTypeInfo(use=JsonTypeInfo.Id.CLASS, include=JsonTypeInfo.As.PROPERTY, property="@classAttr1")
    static class MyClass {
        public List<MyParam<?>> params = new ArrayList<MyParam<?>>();
    }

    @JsonTypeInfo(use=JsonTypeInfo.Id.CLASS, include=JsonTypeInfo.As.PROPERTY, property="@classAttr2")
    static class MyParam<T>{
        public T value;

        public MyParam() { }
        public MyParam(T v) { value = v; }
    }

    static class SomeObject {
        public String someValue = UUID.randomUUID().toString();
    }

    static class CustomValueSerializer extends ValueSerializer<Object>
    {
        private final ValueSerializer<Object> beanSerializer;

        public CustomValueSerializer( ValueSerializer<Object> beanSerializer ) { this.beanSerializer = beanSerializer; }

        @Override
        public void serialize( Object value, JsonGenerator g, SerializationContext provider )
        {
            beanSerializer.serialize(value, g, provider);
        }

        @Override
        public Class<?> handledType() { return beanSerializer.handledType(); }

        @Override
        public void serializeWithType( Object value, JsonGenerator g, SerializationContext provider, TypeSerializer typeSer )
        {
            beanSerializer.serializeWithType(value, g, provider, typeSer);
        }

        @Override
        public void resolve(SerializationContext provider)
        {
            beanSerializer.resolve(provider);
        }
    }

    // [databind#543]
    static class ContainerWithTwoAnimals<U extends Animal,V extends Animal> extends ContainerWithField<U> {
         public V otherAnimal;

         public ContainerWithTwoAnimals(U a1, V a2) {
              super(a1);
              otherAnimal = a2;
         }
    }

    /*
    /**********************************************************
    /* Unit tests
    /**********************************************************
     */

    private final ObjectMapper MAPPER = newJsonMapper();

    @Test
    public void testWrapperWithGetter() throws Exception
    {
        Dog dog = new Dog("Fluffy", 3);
        String json = MAPPER.writeValueAsString(new ContainerWithGetter<Animal>(dog));
        if (json.indexOf("\"object-type\":\"doggy\"") < 0) {
            fail("polymorphic type not kept, result == "+json+"; should contain 'object-type':'...'");
        }
    }

    @Test
    public void testWrapperWithField() throws Exception
    {
        Dog dog = new Dog("Fluffy", 3);
        String json = MAPPER.writeValueAsString(new ContainerWithField<Animal>(dog));
        if (json.indexOf("\"object-type\":\"doggy\"") < 0) {
            fail("polymorphic type not kept, result == "+json+"; should contain 'object-type':'...'");
        }
    }

    @Test
    public void testWrapperWithExplicitType() throws Exception
    {
        Dog dog = new Dog("Fluffy", 3);
        ContainerWithGetter<Animal> c2 = new ContainerWithGetter<Animal>(dog);
        String json = MAPPER.writerFor(MAPPER.getTypeFactory().constructParametricType(ContainerWithGetter.class,
                Animal.class)).writeValueAsString(c2);
        if (json.indexOf("\"object-type\":\"doggy\"") < 0) {
            fail("polymorphic type not kept, result == "+json+"; should contain 'object-type':'...'");
        }
    }

    @Test
    public void testJackson387() throws Exception
    {
        ObjectMapper om = jsonMapperBuilder()
                .enable( SerializationFeature.INDENT_OUTPUT)
                .activateDefaultTyping(NoCheckSubTypeValidator.instance,
                        DefaultTyping.JAVA_LANG_OBJECT, JsonTypeInfo.As.PROPERTY)
                .changeDefaultPropertyInclusion(incl -> incl.withValueInclusion(JsonInclude.Include.NON_NULL))
                .build();

        MyClass mc = new MyClass();

        MyParam<Integer> moc1 = new MyParam<Integer>(1);
        MyParam<String> moc2 = new MyParam<String>("valueX");

        SomeObject so = new SomeObject();
        so.someValue = "xxxxxx";
        MyParam<SomeObject> moc3 = new MyParam<SomeObject>(so);

        List<SomeObject> colist = new ArrayList<SomeObject>();
        colist.add( new SomeObject() );
        colist.add( new SomeObject() );
        colist.add( new SomeObject() );
        MyParam<List<SomeObject>> moc4 = new MyParam<List<SomeObject>>(colist);

        mc.params.add( moc1 );
        mc.params.add( moc2 );
        mc.params.add( moc3 );
        mc.params.add( moc4 );

        String json = om.writeValueAsString( mc );

        MyClass mc2 = om.readValue(json, MyClass.class );
        assertNotNull(mc2);
        assertNotNull(mc2.params);
        assertEquals(4, mc2.params.size());
    }

    // [databind#543]
    @Test
    public void testValueWithMoreGenericParameters() throws Exception
    {
        WrappedContainerWithField wrappedContainerWithField = new WrappedContainerWithField();
        wrappedContainerWithField.animalContainer = new ContainerWithTwoAnimals<Dog,Dog>(new Dog("d1",1), new Dog("d2",2));
        String json = MAPPER.writeValueAsString(wrappedContainerWithField);
        assertNotNull(json);
    }
}