CreatorNullPrimitives2977Test.java

package tools.jackson.databind.deser.creators;

import org.junit.jupiter.api.Test;

import com.fasterxml.jackson.annotation.JsonProperty;

import tools.jackson.databind.*;
import tools.jackson.databind.cfg.ConstructorDetector;
import tools.jackson.databind.cfg.MapperConfig;
import tools.jackson.databind.introspect.AnnotatedMember;
import tools.jackson.databind.introspect.AnnotatedParameter;
import tools.jackson.databind.introspect.JacksonAnnotationIntrospector;
import tools.jackson.databind.testutil.DatabindTestUtil;

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

class CreatorNullPrimitives2977Test extends DatabindTestUtil {
    @SuppressWarnings("serial")
    static class ABCParamIntrospector extends JacksonAnnotationIntrospector {
        @Override
        public String findImplicitPropertyName(MapperConfig<?> config, AnnotatedMember param) {
            if (param instanceof AnnotatedParameter ap) {
                switch (ap.getIndex()) {
                    case 0:
                        return "a";
                    case 1:
                        return "b";
                    case 2:
                        return "c";
                    default:
                        return "param" + ap.getIndex();
                }
            }
            return super.findImplicitPropertyName(config, param);
        }
    }

    static class TestClass2977 {
        @JsonProperty("aa")
        final int a;

        // work-around: add JsonProperty on parameter name, or JsonCreator
//        @com.fasterxml.jackson.annotation.JsonCreator
        public TestClass2977(int a) {
            this.a = a;
        }
    }

    // [databind#2977]
    @Test
    void defaultingWithNull2977() throws Exception {
        ObjectMapper mapper = jsonMapperBuilder()
                .enable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES)
                .annotationIntrospector(new ABCParamIntrospector())
                .constructorDetector(ConstructorDetector.USE_PROPERTIES_BASED)
                .build();
        TestClass2977 result = mapper.readValue(a2q("{'aa': 8}"), TestClass2977.class);
        assertEquals(8, result.a);
    }
}