ObjectGraphValueSerializersTest.java

/**
 * Copyright (C) 2022 Czech Technical University in Prague
 * <p>
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * <p>
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details. You should have received a copy of the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 */
package cz.cvut.kbss.jsonld.serialization.serializer;

import cz.cvut.kbss.jopa.vocabulary.RDFS;
import cz.cvut.kbss.jsonld.environment.Generator;
import cz.cvut.kbss.jsonld.environment.Vocabulary;
import cz.cvut.kbss.jsonld.environment.model.Employee;
import cz.cvut.kbss.jsonld.environment.model.Organization;
import cz.cvut.kbss.jsonld.serialization.JsonNodeFactory;
import cz.cvut.kbss.jsonld.serialization.context.DummyJsonLdContext;
import cz.cvut.kbss.jsonld.serialization.traversal.ObjectGraphTraverser;
import cz.cvut.kbss.jsonld.serialization.traversal.SerializationContext;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import java.util.Optional;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.instanceOf;
import static org.junit.jupiter.api.Assertions.*;

@ExtendWith(MockitoExtension.class)
class ObjectGraphValueSerializersTest {

    @Mock
    private ObjectGraphTraverser traverser;

    private ObjectGraphValueSerializers sut;

    @BeforeEach
    void setUp() {
        this.sut = new ObjectGraphValueSerializers(new CommonValueSerializers(), traverser);
    }

    @Test
    void getSerializerReturnsObjectPropertySerializerWhenProvidedFieldIsObjectProperty() throws Exception {
        final SerializationContext<Organization> ctx =
                new SerializationContext<>(Vocabulary.IS_MEMBER_OF, Employee.getEmployerField(),
                                           Generator.generateOrganization(), DummyJsonLdContext.INSTANCE);
        final Optional<ValueSerializer<Organization>> result = sut.getSerializer(ctx);
        assertTrue(result.isPresent());
        assertThat(result.get(), instanceOf(ObjectPropertyValueSerializer.class));
    }

    @Test
    void getSerializerReturnsEmptyOptionalWhenFieldIsNotObjectPropertyAndNoCustomSerializerIsRegisteredForIt() throws Exception {
        final SerializationContext<String> ctx =
                new SerializationContext<>(RDFS.LABEL, Organization.class.getDeclaredField("name"), "Test",
                                           DummyJsonLdContext.INSTANCE);
        final Optional<ValueSerializer<String>> result = sut.getSerializer(ctx);
        assertFalse(result.isPresent());
    }

    @Test
    void getSerializerReturnsCustomSerializerWhenItIsRegisteredInCommon() throws Exception {
        final ValueSerializer<Organization> serializer =
                ((value, ctx) -> JsonNodeFactory.createObjectIdNode(Generator.generateUri()));
        sut.registerSerializer(Organization.class, serializer);
        final SerializationContext<Organization> ctx =
                new SerializationContext<>(Vocabulary.IS_MEMBER_OF, Employee.getEmployerField(),
                                           Generator.generateOrganization(), DummyJsonLdContext.INSTANCE);
        final Optional<ValueSerializer<Organization>> result = sut.getSerializer(ctx);
        assertTrue(result.isPresent());
        assertEquals(serializer, result.get());
    }

    @Test
    void getOrDefaultReturnsObjectPropertySerializerWhenProvidedFieldIsObjectProperty() throws Exception {
        final SerializationContext<Organization> ctx =
                new SerializationContext<>(Vocabulary.IS_MEMBER_OF, Employee.getEmployerField(),
                                           Generator.generateOrganization(), DummyJsonLdContext.INSTANCE);
        final ValueSerializer<Organization> result = sut.getOrDefault(ctx);
        assertThat(result, instanceOf(ObjectPropertyValueSerializer.class));
    }

    @Test
    void getOrDefaultReturnsCustomSerializerWhenItIsRegistered() throws Exception {
        final ValueSerializer<Organization> serializer =
                ((value, ctx) -> JsonNodeFactory.createObjectIdNode(Generator.generateUri()));
        sut.registerSerializer(Organization.class, serializer);
        final SerializationContext<Organization> ctx =
                new SerializationContext<>(Vocabulary.IS_MEMBER_OF, Employee.getEmployerField(),
                                           Generator.generateOrganization(), DummyJsonLdContext.INSTANCE);
        final ValueSerializer<Organization> result = sut.getOrDefault(ctx);
        assertEquals(serializer, result);
    }

    @Test
    void getOrDefaultReturnsDefaultSerializerWhenFieldIsNotObjectPropertyAndNoCustomSerializerIsRegisteredForIt() throws Exception {
        final SerializationContext<String> ctx =
                new SerializationContext<>(RDFS.LABEL, Organization.class.getDeclaredField("name"), "Test",
                                           DummyJsonLdContext.INSTANCE);
        final ValueSerializer<String> result = sut.getOrDefault(ctx);
        assertThat(result, instanceOf(DefaultValueSerializer.class));
    }
}