[#43] Add utility to list all entities registered with DynamicRelations

dynamic-relations/src/main/java/at/drm/util/DynamicRelationsUtils.java

@@ -0,0 +1,52 @@
+package at.drm.util;
+
+import at.drm.dao.RelationDao;
+import at.drm.factory.RelationDaoFactory;
+import lombok.RequiredArgsConstructor;
+import org.springframework.core.ResolvableType;
+import org.springframework.stereotype.Component;
+import java.lang.reflect.Field;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@Component
+@RequiredArgsConstructor
+public class DynamicRelationsUtils {
+
+    private final RelationDaoFactory relationDaoFactory;
+
+    public List<Class<?>> listRegisteredEntities() {
+        Set<RelationDao> allDaos = relationDaoFactory.getAllDaos();
+
+        return allDaos.stream()
+            .map(this::extractEntityClassFromDao)
+            .distinct()
+            .collect(Collectors.toList());
+    }
+
+    private Class<?> extractEntityClassFromDao(RelationDao relationDao) {
+        try {
+            ResolvableType resolvableType = ResolvableType.forClass(relationDao.getClass()).as(RelationDao.class);
+            ResolvableType generic = resolvableType.getGeneric(0);
+            Class<?> relationLinkClass = getRelationLinkClass(generic);
+
+            Field sourceObjectField = relationLinkClass.getDeclaredField("sourceObject");
+            return sourceObjectField.getType();
+        } catch (NoSuchFieldException e) {
+            throw new RuntimeException(
+                "Could not find sourceObject field in RelationLink class for DAO: " + relationDao.getClass(), e
+            );
+        }
+    }
+
+    private Class<?> getRelationLinkClass(ResolvableType generic) {
+        Class<?> relationLinkClass = generic.resolve();
+
+        if (relationLinkClass == null) {
+            throw new RuntimeException("Could not resolve RelationLink class for type: " + generic.getClass());
+        }
+
+        return relationLinkClass;
+    }
+}

dynamic-relations/src/test/java/at/drm/testutil/daos/AnotherTestEntityRelationDao.java

@@ -0,0 +1,6 @@
+package at.drm.testutil.daos;
+
+import at.drm.dao.RelationDao;
+import at.drm.testutil.relations.AnotherTestEntityRelationLink;
+
+public abstract class AnotherTestEntityRelationDao implements RelationDao<AnotherTestEntityRelationLink, Long> { }

dynamic-relations/src/test/java/at/drm/testutil/daos/InvalidRelationDao.java

@@ -0,0 +1,6 @@
+package at.drm.testutil.daos;
+
+import at.drm.dao.RelationDao;
+import at.drm.testutil.relations.InvalidRelationLink;
+
+public abstract class InvalidRelationDao implements RelationDao<InvalidRelationLink, Long> { }

dynamic-relations/src/test/java/at/drm/testutil/daos/TestEntityRelationDao.java

@@ -0,0 +1,6 @@
+package at.drm.testutil.daos;
+
+import at.drm.dao.RelationDao;
+import at.drm.testutil.relations.TestEntityRelationLink;
+
+public abstract class TestEntityRelationDao implements RelationDao<TestEntityRelationLink, Long> { }

dynamic-relations/src/test/java/at/drm/testutil/entities/AnotherTestEntity.java

@@ -0,0 +1,17 @@
+package at.drm.testutil.entities;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+
+@Data
+@AllArgsConstructor
+@EqualsAndHashCode(onlyExplicitlyIncluded = true)
+@ToString(onlyExplicitlyIncluded = true)
+public class AnotherTestEntity {
+
+    @EqualsAndHashCode.Include
+    @ToString.Include
+    private Long id;
+}

dynamic-relations/src/test/java/at/drm/testutil/entities/SomeTestEntity.java

@@ -0,0 +1,17 @@
+package at.drm.testutil.entities;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+
+@Data
+@AllArgsConstructor
+@EqualsAndHashCode(onlyExplicitlyIncluded = true)
+@ToString(onlyExplicitlyIncluded = true)
+public class SomeTestEntity {
+
+    @EqualsAndHashCode.Include
+    @ToString.Include
+    private Long id;
+}

dynamic-relations/src/test/java/at/drm/testutil/relations/AnotherTestEntityRelationLink.java

@@ -0,0 +1,16 @@
+package at.drm.testutil.relations;
+
+import at.drm.model.RelationLink;
+import at.drm.testutil.entities.AnotherTestEntity;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class AnotherTestEntityRelationLink implements RelationLink<AnotherTestEntity> {
+    private AnotherTestEntity sourceObject;
+    private Long targetId;
+    private String targetType;
+}

dynamic-relations/src/test/java/at/drm/testutil/relations/InvalidRelationLink.java

@@ -0,0 +1,26 @@
+package at.drm.testutil.relations;
+
+import at.drm.model.RelationLink;
+import at.drm.testutil.entities.SomeTestEntity;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class InvalidRelationLink implements RelationLink<SomeTestEntity> {
+    private SomeTestEntity wrongFieldName;
+    private Long targetId;
+    private String targetType;
+
+    @Override
+    public SomeTestEntity getSourceObject() {
+        return wrongFieldName;
+    }
+
+    @Override
+    public void setSourceObject(SomeTestEntity sourceObject) {
+        this.wrongFieldName = sourceObject;
+    }
+}

dynamic-relations/src/test/java/at/drm/testutil/relations/TestEntityRelationLink.java

@@ -0,0 +1,16 @@
+package at.drm.testutil.relations;
+
+import at.drm.model.RelationLink;
+import at.drm.testutil.entities.SomeTestEntity;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class TestEntityRelationLink implements RelationLink<SomeTestEntity> {
+    private SomeTestEntity sourceObject;
+    private Long targetId;
+    private String targetType;
+}

dynamic-relations/src/test/java/at/drm/util/DynamicRelationsUtilsTest.java

@@ -0,0 +1,131 @@
+package at.drm.util;
+
+import at.drm.factory.RelationDaoFactory;
+import at.drm.testutil.daos.AnotherTestEntityRelationDao;
+import at.drm.testutil.daos.InvalidRelationDao;
+import at.drm.testutil.daos.TestEntityRelationDao;
+import at.drm.testutil.entities.AnotherTestEntity;
+import at.drm.testutil.entities.SomeTestEntity;
+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.List;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class DynamicRelationsUtilsTest {
+
+    @Mock
+    private RelationDaoFactory relationDaoFactory;
+
+    private DynamicRelationsUtils dynamicRelationsUtils;
+
+    @BeforeEach
+    void setUp() {
+        dynamicRelationsUtils = new DynamicRelationsUtils(relationDaoFactory);
+    }
+
+    @Test
+    void testListRegisteredEntities_WithMultipleDaos_ShouldReturnDistinctEntityClasses() {
+        TestEntityRelationDao dao1 = mock(TestEntityRelationDao.class);
+        AnotherTestEntityRelationDao dao2 = mock(AnotherTestEntityRelationDao.class);
+
+        when(relationDaoFactory.getAllDaos()).thenReturn(Set.of(dao1, dao2));
+
+        List<Class<?>> result = dynamicRelationsUtils.listRegisteredEntities();
+
+        assertNotNull(result);
+        assertEquals(2, result.size());
+        assertTrue(result.contains(SomeTestEntity.class));
+        assertTrue(result.contains(AnotherTestEntity.class));
+        verify(relationDaoFactory, times(1)).getAllDaos();
+    }
+
+    @Test
+    void testListRegisteredEntities_WithDuplicateEntityTypes_ShouldReturnDistinctClasses() {
+        TestEntityRelationDao dao1 = mock(TestEntityRelationDao.class);
+        TestEntityRelationDao dao2 = mock(TestEntityRelationDao.class);
+
+        when(relationDaoFactory.getAllDaos()).thenReturn(Set.of(dao1, dao2));
+
+        List<Class<?>> result = dynamicRelationsUtils.listRegisteredEntities();
+
+        assertNotNull(result);
+        assertEquals(1, result.size());
+        assertEquals(SomeTestEntity.class, result.getFirst());
+        verify(relationDaoFactory, times(1)).getAllDaos();
+    }
+
+    @Test
+    void testListRegisteredEntities_WithEmptyDaoSet_ShouldReturnEmptyList() {
+        when(relationDaoFactory.getAllDaos()).thenReturn(Set.of());
+
+        List<Class<?>> result = dynamicRelationsUtils.listRegisteredEntities();
+
+        assertNotNull(result);
+        assertTrue(result.isEmpty());
+        verify(relationDaoFactory, times(1)).getAllDaos();
+    }
+
+    @Test
+    void testExtractEntityClassFromDao_WithValidDao_ShouldReturnCorrectEntityClass() {
+        TestEntityRelationDao dao = mock(TestEntityRelationDao.class);
+        when(relationDaoFactory.getAllDaos()).thenReturn(Set.of(dao));
+
+        List<Class<?>> result = dynamicRelationsUtils.listRegisteredEntities();
+
+        assertNotNull(result);
+        assertEquals(1, result.size());
+        assertEquals(SomeTestEntity.class, result.getFirst());
+    }
+
+    @Test
+    void testExtractEntityClassFromDao_WithInvalidRelationLink_ShouldThrowRuntimeException() {
+        InvalidRelationDao invalidDao = mock(InvalidRelationDao.class);
+        when(relationDaoFactory.getAllDaos()).thenReturn(Set.of(invalidDao));
+
+        RuntimeException exception = assertThrows(RuntimeException.class, () -> dynamicRelationsUtils.listRegisteredEntities());
+
+        assertTrue(exception.getMessage().contains("Could not find sourceObject field"));
+        assertTrue(exception.getMessage().contains("InvalidRelationDao"));
+        verify(relationDaoFactory, times(1)).getAllDaos();
+    }
+
+    @Test
+    void testListRegisteredEntities_WithSingleDao_ShouldReturnSingleEntity() {
+        TestEntityRelationDao dao = mock(TestEntityRelationDao.class);
+        when(relationDaoFactory.getAllDaos()).thenReturn(Set.of(dao));
+
+        List<Class<?>> result = dynamicRelationsUtils.listRegisteredEntities();
+
+        assertNotNull(result);
+        assertEquals(1, result.size());
+        assertEquals(SomeTestEntity.class, result.getFirst());
+        verify(relationDaoFactory, times(1)).getAllDaos();
+    }
+
+    @Test
+    void testListRegisteredEntities_VerifyStreamProcessing() {
+        TestEntityRelationDao dao1 = mock(TestEntityRelationDao.class);
+        AnotherTestEntityRelationDao dao2 = mock(AnotherTestEntityRelationDao.class);
+        TestEntityRelationDao dao3 = mock(TestEntityRelationDao.class);
+
+        when(relationDaoFactory.getAllDaos()).thenReturn(Set.of(dao1, dao2, dao3));
+
+        List<Class<?>> result = dynamicRelationsUtils.listRegisteredEntities();
+
+        assertNotNull(result);
+        assertEquals(2, result.size());
+        assertTrue(result.contains(SomeTestEntity.class));
+        assertTrue(result.contains(AnotherTestEntity.class));
+
+        assertInstanceOf(List.class, result);
+        verify(relationDaoFactory, times(1)).getAllDaos();
+    }
+}

testing/src/test/java/at/test/drm/ApplicationIntegrationTest.java

@@ -1,5 +1,11 @@
 package at.test.drm;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import at.drm.dao.RelationDao;
+import at.drm.factory.RelationDaoFactory;
+import at.drm.util.DynamicRelationsUtils;
 import java.util.List;
 import java.util.Set;
 
@@ -32,6 +38,10 @@ class ApplicationIntegrationTest {
     private RelationService relationService;
     @Autowired
     private DynamicRelationsPrintService dynamicRelationsPrintService;
+    @Autowired
+    private DynamicRelationsUtils dynamicRelationsUtils;
+    @Autowired
+    private RelationDaoFactory relationDaoFactory;
 
     @Test
     void shouldFindRelationBySourceObject() {
@@ -165,4 +175,15 @@ void shouldPrintRelationsWithCyclicRelations() {
               DocumentEntityType
             """);
     }
+
+    @Test
+    void testListRegisteredEntities_shouldReturnRegisteredEntities() {
+        List<Class<?>> result = dynamicRelationsUtils.listRegisteredEntities();
+        assertThat(result).hasSize(3);
+        assertThat(result).containsExactlyInAnyOrder(
+            PersonEntity.class,
+            DogEntity.class,
+            DocumentEntity.class
+        );
+    }
 }