From ae8697c3158ed6e87a389afdeb4c4bb9ebcf97e1 Mon Sep 17 00:00:00 2001
From: stvort <stvort@mail.ru>
Date: Sat, 11 May 2024 20:02:03 +0400
Subject: [PATCH] jpa template added

---
 .../ru/otus/hw/models/ModelsCommonTest.java   | 132 ++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 templates/hw06-jpa/src/test/java/ru/otus/hw/models/ModelsCommonTest.java

diff --git a/templates/hw06-jpa/src/test/java/ru/otus/hw/models/ModelsCommonTest.java b/templates/hw06-jpa/src/test/java/ru/otus/hw/models/ModelsCommonTest.java
new file mode 100644
index 00000000..9ab54995
--- /dev/null
+++ b/templates/hw06-jpa/src/test/java/ru/otus/hw/models/ModelsCommonTest.java
@@ -0,0 +1,132 @@
+package ru.otus.hw.models;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.OneToOne;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.reflections.ReflectionUtils;
+import org.reflections.Reflections;
+
+import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static java.util.Objects.isNull;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ModelsCommonTest {
+
+    private static Set<Class<?>> entitiesClasses;
+
+    @BeforeAll
+    static void setUpAll() {
+        /*
+        Чтобы работало подключить
+        <properties>
+            <reflections.version>0.10.2</reflections.version>
+        </properties>
+
+        <dependency>
+            <groupId>org.reflections</groupId>
+            <artifactId>reflections</artifactId>
+            <version>${reflections.version}</version>
+        </dependency>
+         */
+        var reflections = new Reflections("ru.otus.hw.models");
+        entitiesClasses = reflections.getTypesAnnotatedWith(Entity.class);
+
+    }
+
+    @ParameterizedTest
+    @MethodSource("getEntities")
+    void shouldBeNoOneToOneRelationshipsInModelClasses(Class<?> entityClass) {
+
+        var oneToOneRelationshipExists = Arrays.stream(entityClass.getDeclaredFields())
+                .anyMatch(f -> f.isAnnotationPresent(OneToOne.class));
+        assertThat(oneToOneRelationshipExists)
+                .withFailMessage("В доменной модели ДЗ не предусмотрены связи OneToOne")
+                .isFalse();
+    }
+
+    @ParameterizedTest
+    @MethodSource("getEntities")
+    void shouldBeNoEagerRelationshipsInModelClasses(Class<?> entityClass) {
+        boolean eagerFetchExists = Arrays.stream(entityClass.getDeclaredFields())
+                .map(f -> getRelationAnnotationArgumentValue(f, "fetch", FetchType.class))
+                .filter(Objects::nonNull)
+                .anyMatch(fetchType -> fetchType.equals(FetchType.EAGER));
+        assertThat(eagerFetchExists)
+                .withFailMessage("Лучше все связи сделать LAZY")
+                .isFalse();
+    }
+
+    @ParameterizedTest
+    @MethodSource("getEntities")
+    void shouldMappedForBidirectionalRelationshipsInModelClasses(Class<?> entityClass) {
+        var relationsEntries = findAllRelationsEntry(entityClass);
+        var hasBidirectionalRelationshipsWithoutMappedBy = relationsEntries.entrySet().stream()
+                .anyMatch(relationEntry -> {
+                    var reverseRelations = findAllRelationsEntry(relationEntry.getKey());
+                    var reverseRelationField = reverseRelations.get(entityClass);
+                    if (isNull(reverseRelationField)) {
+                        return false;
+                    }
+                    var relationFieldName = relationEntry.getValue().getName();
+                    var reverseRelationFieldName = reverseRelationField.getName();
+                    var mappedByValue = getRelationAnnotationArgumentValue(relationEntry.getValue(),
+                            "mappedBy", String.class);
+                    var reverseMappedByValue = getRelationAnnotationArgumentValue(reverseRelationField,
+                            "mappedBy", String.class);
+
+                    return !reverseRelationFieldName.equals(mappedByValue) &&
+                            !relationFieldName.equals(reverseMappedByValue);
+                });
+        assertThat(hasBidirectionalRelationshipsWithoutMappedBy)
+                .withFailMessage("Двунаправленные связи должны быть настроены с помощью mappedBy")
+                .isFalse();
+
+    }
+
+    private static Stream<Arguments> getEntities() {
+        return entitiesClasses.stream().map(Arguments::of);
+    }
+
+    private <T> T getRelationAnnotationArgumentValue(Field field, String argumentName, Class<T> returnType) {
+        return Arrays.stream(field.getAnnotations())
+                .flatMap(a -> Arrays.stream(a.getClass().getDeclaredMethods()).map(m -> Map.entry(m, a)))
+                .filter(e -> e.getKey().getName().equals(argumentName))
+                .map(e -> ReflectionUtils.invoke(e.getKey(), e.getValue()))
+                .map(returnType::cast)
+                .findFirst().orElse(null);
+    }
+
+    private Map<? extends Class<?>, Field> findAllRelationsEntry(Class<?> entityClass) {
+        return Arrays.stream(entityClass.getDeclaredFields())
+                .filter(f -> !f.getType().isPrimitive())
+                .map(f -> Map.entry(f, fieldToClass(f)))
+                .filter(e -> entitiesClasses.contains(e.getValue()))
+                .collect(Collectors.toMap(Map.Entry::getValue, Map.Entry::getKey));
+    }
+
+    private Class<?> fieldToClass(Field field) {
+        var className = field.getType().getName();
+        if (Collection.class.isAssignableFrom(field.getType())) {
+            className = field.getGenericType().getTypeName()
+                    .split("<")[1].split(">")[0];
+
+        }
+        try {
+            return Class.forName(className);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
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