DATAMONGO-2267 - Polishing.

Reuse collection name for index creation instead of resolving the collection for every index. Switch lambda to method reference.

Original pull request: #746.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/ObjectPath.java

@@ -87,7 +87,7 @@ class ObjectPath {
 		Assert.notNull(object, "Object must not be null!");
 		Assert.notNull(entity, "MongoPersistentEntity must not be null!");
 
-		return new ObjectPath(this, object, id, Lazy.of(() -> entity.getCollection()));
+		return new ObjectPath(this, object, id, Lazy.of(entity::getCollection));
 	}
 
 	/**

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/index/MongoPersistentEntityIndexCreator.java

@@ -134,16 +134,18 @@ public class MongoPersistentEntityIndexCreator implements ApplicationListener<Ma
 	private void checkForAndCreateIndexes(MongoPersistentEntity<?> entity) {
 
 		if (entity.isAnnotationPresent(Document.class)) {
+
+			String collection = entity.getCollection();
+
 			for (IndexDefinition indexDefinition : indexResolver.resolveIndexFor(entity.getTypeInformation())) {
 
 				JustOnceLogger.logWarnIndexCreationConfigurationChange(this.getClass().getName());
 
 				IndexDefinitionHolder indexToCreate = indexDefinition instanceof IndexDefinitionHolder
 						? (IndexDefinitionHolder) indexDefinition
-						: new IndexDefinitionHolder("", indexDefinition, entity.getCollection());
+						: new IndexDefinitionHolder("", indexDefinition, collection);
 
 				createIndex(indexToCreate);
-
 			}
 		}
 	}

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/index/MongoPersistentEntityIndexResolver.java

@@ -118,14 +118,15 @@ public class MongoPersistentEntityIndexResolver implements IndexResolver {
 		Document document = root.findAnnotation(Document.class);
 		Assert.notNull(document, "Given entity is not collection root.");
 
-		final List<IndexDefinitionHolder> indexInformation = new ArrayList<>();
-		indexInformation.addAll(potentiallyCreateCompoundIndexDefinitions("", root.getCollection(), root));
-		indexInformation.addAll(potentiallyCreateTextIndexDefinition(root));
+		List<IndexDefinitionHolder> indexInformation = new ArrayList<>();
+		String collection = root.getCollection();
+		indexInformation.addAll(potentiallyCreateCompoundIndexDefinitions("", collection, root));
+		indexInformation.addAll(potentiallyCreateTextIndexDefinition(root, collection));
 
 		root.doWithProperties((PropertyHandler<MongoPersistentProperty>) property -> this
 				.potentiallyAddIndexForProperty(root, property, indexInformation, new CycleGuard()));
 
-		indexInformation.addAll(resolveIndexesForDbrefs("", root.getCollection(), root));
+		indexInformation.addAll(resolveIndexesForDbrefs("", collection, root));
 
 		return indexInformation;
 	}
@@ -225,7 +226,7 @@ public class MongoPersistentEntityIndexResolver implements IndexResolver {
 	}
 
 	private Collection<? extends IndexDefinitionHolder> potentiallyCreateTextIndexDefinition(
-			MongoPersistentEntity<?> root) {
+			MongoPersistentEntity<?> root, String collection) {
 
 		String name = root.getType().getSimpleName() + "_TextIndex";
 		if (name.getBytes().length > 127) {
@@ -261,7 +262,7 @@ public class MongoPersistentEntityIndexResolver implements IndexResolver {
 			return Collections.emptyList();
 		}
 
-		IndexDefinitionHolder holder = new IndexDefinitionHolder("", indexDefinition, root.getCollection());
+		IndexDefinitionHolder holder = new IndexDefinitionHolder("", indexDefinition, collection);
 		return Collections.singletonList(holder);
 
 	}

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/index/ReactiveMongoPersistentEntityIndexCreator.java

@@ -125,11 +125,13 @@ public class ReactiveMongoPersistentEntityIndexCreator {
 		List<Mono<?>> publishers = new ArrayList<>();
 
 		if (entity.isAnnotationPresent(Document.class)) {
+
+			String collection = entity.getCollection();
 			for (IndexDefinition indexDefinition : indexResolver.resolveIndexFor(entity.getTypeInformation())) {
 
 				IndexDefinitionHolder indexToCreate = indexDefinition instanceof IndexDefinitionHolder
 						? (IndexDefinitionHolder) indexDefinition
-						: new IndexDefinitionHolder("", indexDefinition, entity.getCollection());
+						: new IndexDefinitionHolder("", indexDefinition, collection);
 
 				publishers.add(createIndex(indexToCreate));
 			}

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/convert/ObjectPathUnitTests.java

@@ -26,6 +26,8 @@ import org.springframework.data.mongodb.core.mapping.MongoPersistentEntity;
 import org.springframework.data.util.ClassTypeInformation;
 
 /**
+ * Unit tests for {@link ObjectPath}.
+ *
  * @author Christoph Strobl
  */
 public class ObjectPathUnitTests {
@@ -37,9 +39,9 @@ public class ObjectPathUnitTests {
 	@Before
 	public void setUp() {
 
-		one = new BasicMongoPersistentEntity(ClassTypeInformation.from(EntityOne.class));
-		two = new BasicMongoPersistentEntity(ClassTypeInformation.from(EntityTwo.class));
-		three = new BasicMongoPersistentEntity(ClassTypeInformation.from(EntityThree.class));
+		one = new BasicMongoPersistentEntity<>(ClassTypeInformation.from(EntityOne.class));
+		two = new BasicMongoPersistentEntity<>(ClassTypeInformation.from(EntityTwo.class));
+		three = new BasicMongoPersistentEntity<>(ClassTypeInformation.from(EntityThree.class));
 	}
 
 	@Test // DATAMONGO-1703
@@ -96,20 +98,12 @@ public class ObjectPathUnitTests {
 	}
 
 	@Document("one")
-	static class EntityOne {
-
-	}
+	static class EntityOne {}
 
-	static class EntityTwo extends EntityOne {
-
-	}
+	static class EntityTwo extends EntityOne {}
 
-	interface ValueInterface {
-
-	}
+	interface ValueInterface {}
 
 	@Document("three")
-	static class EntityThree implements ValueInterface {
-
-	}
+	static class EntityThree implements ValueInterface {}
 }