DATAMONGO-1256 - Polishing.

Minor Javadoc polishing.

Original pull request: #316.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapping/event/AbstractDeleteEvent.java

@@ -33,7 +33,7 @@ public abstract class AbstractDeleteEvent<T> extends MongoMappingEvent<DBObject>
 	 * 
 	 * @param dbo must not be {@literal null}.
 	 * @param type can be {@literal null}.
-	 * @deprecated since 1.8. Please use {@link #AbstractDeleteEvent(DBObject, Class, String)}
+	 * @deprecated since 1.8. Please use {@link #AbstractDeleteEvent(DBObject, Class, String)}.
 	 */
 	@Deprecated
 	public AbstractDeleteEvent(DBObject dbo, Class<T> type) {
@@ -45,7 +45,7 @@ public abstract class AbstractDeleteEvent<T> extends MongoMappingEvent<DBObject>
 	 * 
 	 * @param dbo must not be {@literal null}.
 	 * @param type can be {@literal null}.
-	 * @param collectionName can be {@literal null}
+	 * @param collectionName can be {@literal null}.
 	 * @since 1.8
 	 */
 	public AbstractDeleteEvent(DBObject dbo, Class<T> type, String collectionName) {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapping/event/AbstractMongoEventListener.java

@@ -74,15 +74,16 @@ public abstract class AbstractMongoEventListener<E> implements ApplicationListen
 			}
 
 			return;
+
 		}
 
+		Object source = event.getSource();
+
 		// Check for matching domain type and invoke callbacks
-		if (event.getSource() != null && !domainClass.isAssignableFrom(event.getSource().getClass())) {
+		if (source != null && !domainClass.isAssignableFrom(source.getClass())) {
 			return;
 		}
 
-		E source = (E) event.getSource();
-
 		if (event instanceof BeforeConvertEvent) {
 			onBeforeConvert((BeforeConvertEvent<E>) event);
 		} else if (event instanceof BeforeSaveEvent) {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapping/event/BeforeConvertEvent.java

@@ -30,7 +30,7 @@ public class BeforeConvertEvent<T> extends MongoMappingEvent<T> {
 	 * Creates new {@link BeforeConvertEvent}.
 	 * 
 	 * @param source must not be {@literal null}.
-	 * @deprecated since 1.8. Please use {@link #BeforeConvertEvent(Object, String)}
+	 * @deprecated since 1.8. Please use {@link #BeforeConvertEvent(Object, String)}.
 	 */
 	@Deprecated
 	public BeforeConvertEvent(T source) {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapping/event/BeforeDeleteEvent.java

@@ -45,7 +45,7 @@ public class BeforeDeleteEvent<T> extends AbstractDeleteEvent<T> {
 	 * 
 	 * @param dbo must not be {@literal null}.
 	 * @param type can be {@literal null}.
-	 * @param collectionName can be {@literal null}
+	 * @param collectionName can be {@literal null}.
 	 * @since 1.8
 	 */
 	public BeforeDeleteEvent(DBObject dbo, Class<T> type, String collectionName) {