DATAMONGO-2287: Adding Support for Array Aggregate In

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/aggregation/ArrayOperators.java

@@ -33,6 +33,7 @@
  *
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Shashank Sharma
  * @since 1.0
  */
 public class ArrayOperators {
@@ -1496,6 +1497,29 @@ public In containsValue(Object value) {
 			};
 		}
 
+		/**
+		 * Support for Aggregation In
+		 * Search an Element in List of Objects to Filter
+		 * Start creating {@link In}.
+		 * @author Shashank Sharma
+		 * @param elementList must not be {@literal null}.
+		 * @return
+		 */
+		public static InBuilder arrayOf(final List<Object> elementList) {
+
+			Assert.notNull(elementList, "Elements must not be null!");
+
+			return new InBuilder() {
+
+				@Override
+				public In containsValue(Object value) {
+
+					Assert.notNull(value, "Value must not be null!");
+					return new In(Arrays.asList(value, elementList));
+				}
+			};
+		}
+
 		/**
 		 * @author Christoph Strobl
 		 */

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/aggregation/ArrayOperatorsUnitTests.java

@@ -61,4 +61,12 @@ public void toArrayWithArgumentList() {
 		assertThat(ArrayToObject.arrayToObject(source).toDocument(Aggregation.DEFAULT_CONTEXT))
 				.isEqualTo(Document.parse("{ $arrayToObject: [ [ \"king\", \"shrewd\"], [ \"prince\", \"verity\" ] ] } "));
 	}
+
+	@Test // DATAMONGO-2287
+	public void inArrayAggregationWithArgumentList() {
+
+		assertThat(ArrayOperators.In.arrayOf(Arrays.asList("Shashank", "Sharma"))
+				.containsValue("$userName").toDocument(Aggregation.DEFAULT_CONTEXT))
+				.isEqualTo(Document.parse("{ \"$in\" : [\"$userName\", [\"Shashank\", \"Sharma\"]] }"));
+	}
 }