DATACOUCH-296 Add support for delete n1ql queries

Changes to support delete query by query derivation and SpEL based
queries.
- Adds a N1qlMutateQueryCreator which constucts the delete query
using dsl.
- Adds new SpEL values delete and returning required for delete
queries.

Original pull request: #144.

src/integration/java/org/springframework/data/couchbase/repository/N1qlCouchbaseRepositoryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 the original author or authors.
+ * Copyright 2013-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,6 +45,7 @@ import java.util.List;
  * This tests PaginAndSortingRepository features in the Couchbase connector.
  *
  * @author Simon Baslé
+ * @author Subhashni Balakrishnan
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(classes = IntegrationTestApplicationConfig.class)
@@ -185,4 +186,12 @@ public class N1qlCouchbaseRepositoryTests {
     Sort sort = new Sort(Sort.Direction.DESC, "attendees");
     List<Party> parties = partyRepository.findParties(sort);
   }
+
+  @Test
+  public void testDeleteQuery() {
+    partyRepository.save(new Party("testDeleteQuery", "delete", "delete", null, 0, null));
+    List<Party> partyList = partyRepository.removeByDescriptionOrName("delete", "delete");
+    assertTrue(partyList.size() == 1);
+  }
+
 }

src/integration/java/org/springframework/data/couchbase/repository/N1qlPlaceholderTests.java

@@ -120,4 +120,19 @@ public class N1qlPlaceholderTests {
           "one over the other in findAllWithMixedParamsInQuery", e.getMessage());
     }
   }
+
+  @Test
+  public void deleteQueryTest() {
+    String included = "90";
+    String excluded = "New Year";
+    int max = 200;
+    List<Party> result = partyRepository.removeWithPositionalParams(excluded, included, max);
+
+    assertEquals(10, result.size());
+    for (Party party : result) {
+      assertTrue(party.getDescription().contains(included));
+      assertFalse(party.getDescription().contains(excluded));
+      assertTrue(party.getAttendees() < max);
+    }
+  }
 }

src/integration/java/org/springframework/data/couchbase/repository/PartyRepository.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.springframework.data.couchbase.repository;
 
 import java.util.Date;
@@ -14,6 +30,7 @@ import org.springframework.data.repository.query.Param;
 
 /**
  * @author Simon Baslé
+ * @author Subhashni Balakrishnan
  */
 @ViewIndexed(designDoc = "party", viewName = "all")
 @N1qlSecondaryIndexed(indexName = "party")
@@ -59,10 +76,15 @@ public interface PartyRepository extends CouchbaseRepository<Party, String> {
       " AND `desc` NOT LIKE '%' || $1 || '%'")
   List<Party> findAllWithPositionalParams(String ex, String inc, long minimumAttendees);
 
+  @Query("#{#n1ql.delete} WHERE #{#n1ql.filter} AND `desc` LIKE '%' || $2 ||  '%' AND attendees < $3" +
+          " AND `desc` NOT LIKE '%' || $1 || '%' #{#n1ql.returning}")
+  List<Party> removeWithPositionalParams(String ex, String inc, long minimumAttendees);
+
   @Query("#{#n1ql.selectEntity} WHERE #{#n1ql.filter} AND `desc` LIKE '%' || $2 ||  '%' AND attendees >= $3" +
       " AND `desc` NOT LIKE '%' || $1 || '%' AND `desc` != \"this is \\\"$excluded\\\"\"")
   List<Party> findAllWithPositionalParamsAndQuotedNamedParams(@Param("excluded") String ex, @Param("included") String inc, @Param("min") long min);
 
   List<Party> findByDescriptionOrName(String description, String name);
 
+  List<Party> removeByDescriptionOrName(String description, String name);
 }