DATAMONGO-952 - Derived queries should consider field specification in @Query.

PartTreeMongoQuery now explicitly check the presence of a manually defined field spec on the query method and creates a new Query if so.

Original pull request: #188.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/PartTreeMongoQuery.java

@@ -19,10 +19,14 @@ import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.mongodb.core.MongoOperations;
 import org.springframework.data.mongodb.core.MongoTemplate;
 import org.springframework.data.mongodb.core.mapping.MongoPersistentProperty;
+import org.springframework.data.mongodb.core.query.BasicQuery;
 import org.springframework.data.mongodb.core.query.Query;
 import org.springframework.data.repository.query.QueryMethod;
 import org.springframework.data.repository.query.RepositoryQuery;
 import org.springframework.data.repository.query.parser.PartTree;
+import org.springframework.util.StringUtils;
+
+import com.mongodb.util.JSONParseException;
 
 /**
  * {@link RepositoryQuery} implementation for Mongo.
@@ -67,7 +71,24 @@ public class PartTreeMongoQuery extends AbstractMongoQuery {
 	protected Query createQuery(ConvertingParameterAccessor accessor) {
 
 		MongoQueryCreator creator = new MongoQueryCreator(tree, accessor, context, isGeoNearQuery);
-		return creator.createQuery();
+		Query query = creator.createQuery();
+
+		String fieldSpec = this.getQueryMethod().getFieldSpecification();
+
+		if (!StringUtils.hasText(fieldSpec)) {
+			return query;
+		}
+
+		try {
+
+			BasicQuery result = new BasicQuery(query.getQueryObject().toString(), fieldSpec);
+			result.setSortObject(query.getSortObject());
+			return result;
+
+		} catch (JSONParseException o_O) {
+			throw new IllegalStateException(String.format("Invalid query or field specification in %s!", getQueryMethod(),
+					o_O));
+		}
 	}
 
 	/* 

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/query/PartTreeMongoQueryUnitTests.java

@@ -0,0 +1,166 @@
+/*
+ * Copyright 2014 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.mongodb.repository.query;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+import java.lang.reflect.Method;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+import org.mockito.Matchers;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.data.mongodb.MongoDbFactory;
+import org.springframework.data.mongodb.core.MongoOperations;
+import org.springframework.data.mongodb.core.convert.DbRefResolver;
+import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver;
+import org.springframework.data.mongodb.core.convert.MappingMongoConverter;
+import org.springframework.data.mongodb.core.convert.MongoConverter;
+import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
+import org.springframework.data.mongodb.repository.MongoRepository;
+import org.springframework.data.mongodb.repository.Person;
+import org.springframework.data.mongodb.repository.Query;
+import org.springframework.data.repository.core.RepositoryMetadata;
+
+import com.mongodb.BasicDBObjectBuilder;
+
+/**
+ * Unit tests for {@link PartTreeMongoQuery}.
+ * 
+ * @author Christoph Strobl
+ * @author Oliver Gierke
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class PartTreeMongoQueryUnitTests {
+
+	@Mock RepositoryMetadata metadataMock;
+	@Mock MongoOperations mongoOperationsMock;
+
+	MongoMappingContext mappingContext;
+
+	public @Rule ExpectedException exception = ExpectedException.none();
+
+	@Before
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	public void setUp() {
+
+		when(metadataMock.getDomainType()).thenReturn((Class) Person.class);
+		when(metadataMock.getReturnedDomainClass(Matchers.any(Method.class))).thenReturn((Class) Person.class);
+		mappingContext = new MongoMappingContext();
+		DbRefResolver dbRefResolver = new DefaultDbRefResolver(mock(MongoDbFactory.class));
+		MongoConverter converter = new MappingMongoConverter(dbRefResolver, mappingContext);
+
+		when(mongoOperationsMock.getConverter()).thenReturn(converter);
+	}
+
+	/**
+	 * @see DATAMOGO-952
+	 */
+	@Test
+	public void rejectsInvalidFieldSpecification() {
+
+		exception.expect(IllegalStateException.class);
+		exception.expectMessage("findByLastname");
+
+		deriveQueryFromMethod("findByLastname", new Object[] { "foo" });
+	}
+
+	/**
+	 * @see DATAMOGO-952
+	 */
+	@Test
+	public void singleFieldJsonIncludeRestrictionShouldBeConsidered() {
+
+		org.springframework.data.mongodb.core.query.Query query = deriveQueryFromMethod("findByFirstname",
+				new Object[] { "foo" });
+
+		assertThat(query.getFieldsObject(), is(new BasicDBObjectBuilder().add("firstname", 1).get()));
+	}
+
+	/**
+	 * @see DATAMOGO-952
+	 */
+	@Test
+	public void multiFieldJsonIncludeRestrictionShouldBeConsidered() {
+
+		org.springframework.data.mongodb.core.query.Query query = deriveQueryFromMethod("findByFirstnameAndLastname",
+				new Object[] { "foo", "bar" });
+
+		assertThat(query.getFieldsObject(), is(new BasicDBObjectBuilder().add("firstname", 1).add("lastname", 1).get()));
+	}
+
+	/**
+	 * @see DATAMOGO-952
+	 */
+	@Test
+	public void multiFieldJsonExcludeRestrictionShouldBeConsidered() {
+
+		org.springframework.data.mongodb.core.query.Query query = deriveQueryFromMethod("findPersonByFirstnameAndLastname",
+				new Object[] { "foo", "bar" });
+
+		assertThat(query.getFieldsObject(), is(new BasicDBObjectBuilder().add("firstname", 0).add("lastname", 0).get()));
+	}
+
+	private org.springframework.data.mongodb.core.query.Query deriveQueryFromMethod(String method, Object[] args) {
+
+		Class<?>[] types = new Class<?>[args.length];
+
+		for (int i = 0; i < args.length; i++) {
+			types[i] = args[i].getClass();
+		}
+
+		PartTreeMongoQuery partTreeQuery = createQueryForMethod(method, types);
+
+		MongoParameterAccessor accessor = new MongoParametersParameterAccessor(partTreeQuery.getQueryMethod(), args);
+		return partTreeQuery.createQuery(new ConvertingParameterAccessor(mongoOperationsMock.getConverter(), accessor));
+	}
+
+	private PartTreeMongoQuery createQueryForMethod(String methodName, Class<?>... paramTypes) {
+
+		try {
+
+			Method method = Repo.class.getMethod(methodName, paramTypes);
+			MongoQueryMethod queryMethod = new MongoQueryMethod(method, metadataMock, mappingContext);
+
+			return new PartTreeMongoQuery(queryMethod, mongoOperationsMock);
+		} catch (NoSuchMethodException e) {
+			throw new IllegalArgumentException(e.getMessage(), e);
+		} catch (SecurityException e) {
+			throw new IllegalArgumentException(e.getMessage(), e);
+		}
+	}
+
+	interface Repo extends MongoRepository<Person, Long> {
+
+		@Query(fields = "firstname")
+		Person findByLastname(String lastname);
+
+		@Query(fields = "{ 'firstname' : 1 }")
+		Person findByFirstname(String lastname);
+
+		@Query(fields = "{ 'firstname' : 1, 'lastname' : 1 }")
+		Person findByFirstnameAndLastname(String firstname, String lastname);
+
+		@Query(fields = "{ 'firstname' : 0, 'lastname' : 0 }")
+		Person findPersonByFirstnameAndLastname(String firstname, String lastname);
+	}
+}