DATAJDBC-100 - @EnableJdbcRepositories.

Adds the @EnableJdbcRepositories annotation, which when used on a Spring configuration enables scanning packages for JDBC repositories.

Original pull request: #6.

src/main/java/org/springframework/data/jdbc/repository/config/EnableJdbcRepositories.java

@@ -0,0 +1,98 @@
+/*
+ * 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.jdbc.repository.config;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.beans.factory.FactoryBean;
+import org.springframework.context.annotation.ComponentScan.Filter;
+import org.springframework.context.annotation.Import;
+import org.springframework.data.jdbc.repository.support.JdbcRepositoryFactoryBean;
+
+/**
+ * Annotation to enable JDBC repositories. Will scan the package of the annotated configuration class for Spring Data
+ * repositories by default.
+ *
+ * @author Jens Schauder
+ * @since 2.0
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Inherited
+@Import(JdbcRepositoriesRegistrar.class)
+public @interface EnableJdbcRepositories {
+
+	/**
+	 * Alias for the {@link #basePackages()} attribute. Allows for more concise annotation declarations e.g.:
+	 * {@code @EnableJpaRepositories("org.my.pkg")} instead of {@code @EnableJpaRepositories(basePackages="org.my.pkg")}.
+	 */
+	String[] value() default {};
+
+	/**
+	 * Base packages to scan for annotated components. {@link #value()} is an alias for (and mutually exclusive with) this
+	 * attribute. Use {@link #basePackageClasses()} for a type-safe alternative to String-based package names.
+	 */
+	String[] basePackages() default {};
+
+	/**
+	 * Type-safe alternative to {@link #basePackages()} for specifying the packages to scan for annotated components. The
+	 * package of each class specified will be scanned. Consider creating a special no-op marker class or interface in
+	 * each package that serves no purpose other than being referenced by this attribute.
+	 */
+	Class<?>[] basePackageClasses() default {};
+
+	/**
+	 * Specifies which types are eligible for component scanning. Further narrows the set of candidate components from
+	 * everything in {@link #basePackages()} to everything in the base packages that matches the given filter or filters.
+	 */
+	Filter[] includeFilters() default {};
+
+	/**
+	 * Specifies which types are not eligible for component scanning.
+	 */
+	Filter[] excludeFilters() default {};
+
+	/**
+	 * Configures whether nested repository-interfaces (e.g. defined as inner classes) should be discovered by the
+	 * repositories infrastructure.
+	 */
+	boolean considerNestedRepositories() default false;
+
+	/**
+	 * Returns the {@link FactoryBean} class to be used for each repository instance. Defaults to
+	 * {@link JdbcRepositoryFactoryBean}.
+	 */
+	Class<?> repositoryFactoryBeanClass() default JdbcRepositoryFactoryBean.class;
+
+	/**
+	 * Configures the location of where to find the Spring Data named queries properties file. Will default to
+	 * {@code META-INF/jdbc-named-queries.properties}.
+	 */
+	String namedQueriesLocation() default "";
+	
+	/**
+	 * Returns the postfix to be used when looking up custom repository implementations. Defaults to {@literal Impl}. So
+	 * for a repository named {@code PersonRepository} the corresponding implementation class will be looked up scanning
+	 * for {@code PersonRepositoryImpl}.
+	 */
+	String repositoryImplementationPostfix() default "Impl";
+}

src/main/java/org/springframework/data/jdbc/repository/config/JdbcRepositoriesRegistrar.java

@@ -0,0 +1,49 @@
+/*
+ * 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.jdbc.repository.config;
+
+import java.lang.annotation.Annotation;
+
+import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
+import org.springframework.data.repository.config.RepositoryBeanDefinitionRegistrarSupport;
+import org.springframework.data.repository.config.RepositoryConfigurationExtension;
+
+/**
+ * {@link ImportBeanDefinitionRegistrar} to enable {@link EnableJdbcRepositories} annotation.
+ *
+ * @author Jens Schauder
+ * @since 2.0
+ */
+class JdbcRepositoriesRegistrar extends RepositoryBeanDefinitionRegistrarSupport {
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.config.RepositoryBeanDefinitionRegistrarSupport#getAnnotation()
+	 */
+	@Override
+	protected Class<? extends Annotation> getAnnotation() {
+		return EnableJdbcRepositories.class;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.config.RepositoryBeanDefinitionRegistrarSupport#getExtension()
+	 */
+	@Override
+	protected RepositoryConfigurationExtension getExtension() {
+		return new JdbcRepositoryConfigExtension();
+	}
+}

src/main/java/org/springframework/data/jdbc/repository/config/JdbcRepositoryConfigExtension.java

@@ -0,0 +1,59 @@
+/*
+ * 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.jdbc.repository.config;
+
+import java.util.Locale;
+
+import org.springframework.data.jdbc.repository.support.JdbcRepositoryFactoryBean;
+import org.springframework.data.repository.config.RepositoryConfigurationExtensionSupport;
+
+/**
+ * {@link org.springframework.data.repository.config.RepositoryConfigurationExtension} extending the repository
+ * registration process by registering JDBC repositories.
+ *
+ * @author Jens Schauder
+ * @since 2.0
+ */
+public class JdbcRepositoryConfigExtension extends RepositoryConfigurationExtensionSupport {
+
+	/*
+	* (non-Javadoc)
+	* @see org.springframework.data.repository.config.RepositoryConfigurationExtension#getModuleName()
+	 */
+	@Override
+	public String getModuleName() {
+		return "JDBC";
+	}
+
+	/*
+	* (non-Javadoc)
+	* @see org.springframework.data.repository.config.RepositoryConfigurationExtensionSupport#getRepositoryFactoryBeanClassName()
+	 */
+	@Override
+	public String getRepositoryFactoryBeanClassName() {
+		return JdbcRepositoryFactoryBean.class.getName();
+	}
+
+	/*
+	* (non-Javadoc)
+	* @see org.springframework.data.repository.config.RepositoryConfigurationExtensionSupport#getModulePrefix()
+	 */
+	@Override
+	protected String getModulePrefix() {
+		return getModuleName().toLowerCase(Locale.US);
+	}
+
+}

src/main/java/org/springframework/data/jdbc/repository/support/JdbcRepositoryFactoryBean.java

@@ -0,0 +1,100 @@
+/*
+ * 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.jdbc.repository.support;
+
+import java.io.Serializable;
+import java.util.Map;
+import java.util.Optional;
+
+import javax.sql.DataSource;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.data.repository.Repository;
+import org.springframework.data.repository.core.support.RepositoryFactorySupport;
+import org.springframework.data.repository.core.support.TransactionalRepositoryFactoryBeanSupport;
+import org.springframework.data.util.Optionals;
+import org.springframework.jdbc.core.JdbcOperations;
+import org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations;
+import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
+
+/**
+ * Special adapter for Springs {@link org.springframework.beans.factory.FactoryBean} interface to allow easy setup of
+ * repository factories via Spring configuration.
+ *
+ * @author Jens Schauder
+ * @since 2.0
+ */
+public class JdbcRepositoryFactoryBean<T extends Repository<S, ID>, S, ID extends Serializable> //
+		extends TransactionalRepositoryFactoryBeanSupport<T, S, ID> {
+
+	private static final String NO_NAMED_PARAMETER_JDBC_OPERATION_ERROR_MESSAGE = //
+			"No unique NamedParameterJdbcOperation could be found, " //
+					+ "nor JdbcOperations or DataSource to construct one from.";
+
+	private static final String NAMED_PARAMETER_JDBC_OPERATIONS_BEAN_NAME = "namedParameterJdbcTemplate";
+	private static final String JDBC_OPERATIONS_BEAN_NAME = "jdbcTemplate";
+	private static final String DATA_SOURCE_BEAN_NAME = "dataSource";
+
+	private final ApplicationEventPublisher applicationEventPublisher;
+	private final ApplicationContext context;
+
+	JdbcRepositoryFactoryBean(Class<? extends T> repositoryInterface, ApplicationEventPublisher applicationEventPublisher,
+			ApplicationContext context) {
+
+		super(repositoryInterface);
+		this.applicationEventPublisher = applicationEventPublisher;
+		this.context = context;
+	}
+
+	@Override
+	protected RepositoryFactorySupport doCreateRepositoryFactory() {
+		return new JdbcRepositoryFactory(findOrCreateJdbcOperations(), applicationEventPublisher);
+	}
+
+	private NamedParameterJdbcOperations findOrCreateJdbcOperations() {
+
+		return Optionals
+				.firstNonEmpty( //
+						this::getNamedParameterJdbcOperations, //
+						() -> getJdbcOperations().map(NamedParameterJdbcTemplate::new), //
+						() -> getDataSource().map(NamedParameterJdbcTemplate::new)) //
+				.orElseThrow(() -> new IllegalStateException(NO_NAMED_PARAMETER_JDBC_OPERATION_ERROR_MESSAGE));
+	}
+
+	private Optional<NamedParameterJdbcOperations> getNamedParameterJdbcOperations() {
+		return getBean(NamedParameterJdbcOperations.class, NAMED_PARAMETER_JDBC_OPERATIONS_BEAN_NAME);
+	}
+
+	private Optional<JdbcOperations> getJdbcOperations() {
+		return getBean(JdbcOperations.class, JDBC_OPERATIONS_BEAN_NAME);
+	}
+
+	private Optional<DataSource> getDataSource() {
+		return getBean(DataSource.class, DATA_SOURCE_BEAN_NAME);
+	}
+
+	private <R> Optional<R> getBean(Class<R> type, String name) {
+
+		Map<String, R> beansOfType = context.getBeansOfType(type);
+
+		if (beansOfType.size() == 1) {
+			return beansOfType.values().stream().findFirst();
+		}
+
+		return Optional.ofNullable(beansOfType.get(name));
+	}
+}