DATACMNS-822 - Polishing.

Switched to implement WebMvcConfigurer over extending WebMvcConfigurerAdapter. Formatting, assertions, Javadoc.

Original pull request: #208.

src/main/java/org/springframework/data/web/config/HateoasAwareSpringDataWebConfiguration.java

@@ -58,8 +58,8 @@ public class HateoasAwareSpringDataWebConfiguration extends SpringDataWebConfigu
 	@Override
 	public HateoasPageableHandlerMethodArgumentResolver pageableResolver() {
 
-		HateoasPageableHandlerMethodArgumentResolver pageableResolver = //
-				new HateoasPageableHandlerMethodArgumentResolver(sortResolver());
+		HateoasPageableHandlerMethodArgumentResolver pageableResolver = new HateoasPageableHandlerMethodArgumentResolver(
+				sortResolver());
 		customizePageableResolver(pageableResolver);
 		return pageableResolver;
 	}

src/main/java/org/springframework/data/web/config/PageableHandlerMethodArgumentResolverCustomizer.java

@@ -22,14 +22,17 @@ import org.springframework.data.web.PageableHandlerMethodArgumentResolver;
  * {@link PageableHandlerMethodArgumentResolver} configuration.
  *
  * @author Vedran Pavic
+ * @author Oliver Gierke
+ * @since 2.0
  */
+@FunctionalInterface
 public interface PageableHandlerMethodArgumentResolverCustomizer {
 
 	/**
-	 * Customize the pageable resolver
+	 * Customize the given {@link PageableHandlerMethodArgumentResolver}.
 	 *
-	 * @param pageableResolver the {@link PageableHandlerMethodArgumentResolver} to customize
+	 * @param pageableResolver the {@link PageableHandlerMethodArgumentResolver} to customize, will never be
+	 *          {@literal null}.
 	 */
 	void customize(PageableHandlerMethodArgumentResolver pageableResolver);
-
 }

src/main/java/org/springframework/data/web/config/QuerydslWebConfiguration.java

@@ -29,7 +29,7 @@ import org.springframework.data.querydsl.SimpleEntityPathResolver;
 import org.springframework.data.querydsl.binding.QuerydslBindingsFactory;
 import org.springframework.data.web.querydsl.QuerydslPredicateArgumentResolver;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 import com.querydsl.core.types.Predicate;
 
@@ -42,7 +42,7 @@ import com.querydsl.core.types.Predicate;
  * @soundtrack Anika Nilles - Alter Ego
  */
 @Configuration
-public class QuerydslWebConfiguration extends WebMvcConfigurerAdapter {
+public class QuerydslWebConfiguration implements WebMvcConfigurer {
 
 	@Autowired @Qualifier("mvcConversionService") ObjectFactory<ConversionService> conversionService;
 

src/main/java/org/springframework/data/web/config/SortHandlerMethodArgumentResolverCustomizer.java

@@ -22,14 +22,15 @@ import org.springframework.data.web.SortHandlerMethodArgumentResolver;
  * {@link SortHandlerMethodArgumentResolver} configuration.
  *
  * @author Vedran Pavic
+ * @author Oliver Gierke
+ * @since 2.0
  */
 public interface SortHandlerMethodArgumentResolverCustomizer {
 
 	/**
-	 * Customize the sort resolver
+	 * Customize the given {@link SortHandlerMethodArgumentResolver}.
 	 *
-	 * @param sortResolver the {@link SortHandlerMethodArgumentResolver} to customize
+	 * @param sortResolver the {@link SortHandlerMethodArgumentResolver} to customize, will never be {@literal null}.
 	 */
 	void customize(SortHandlerMethodArgumentResolver sortResolver);
-
 }

src/main/java/org/springframework/data/web/config/SpringDataWebConfiguration.java

@@ -36,9 +36,10 @@ import org.springframework.data.web.XmlBeamHttpMessageConverter;
 import org.springframework.format.FormatterRegistry;
 import org.springframework.format.support.FormattingConversionService;
 import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 
@@ -52,18 +53,19 @@ import com.fasterxml.jackson.databind.ObjectMapper;
  * @author Jens Schauder
  */
 @Configuration
-public class SpringDataWebConfiguration extends WebMvcConfigurerAdapter {
+public class SpringDataWebConfiguration implements WebMvcConfigurer {
 
 	private final ApplicationContext context;
 	private final ObjectFactory<ConversionService> conversionService;
 
-	@Autowired private Optional<PageableHandlerMethodArgumentResolverCustomizer> pageableResolverCustomizer;
-	@Autowired private Optional<SortHandlerMethodArgumentResolverCustomizer> sortResolverCustomizer;
+	private @Autowired Optional<PageableHandlerMethodArgumentResolverCustomizer> pageableResolverCustomizer;
+	private @Autowired Optional<SortHandlerMethodArgumentResolverCustomizer> sortResolverCustomizer;
 
-	public SpringDataWebConfiguration( //
-			ApplicationContext context, //
-			@Qualifier("mvcConversionService") ObjectFactory<ConversionService> conversionService //
-	) {
+	public SpringDataWebConfiguration(ApplicationContext context,
+			@Qualifier("mvcConversionService") ObjectFactory<ConversionService> conversionService) {
+
+		Assert.notNull(context, "ApplicationContext must not be null!");
+		Assert.notNull(conversionService, "ConversionService must not be null!");
 
 		this.context = context;
 		this.conversionService = conversionService;
@@ -161,5 +163,4 @@ public class SpringDataWebConfiguration extends WebMvcConfigurerAdapter {
 	protected void customizeSortResolver(SortHandlerMethodArgumentResolver sortResolver) {
 		sortResolverCustomizer.ifPresent(c -> c.customize(sortResolver));
 	}
-
 }