Polish

SPR-15576

spring-webflux/src/main/java/org/springframework/web/reactive/result/HandlerResultHandlerSupport.java

@@ -21,7 +21,6 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Optional;
 import java.util.Set;
 import java.util.function.Supplier;
 
@@ -150,12 +149,9 @@ public abstract class HandlerResultHandlerSupport implements Ordered {
 	private List<MediaType> getProducibleTypes(ServerWebExchange exchange,
 			Supplier<List<MediaType>> producibleTypesSupplier) {
 
-		Optional<Object> optional = exchange.getAttribute(HandlerMapping.PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE);
-		if (optional.isPresent()) {
-			Set<MediaType> set = (Set<MediaType>) optional.get();
-			return new ArrayList<>(set);
-		}
-		return producibleTypesSupplier.get();
+		return exchange.getAttribute(HandlerMapping.PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE)
+				.map(attribute -> (List<MediaType>) new ArrayList<>((Set<MediaType>) attribute))
+				.orElseGet(producibleTypesSupplier);
 	}
 
 	private MediaType selectMoreSpecificMediaType(MediaType acceptable, MediaType producible) {

spring-webflux/src/main/java/org/springframework/web/reactive/result/view/HttpMessageWriterView.java

@@ -20,7 +20,6 @@ import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
 
@@ -32,7 +31,6 @@ import org.springframework.core.codec.Encoder;
 import org.springframework.http.MediaType;
 import org.springframework.http.codec.EncoderHttpMessageWriter;
 import org.springframework.http.codec.HttpMessageWriter;
-import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.util.Assert;
 import org.springframework.web.server.ServerWebExchange;
 
@@ -116,25 +114,26 @@ public class HttpMessageWriterView implements View {
 	@Override
 	@SuppressWarnings("unchecked")
 	public Mono<Void> render(Map<String, ?> model, MediaType contentType, ServerWebExchange exchange) {
-		return getObjectToRender(model)
-				.map(value -> write(value, contentType, exchange))
-				.orElseGet(() -> exchange.getResponse().setComplete());
+		Object value = getObjectToRender(model);
+		return (value != null) ?
+				write(value, contentType, exchange) :
+				exchange.getResponse().setComplete();
 	}
 
-	private Optional<Object> getObjectToRender(Map<String, ?> model) {
+	private Object getObjectToRender(Map<String, ?> model) {
 
 		Map<String, ?> result = model.entrySet().stream()
 				.filter(this::isMatch)
 				.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
 
 		if (result.isEmpty()) {
-			return Optional.empty();
+			return null;
 		}
 		else if (result.size() == 1) {
-			return Optional.of(result.values().iterator().next());
+			return result.values().iterator().next();
 		}
 		else if (this.canWriteMap) {
-			return Optional.of(result);
+			return result;
 		}
 		else {
 			throw new IllegalStateException("Multiple matches found: " + result + " but " +

spring-webflux/src/main/java/org/springframework/web/reactive/result/view/RequestContext.java

@@ -389,7 +389,7 @@ public class RequestContext {
 	protected <T> T getModelObject(String modelName) {
 		T modelObject = (T) this.model.get(modelName);
 		if (modelObject == null) {
-			modelObject = (T) this.exchange.getAttribute(modelName);
+			modelObject = (T) this.exchange.getAttribute(modelName).orElse(null);
 		}
 		return modelObject;
 	}

spring-webflux/src/main/java/org/springframework/web/reactive/result/view/freemarker/FreeMarkerView.java

@@ -42,6 +42,7 @@ import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.context.ApplicationContextException;
 import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.http.MediaType;
+import org.springframework.util.MimeType;
 import org.springframework.web.reactive.result.view.AbstractUrlBasedView;
 import org.springframework.web.server.ServerWebExchange;
 
@@ -177,7 +178,7 @@ public class FreeMarkerView extends AbstractUrlBasedView {
 
 		DataBuffer dataBuffer = exchange.getResponse().bufferFactory().allocateBuffer();
 		try {
-			Charset charset = getCharset(contentType).orElse(getDefaultCharset());
+			Charset charset = getCharset(contentType);
 			Writer writer = new OutputStreamWriter(dataBuffer.asOutputStream(), charset);
 			getTemplate(locale).process(freeMarkerModel, writer);
 		}
@@ -191,8 +192,8 @@ public class FreeMarkerView extends AbstractUrlBasedView {
 		return exchange.getResponse().writeWith(Flux.just(dataBuffer));
 	}
 
-	private Optional<Charset> getCharset(MediaType mediaType) {
-		return (mediaType != null ? Optional.ofNullable(mediaType.getCharset()) : Optional.empty());
+	private Charset getCharset(MediaType mediaType) {
+		return Optional.ofNullable(mediaType).map(MimeType::getCharset).orElse(getDefaultCharset());
 	}
 
 	/**