Polishing

spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/DefaultStompSession.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -272,8 +272,7 @@ public class DefaultStompSession implements ConnectionHandlingStompSession {
 	}
 
 	private boolean isEmpty(@Nullable Object payload) {
-		return payload == null || StringUtils.isEmpty(payload) ||
-				(payload instanceof byte[] && ((byte[]) payload).length == 0);
+		return (StringUtils.isEmpty(payload) || (payload instanceof byte[] && ((byte[]) payload).length == 0));
 	}
 
 	private void execute(Message<byte[]> message) {
@@ -689,8 +688,10 @@ public class DefaultStompSession implements ConnectionHandlingStompSession {
 			if (conn != null) {
 				conn.send(HEARTBEAT).addCallback(
 						new ListenableFutureCallback<Void>() {
+							@Override
 							public void onSuccess(@Nullable Void result) {
 							}
+							@Override
 							public void onFailure(Throwable ex) {
 								handleFailure(ex);
 							}

spring-messaging/src/main/java/org/springframework/messaging/support/NativeMessageHeaderAccessor.java

@@ -82,7 +82,7 @@ public class NativeMessageHeaderAccessor extends MessageHeaderAccessor {
 
 
 	/**
-	 * Sub-classes can use this method to access the "native" headers sub-map.
+	 * Subclasses can use this method to access the "native" headers sub-map.
 	 */
 	@SuppressWarnings("unchecked")
 	@Nullable
@@ -139,6 +139,7 @@ public class NativeMessageHeaderAccessor extends MessageHeaderAccessor {
 
 	/**
 	 * Whether the native header map contains the give header name.
+	 * @param headerName the name of the header
 	 */
 	public boolean containsNativeHeader(String headerName) {
 		Map<String, List<String>> map = getNativeHeaders();
@@ -146,7 +147,9 @@ public class NativeMessageHeaderAccessor extends MessageHeaderAccessor {
 	}
 
 	/**
-	 * Return the values for the specified native header, if present.
+	 * Return all values for the specified native header, if present.
+	 * @param headerName the name of the header
+	 * @return the associated values, or {@code null} if none
 	 */
 	@Nullable
 	public List<String> getNativeHeader(String headerName) {
@@ -156,13 +159,15 @@ public class NativeMessageHeaderAccessor extends MessageHeaderAccessor {
 
 	/**
 	 * Return the first value for the specified native header, if present.
+	 * @param headerName the name of the header
+	 * @return the associated value, or {@code null} if none
 	 */
 	@Nullable
 	public String getFirstNativeHeader(String headerName) {
 		Map<String, List<String>> map = getNativeHeaders();
 		if (map != null) {
 			List<String> values = map.get(headerName);
-			if (values != null) {
+			if (!CollectionUtils.isEmpty(values)) {
 				return values.get(0);
 			}
 		}
@@ -200,6 +205,8 @@ public class NativeMessageHeaderAccessor extends MessageHeaderAccessor {
 	 * Add the specified native header value to existing values.
 	 * <p>In order for this to work, the accessor must be {@link #isMutable()
 	 * mutable}. See {@link MessageHeaderAccessor} for details.
+	 * @param name the name of the header
+	 * @param value the header value to set
 	 */
 	public void addNativeHeader(String name, @Nullable String value) {
 		Assert.state(isMutable(), "Already immutable");
@@ -216,6 +223,10 @@ public class NativeMessageHeaderAccessor extends MessageHeaderAccessor {
 		setModified(true);
 	}
 
+	/**
+	 * Add the specified native headers to existing values.
+	 * @param headers the headers to set
+	 */
 	public void addNativeHeaders(@Nullable MultiValueMap<String, String> headers) {
 		if (headers == null) {
 			return;
@@ -227,24 +238,34 @@ public class NativeMessageHeaderAccessor extends MessageHeaderAccessor {
 	 * Remove the specified native header value replacing existing values.
 	 * <p>In order for this to work, the accessor must be {@link #isMutable()
 	 * mutable}. See {@link MessageHeaderAccessor} for details.
+	 * @param headerName the name of the header
+	 * @return the associated values, or {@code null} if the header was not present
 	 */
 	@Nullable
-	public List<String> removeNativeHeader(String name) {
+	public List<String> removeNativeHeader(String headerName) {
 		Assert.state(isMutable(), "Already immutable");
 		Map<String, List<String>> nativeHeaders = getNativeHeaders();
-		if (nativeHeaders == null) {
+		if (CollectionUtils.isEmpty(nativeHeaders)) {
 			return null;
 		}
-		return nativeHeaders.remove(name);
+		return nativeHeaders.remove(headerName);
 	}
 
+
+	/**
+	 * Return the first value for the specified native header,
+	 * or {@code null} if none.
+	 * @param headerName the name of the header
+	 * @param headers the headers map to introspect
+	 * @return the associated value, or {@code null} if none
+	 */
 	@SuppressWarnings("unchecked")
 	@Nullable
 	public static String getFirstNativeHeader(String headerName, Map<String, Object> headers) {
 		Map<String, List<String>> map = (Map<String, List<String>>) headers.get(NATIVE_HEADERS);
 		if (map != null) {
 			List<String> values = map.get(headerName);
-			if (values != null) {
+			if (!CollectionUtils.isEmpty(values)) {
 				return values.get(0);
 			}
 		}

spring-web/src/main/java/org/springframework/http/ResponseCookie.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -185,7 +185,7 @@ public final class ResponseCookie extends HttpCookie {
 	 * with a name-value pair and may also include attributes.
 	 * @param name the cookie name
 	 * @param value the cookie value
-	 * @return the created cookie instance
+	 * @return a builder to create the cookie with
 	 */
 	public static ResponseCookieBuilder from(final String name, final String value) {
 

spring-web/src/main/java/org/springframework/http/client/reactive/JettyClientHttpRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -38,7 +38,6 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.MediaType;
 import org.springframework.lang.Nullable;
-import org.springframework.util.Assert;
 
 /**
  * {@link ClientHttpRequest} implementation for the Jetty ReactiveStreams HTTP client.
@@ -65,9 +64,7 @@ class JettyClientHttpRequest extends AbstractClientHttpRequest {
 
 	@Override
 	public HttpMethod getMethod() {
-		HttpMethod method = HttpMethod.resolve(this.jettyRequest.getMethod());
-		Assert.state(method != null, "Method must not be null");
-		return method;
+		return HttpMethod.valueOf(this.jettyRequest.getMethod());
 	}
 
 	@Override
@@ -119,7 +116,6 @@ class JettyClientHttpRequest extends AbstractClientHttpRequest {
 			public void succeeded() {
 				DataBufferUtils.release(buffer);
 			}
-
 			@Override
 			public void failed(Throwable x) {
 				DataBufferUtils.release(buffer);