Polishing

(cherry picked from commit 3767092)

spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java

@@ -213,8 +213,9 @@ final class HtmlUnitRequestBuilder implements RequestBuilder, Mergeable {
 
 	private void authType(MockHttpServletRequest request) {
 		String authorization = header("Authorization");
-		if (authorization != null) {
-			request.setAuthType(StringUtils.split(authorization, ": ")[0]);
+		String[] authSplit = StringUtils.split(authorization, ": ");
+		if (authSplit != null) {
+			request.setAuthType(authSplit[0]);
 		}
 	}
 
@@ -434,20 +435,19 @@ final class HtmlUnitRequestBuilder implements RequestBuilder, Mergeable {
 
 	@Override
 	public Object merge(Object parent) {
-		if (parent == null) {
-			return this;
-		}
+		if (parent instanceof RequestBuilder) {
 			if (parent instanceof MockHttpServletRequestBuilder) {
 				MockHttpServletRequestBuilder copiedParent = MockMvcRequestBuilders.get("/");
 				copiedParent.merge(parent);
 				this.parentBuilder = copiedParent;
-		} else if (parent instanceof RequestBuilder) {
+			}
+			else {
 				this.parentBuilder = (RequestBuilder) parent;
 			}
 			if (parent instanceof SmartRequestBuilder) {
 				this.parentPostProcessor = (SmartRequestBuilder) parent;
 			}
-
+		}
 		return this;
 	}
 

spring-tx/src/main/java/org/springframework/transaction/event/ApplicationListenerMethodTransactionalAdapter.java

@@ -32,10 +32,10 @@ import org.springframework.transaction.support.TransactionSynchronizationManager
  * an event to a {@link TransactionalEventListener} annotated method. Supports
  * the exact same features as any regular {@link EventListener} annotated method
  * but is aware of the transactional context of the event publisher.
- * <p>
- * Processing of {@link TransactionalEventListener} is enabled automatically when
- * Spring's transaction management is enabled. For other cases, registering a
- * bean of type {@link TransactionalEventListenerFactory} is required.
+ *
+ * <p>Processing of {@link TransactionalEventListener} is enabled automatically
+ * when Spring's transaction management is enabled. For other cases, registering
+ * a bean of type {@link TransactionalEventListenerFactory} is required.
  *
  * @author Stephane Nicoll
  * @author Juergen Hoeller
@@ -69,8 +69,11 @@ class ApplicationListenerMethodTransactionalAdapter extends ApplicationListenerM
 			}
 			processEvent(event);
 		}
-		else if (logger.isDebugEnabled()) {
-			logger.debug("No transaction is running - skipping " + event);
+		else {
+			// No transactional event execution at all
+			if (logger.isDebugEnabled()) {
+				logger.debug("No transaction is active - skipping " + event);
+			}
 		}
 	}
 

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

@@ -808,13 +808,14 @@ public class HttpHeaders implements MultiValueMap<String, String>, Serializable
 
 	/**
 	 * Set the (new) value of the {@code Host} header.
-	 * <p>If the given {@linkplain InetSocketAddress#getPort() port} is {@code 0}, the host header
-	 * will only contain the {@linkplain InetSocketAddress#getHostString() hostname}.
+	 * <p>If the given {@linkplain InetSocketAddress#getPort() port} is {@code 0},
+	 * the host header will only contain the
+	 * {@linkplain InetSocketAddress#getHostString() hostname}.
+	 * @since 5.0
 	 */
 	public void setHost(InetSocketAddress host) {
-		String value =
-				host.getPort() != 0 ? String.format("%s:%d", host.getHostString(), host.getPort()) :
-						host.getHostString();
+		String value = (host.getPort() != 0 ?
+				String.format("%s:%d", host.getHostString(), host.getPort()) : host.getHostString());
 		set(HOST, value);
 	}
 
@@ -822,6 +823,7 @@ public class HttpHeaders implements MultiValueMap<String, String>, Serializable
 	 * Return the value of the required {@code Host} header.
 	 * <p>If the header value does not contain a port, the returned
 	 * {@linkplain InetSocketAddress#getPort() port} will be {@code 0}.
+	 * @since 5.0
 	 */
 	public InetSocketAddress getHost() {
 		String value = getFirst(HOST);

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

@@ -56,8 +56,8 @@ public abstract class HttpRange {
 	public ResourceRegion toResourceRegion(Resource resource) {
 		// Don't try to determine contentLength on InputStreamResource - cannot be read afterwards...
 		// Note: custom InputStreamResource subclasses could provide a pre-calculated content length!
-		Assert.isTrue(InputStreamResource.class != resource.getClass(),
-				"Can't convert an InputStreamResource to a ResourceRegion");
+		Assert.isTrue(resource.getClass() != InputStreamResource.class,
+				"Cannot convert an InputStreamResource to a ResourceRegion");
 		try {
 			long contentLength = resource.contentLength();
 			Assert.isTrue(contentLength > 0, "Resource content length should be > 0");
@@ -163,12 +163,12 @@ public abstract class HttpRange {
 	}
 
 	/**
-	 * Convert each {@code HttpRange} into a {@code ResourceRegion},
-	 * selecting the appropriate segment of the given {@code Resource}
-	 * using the HTTP Range information.
+	 * Convert each {@code HttpRange} into a {@code ResourceRegion}, selecting the
+	 * appropriate segment of the given {@code Resource} using HTTP Range information.
 	 * @param ranges the list of ranges
 	 * @param resource the resource to select the regions from
 	 * @return the list of regions for the given resource
+	 * @since 4.3
 	 */
 	public static List<ResourceRegion> toResourceRegions(List<HttpRange> ranges, Resource resource) {
 		if (CollectionUtils.isEmpty(ranges)) {

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

@@ -114,11 +114,13 @@ public class MediaType extends MimeType implements Serializable {
 
 	/**
 	 * Public constant media type for {@code application/pdf}.
+	 * @since 4.3
 	 */
 	public final static MediaType APPLICATION_PDF;
 
 	/**
 	 * A String equivalent of {@link MediaType#APPLICATION_PDF}.
+	 * @since 4.3
 	 */
 	public final static String APPLICATION_PDF_VALUE = "application/pdf";
 
@@ -194,11 +196,13 @@ public class MediaType extends MimeType implements Serializable {
 
 	/**
 	 * Public constant media type for {@code text/markdown}.
+	 * @since 4.3
 	 */
 	public final static MediaType TEXT_MARKDOWN;
 
 	/**
 	 * A String equivalent of {@link MediaType#TEXT_MARKDOWN}.
+	 * @since 4.3
 	 */
 	public final static String TEXT_MARKDOWN_VALUE = "text/markdown";
 
@@ -296,6 +300,7 @@ public class MediaType extends MimeType implements Serializable {
 	 * @param other the other media type
 	 * @param charset the character set
 	 * @throws IllegalArgumentException if any of the parameters contain illegal characters
+	 * @since 4.3
 	 */
 	public MediaType(MediaType other, Charset charset) {
 		super(other, charset);

spring-websocket/src/main/java/org/springframework/web/socket/WebSocketExtension.java

@@ -118,11 +118,11 @@ public class WebSocketExtension {
 	public String toString() {
 		StringBuilder str = new StringBuilder();
 		str.append(this.name);
-		for (String param : parameters.keySet()) {
+		for (Map.Entry<String, String> entry : this.parameters.entrySet()) {
 			str.append(';');
-			str.append(param);
+			str.append(entry.getKey());
 			str.append('=');
-			str.append(this.parameters.get(param));
+			str.append(entry.getValue());
 		}
 		return str.toString();
 	}
@@ -136,16 +136,17 @@ public class WebSocketExtension {
 	 * @throws IllegalArgumentException if the string cannot be parsed
 	 */
 	public static List<WebSocketExtension> parseExtensions(String extensions) {
-		if (!StringUtils.hasText(extensions)) {
-			return Collections.emptyList();
-		}
-		else {
-			List<WebSocketExtension> result = new ArrayList<>();
-			for (String token : StringUtils.tokenizeToStringArray(extensions, ",")) {
+		if (StringUtils.hasText(extensions)) {
+			String[] tokens = StringUtils.tokenizeToStringArray(extensions, ",");
+			List<WebSocketExtension> result = new ArrayList<WebSocketExtension>(tokens.length);
+			for (String token : tokens) {
 				result.add(parseExtension(token));
 			}
 			return result;
 		}
+		else {
+			return Collections.emptyList();
+		}
 	}
 
 	private static WebSocketExtension parseExtension(String extension) {