Polish

spring-messaging/src/main/java/org/springframework/messaging/handler/AbstractMessageCondition.java

@@ -22,13 +22,30 @@ import java.util.Iterator;
 import org.springframework.lang.Nullable;
 
 /**
- * A base class for {@link MessageCondition} types providing implementations of
- * {@link #equals(Object)}, {@link #hashCode()}, and {@link #toString()}.
+ * Base class for {@code MessageCondition's} that pre-declares abstract methods
+ * {@link #getContent()} and {@link #getToStringInfix()} in order to provide
+ * implementations of {@link #equals(Object)}, {@link #hashCode()}, and
+ * {@link #toString()}.
  *
  * @author Rossen Stoyanchev
  * @since 4.0
  */
-public abstract class AbstractMessageCondition<T extends AbstractMessageCondition<T>> implements MessageCondition<T> {
+public abstract class AbstractMessageCondition<T extends AbstractMessageCondition<T>>
+		implements MessageCondition<T> {
+
+
+	/**
+	 * Return the collection of objects the message condition is composed of
+	 * (e.g. destination patterns), never {@code null}.
+	 */
+	protected abstract Collection<?> getContent();
+
+	/**
+	 * The notation to use when printing discrete items of content.
+	 * For example " || " for URL patterns or " && " for param expressions.
+	 */
+	protected abstract String getToStringInfix();
+
 
 	@Override
 	public boolean equals(@Nullable Object obj) {
@@ -61,17 +78,4 @@ public abstract class AbstractMessageCondition<T extends AbstractMessageConditio
 		return builder.toString();
 	}
 
-
-	/**
-	 * Return the collection of objects the message condition is composed of
-	 * (e.g. destination patterns), never {@code null}.
-	 */
-	protected abstract Collection<?> getContent();
-
-	/**
-	 * The notation to use when printing discrete items of content.
-	 * For example " || " for URL patterns or " && " for param expressions.
-	 */
-	protected abstract String getToStringInfix();
-
 }

spring-messaging/src/main/java/org/springframework/messaging/simp/SimpMessageTypeMessageCondition.java

@@ -16,8 +16,9 @@
 
 package org.springframework.messaging.simp;
 
-import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
 
 import org.springframework.lang.Nullable;
 import org.springframework.messaging.Message;
@@ -25,7 +26,8 @@ import org.springframework.messaging.handler.AbstractMessageCondition;
 import org.springframework.util.Assert;
 
 /**
- * A message condition that checks the message type.
+ * {@code MessageCondition} that matches by the message type obtained via
+ * {@link SimpMessageHeaderAccessor#getMessageType(Map)}.
  *
  * @author Rossen Stoyanchev
  * @since 4.0
@@ -58,7 +60,7 @@ public class SimpMessageTypeMessageCondition extends AbstractMessageCondition<Si
 
 	@Override
 	protected Collection<?> getContent() {
-		return Arrays.asList(this.messageType);
+		return Collections.singletonList(this.messageType);
 	}
 
 	@Override
@@ -80,15 +82,15 @@ public class SimpMessageTypeMessageCondition extends AbstractMessageCondition<Si
 
 	@Override
 	public int compareTo(SimpMessageTypeMessageCondition other, Message<?> message) {
-		Object actualMessageType = SimpMessageHeaderAccessor.getMessageType(message.getHeaders());
-		if (actualMessageType != null) {
-			if (actualMessageType.equals(this.getMessageType()) && actualMessageType.equals(other.getMessageType())) {
+		Object actual = SimpMessageHeaderAccessor.getMessageType(message.getHeaders());
+		if (actual != null) {
+			if (actual.equals(this.messageType) && actual.equals(other.getMessageType())) {
 				return 0;
 			}
-			else if (actualMessageType.equals(this.getMessageType())) {
+			else if (actual.equals(this.messageType)) {
 				return -1;
 			}
-			else if (actualMessageType.equals(other.getMessageType())) {
+			else if (actual.equals(other.getMessageType())) {
 				return 1;
 			}
 		}