Avoid collection lookups in StompCommand

Issue: SPR-14636
(cherry picked from commit 8e98177)

Author: jhoeller

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -16,79 +16,76 @@
 
 package org.springframework.messaging.simp.stomp;
 
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.Map;
-
 import org.springframework.messaging.simp.SimpMessageType;
 
 /**
  * Represents a STOMP command.
  *
  * @author Rossen Stoyanchev
+ * @author Juergen Hoeller
  * @since 4.0
  */
 public enum StompCommand {
 
 	// client
-	CONNECT,
-	STOMP,
-	DISCONNECT,
-	SUBSCRIBE,
-	UNSUBSCRIBE,
-	SEND,
-	ACK,
-	NACK,
-	BEGIN,
-	COMMIT,
-	ABORT,
+	STOMP(SimpMessageType.CONNECT),
+	CONNECT(SimpMessageType.CONNECT),
+	DISCONNECT(SimpMessageType.DISCONNECT),
+	SUBSCRIBE(SimpMessageType.SUBSCRIBE, true, true, false),
+	UNSUBSCRIBE(SimpMessageType.UNSUBSCRIBE, false, true, false),
+	SEND(SimpMessageType.MESSAGE, true, false, true),
+	ACK(SimpMessageType.OTHER),
+	NACK(SimpMessageType.OTHER),
+	BEGIN(SimpMessageType.OTHER),
+	COMMIT(SimpMessageType.OTHER),
+	ABORT(SimpMessageType.OTHER),
 
 	// server
-	CONNECTED,
-	MESSAGE,
-	RECEIPT,
-	ERROR;
-
-
-	private static Map<StompCommand, SimpMessageType> messageTypes = new HashMap<StompCommand, SimpMessageType>();
-	static {
-		messageTypes.put(StompCommand.CONNECT, SimpMessageType.CONNECT);
-		messageTypes.put(StompCommand.STOMP, SimpMessageType.CONNECT);
-		messageTypes.put(StompCommand.SEND, SimpMessageType.MESSAGE);
-		messageTypes.put(StompCommand.MESSAGE, SimpMessageType.MESSAGE);
-		messageTypes.put(StompCommand.SUBSCRIBE, SimpMessageType.SUBSCRIBE);
-		messageTypes.put(StompCommand.UNSUBSCRIBE, SimpMessageType.UNSUBSCRIBE);
-		messageTypes.put(StompCommand.DISCONNECT, SimpMessageType.DISCONNECT);
-	}
+	CONNECTED(SimpMessageType.OTHER),
+	RECEIPT(SimpMessageType.OTHER),
+	MESSAGE(SimpMessageType.MESSAGE, true, true, true),
+	ERROR(SimpMessageType.OTHER, false, false, true);
+
 
-	private static Collection<StompCommand> destinationRequired = Arrays.asList(SEND, SUBSCRIBE, MESSAGE);
-	private static Collection<StompCommand> subscriptionIdRequired = Arrays.asList(SUBSCRIBE, UNSUBSCRIBE, MESSAGE);
-	private static Collection<StompCommand> contentLengthRequired = Arrays.asList(SEND, MESSAGE, ERROR);
-	private static Collection<StompCommand> bodyAllowed = Arrays.asList(SEND, MESSAGE, ERROR);
+	private final SimpMessageType messageType;
 
+	private final boolean destination;
+
+	private final boolean subscriptionId;
+
+	private final boolean body;
+
+
+	StompCommand(SimpMessageType messageType) {
+		this(messageType, false, false, false);
+	}
+
+	StompCommand(SimpMessageType messageType, boolean destination, boolean subscriptionId, boolean body) {
+		this.messageType = messageType;
+		this.destination = destination;
+		this.subscriptionId = subscriptionId;
+		this.body = body;
+	}
 
 
 	public SimpMessageType getMessageType() {
-		SimpMessageType type = messageTypes.get(this);
-		return (type != null) ? type : SimpMessageType.OTHER;
+		return this.messageType;
 	}
 
 	public boolean requiresDestination() {
-		return destinationRequired.contains(this);
+		return this.destination;
 	}
 
 	public boolean requiresSubscriptionId() {
-		return subscriptionIdRequired.contains(this);
+		return this.subscriptionId;
 	}
 
 	public boolean requiresContentLength() {
-		return contentLengthRequired.contains(this);
+		return this.body;
 	}
 
 	public boolean isBodyAllowed() {
-		return bodyAllowed.contains(this);
+		return this.body;
 	}
 
 }
-

spring-messaging/src/test/java/org/springframework/messaging/simp/stomp/StompCommandTests.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2002-2016 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.messaging.simp.stomp;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.EnumMap;
+import java.util.Map;
+
+import org.junit.Test;
+
+import org.springframework.messaging.simp.SimpMessageType;
+
+import static org.junit.Assert.*;
+
+/**
+ * @author Juergen Hoeller
+ */
+public class StompCommandTests {
+
+	private static final Collection<StompCommand> destinationRequired =
+			Arrays.asList(StompCommand.SEND, StompCommand.SUBSCRIBE, StompCommand.MESSAGE);
+
+	private static final Collection<StompCommand> subscriptionIdRequired =
+			Arrays.asList(StompCommand.SUBSCRIBE, StompCommand.UNSUBSCRIBE, StompCommand.MESSAGE);
+
+	private static final Collection<StompCommand> contentLengthRequired =
+			Arrays.asList(StompCommand.SEND, StompCommand.MESSAGE, StompCommand.ERROR);
+
+	private static final Collection<StompCommand> bodyAllowed =
+			Arrays.asList(StompCommand.SEND, StompCommand.MESSAGE, StompCommand.ERROR);
+
+	private static final Map<StompCommand, SimpMessageType> messageTypes =
+			new EnumMap<>(StompCommand.class);
+
+	static {
+		messageTypes.put(StompCommand.STOMP, SimpMessageType.CONNECT);
+		messageTypes.put(StompCommand.CONNECT, SimpMessageType.CONNECT);
+		messageTypes.put(StompCommand.DISCONNECT, SimpMessageType.DISCONNECT);
+		messageTypes.put(StompCommand.SUBSCRIBE, SimpMessageType.SUBSCRIBE);
+		messageTypes.put(StompCommand.UNSUBSCRIBE, SimpMessageType.UNSUBSCRIBE);
+		messageTypes.put(StompCommand.SEND, SimpMessageType.MESSAGE);
+		messageTypes.put(StompCommand.MESSAGE, SimpMessageType.MESSAGE);
+	}
+
+
+	@Test
+	public void getMessageType() throws Exception {
+		for (StompCommand stompCommand : StompCommand.values()) {
+			SimpMessageType simp = messageTypes.get(stompCommand);
+			if (simp == null) {
+				simp = SimpMessageType.OTHER;
+			}
+			assertSame(simp, stompCommand.getMessageType());
+		}
+	}
+
+	@Test
+	public void requiresDestination() throws Exception {
+		for (StompCommand stompCommand : StompCommand.values()) {
+			assertEquals(destinationRequired.contains(stompCommand), stompCommand.requiresDestination());
+		}
+	}
+
+	@Test
+	public void requiresSubscriptionId() throws Exception {
+		for (StompCommand stompCommand : StompCommand.values()) {
+			assertEquals(subscriptionIdRequired.contains(stompCommand), stompCommand.requiresSubscriptionId());
+		}
+	}
+
+	@Test
+	public void requiresContentLength() throws Exception {
+		for (StompCommand stompCommand : StompCommand.values()) {
+			assertEquals(contentLengthRequired.contains(stompCommand), stompCommand.requiresContentLength());
+		}
+	}
+
+	@Test
+	public void isBodyAllowed() throws Exception {
+		for (StompCommand stompCommand : StompCommand.values()) {
+			assertEquals(bodyAllowed.contains(stompCommand), stompCommand.isBodyAllowed());
+		}
+	}
+
+}