Fix minor issue in StandardToWebSocketExtensionAdapter

This change ensures proper initialization of a WebSocketExtension
from a JSR-356 Extension.

This is in preparation for SPR-11094

spring-websocket/src/main/java/org/springframework/web/socket/adapter/standard/StandardToWebSocketExtensionAdapter.java

@@ -18,19 +18,35 @@ package org.springframework.web.socket.adapter.standard;
 
 import javax.websocket.Extension;
 
+import org.springframework.util.LinkedCaseInsensitiveMap;
 import org.springframework.web.socket.WebSocketExtension;
 
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
 /**
+ * A sub-class of {@link org.springframework.web.socket.WebSocketExtension} that
+ * can be constructed from an {@link javax.websocket.Extension}.
+ *
  * @author Rossen Stoyanchev
  * @since 4.0
  */
 public class StandardToWebSocketExtensionAdapter extends WebSocketExtension {
 
-	public StandardToWebSocketExtensionAdapter(Extension ext) {
-		super(ext.getName());
-		for (Extension.Parameter p : ext.getParameters()) {
-			super.getParameters().put(p.getName(), p.getValue());
+
+	public StandardToWebSocketExtensionAdapter(Extension extension) {
+		super(extension.getName(), initParameters(extension));
+	}
+
+
+	private static Map<String, String> initParameters(Extension extension) {
+		List<Extension.Parameter> parameters = extension.getParameters();
+		Map<String, String> result = new LinkedCaseInsensitiveMap<String>(parameters.size(), Locale.ENGLISH);
+		for (Extension.Parameter parameter : parameters) {
+			result.put(parameter.getName(), parameter.getValue());
 		}
+		return result;
 	}
 
 }

spring-websocket/src/main/java/org/springframework/web/socket/adapter/standard/WebSocketToStandardExtensionAdapter.java

@@ -23,6 +23,9 @@ import javax.websocket.Extension;
 import org.springframework.web.socket.WebSocketExtension;
 
 /**
+ * Adapt an instance of {@link org.springframework.web.socket.WebSocketExtension} to
+ * the {@link javax.websocket.Extension} interface.
+ *
  * @author Rossen Stoyanchev
  * @since 4.0
  */
@@ -32,9 +35,10 @@ public class WebSocketToStandardExtensionAdapter implements Extension {
 
 	private final List<Parameter> parameters = new ArrayList<Parameter>();
 
-	public WebSocketToStandardExtensionAdapter(final WebSocketExtension ext) {
-		this.name = ext.getName();
-		for (final String paramName : ext.getParameters().keySet()) {
+
+	public WebSocketToStandardExtensionAdapter(final WebSocketExtension extension) {
+		this.name = extension.getName();
+		for (final String paramName : extension.getParameters().keySet()) {
 			this.parameters.add(new Parameter() {
 				@Override
 				public String getName() {
@@ -42,7 +46,7 @@ public class WebSocketToStandardExtensionAdapter implements Extension {
 				}
 				@Override
 				public String getValue() {
-					return ext.getParameters().get(paramName);
+					return extension.getParameters().get(paramName);
 				}
 			});
 		}